Handy web tools, minus the hassle.

PDF Editor — Merge, Reorder, Rotate, Watermark, Number & Split

Edit a PDF in your browser: merge files, reorder, rotate or delete pages, add a watermark or page numbers, and split — all in one tool. Free, no upload.

JSON Formatter & Validator

Beautify, minify and validate JSON in your browser — separate input/output panes, pinpoint syntax errors by line and column, sort keys, and download.

QR Code Generator

Create a QR code for a URL, Wi-Fi network or contact — custom colors, a center logo, download as PNG or SVG. Free, in your browser.

Bulk Image Converter — Resize, Compress & Convert

Batch-resize, compress and convert many images at once (PNG, JPG, WebP) — set size and format, dial in quality or compress to a target file size (e.g. under 200 KB), download as a zip. Free, no upload.

Word & Character Counter

Count words, characters, sentences, lines and paragraphs live as you type — free and 100% in your browser.

Color Converter (HEX, RGB, HSL)

Convert colors between HEX, RGB, HSL, OKLCH and CMYK (with alpha), get the nearest CSS color name, paste any format or use sliders. Free, in your browser.

Password Generator

Generate strong random passwords or memorable word passphrases in your browser. Free, nothing sent anywhere.

Text Case Converter

Convert text to UPPERCASE, lowercase, Title, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case and more — all cases at once, no upload.

PDF

PDF Editor — Merge, Reorder, Rotate, Watermark, Number & Split

Edit a PDF in your browser: merge files, reorder, rotate or delete pages, add a watermark or page numbers, and split — all in one tool. Free, no upload.

Images to PDF

Combine JPG and PNG images into one PDF — drag to reorder, pick A4/Letter or fit-to-image, and set a margin. Free, no upload, in your browser.

PDF to Images

Convert PDF pages to PNG or JPG images — all pages or a page range, multiple pages as a zip. Free, no upload.

Extract Text from PDF

Pull all the selectable text out of a PDF, then copy it or download it as a .txt file. Free, no upload.

Compress PDF

Shrink a PDF by re-encoding its pages at a quality you choose — free, no upload, in your browser.

Image

Bulk Image Converter — Resize, Compress & Convert

Image Editor — Crop, Rotate, Filters & Effects

Edit an image in your browser: crop, rotate, flip, resize, adjust brightness/contrast/saturation, apply filters, add a border or watermark. Free, no upload.

Favicon Generator

Turn an image into a favicon.ico plus PWA/apple-touch PNGs, a site.webmanifest and the HTML snippet — free, no upload, in your browser.

Image to Base64

Convert an image to a Base64 Data URI with ready-to-paste HTML, CSS and Markdown — no upload, 100% in your browser.

Image Color Picker

Pick colours from an image and get its palette — click any pixel for its hex code. No upload, 100% in your browser.

Base64 to Image Converter

Paste a Base64 or data URI string, preview the decoded image instantly, and download it — runs 100% in your browser with nothing uploaded.

Average Color of an Image

Find the average color of any image as a hex and RGB swatch — runs 100% in your browser, no upload required.

Placeholder Image Generator

Generate a solid-color placeholder image with its dimensions as centered text and download it as a PNG — runs 100% in your browser with no upload.

Image to ASCII Art Converter

Turn any photo or logo into text-character ASCII art with an adjustable width — runs 100% in your browser, no upload required.

SVG to PNG Converter

Convert SVG markup or files to a crisp PNG — set an exact pixel size (or 1×–3× scale) and a transparent or solid background, then download. Runs 100% in your browser with no upload.

Image Color Counter

Count the number of unique colors in any image and list the most common ones — runs 100% in your browser, no upload.

EXIF Viewer & Metadata Remover

See the hidden EXIF metadata in a photo — camera, date, GPS — and download a clean copy with it removed. 100% in your browser, no upload.

YouTube Thumbnail Downloader

Grab the thumbnail image from any YouTube video in every resolution (HD, SD, HQ). Paste a URL or the video ID — free, no sign-up.

Text

Word & Character Counter

Count words, characters, sentences, lines and paragraphs live as you type — free and 100% in your browser.

Text Case Converter

Convert text to UPPERCASE, lowercase, Title, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case and more — all cases at once, no upload.

Slug Generator

Turn titles into clean URL slugs — choose hyphen or underscore, lowercase or original case, max length, stop-word stripping, and batch mode. Free, in-browser.

Lorem Ipsum Generator

Generate placeholder lorem ipsum by words, sentences or paragraphs — classic, hipster or corporate flavors, as plain text, HTML or Markdown. Free, in-browser.

Find & Replace Text

Find and replace text in bulk, with optional regex and case-insensitive matching. Free, private, in your browser.

Text Diff Checker

Compare two blocks of text line by line or word by word and highlight what was added or removed. Free, private, in your browser.

List Randomizer

Shuffle a list of lines into random order or pick one random item — runs 100% in your browser, nothing is uploaded.

Random Number Generator

Generate random integers between any min and max, with optional unique values — free and 100% in your browser, nothing uploaded.

Remove Line Breaks

Remove or replace line breaks in your text and join lines into one — runs 100% in your browser with no upload.

Reverse Text

Reverse any text by characters, words, or lines instantly — runs 100% in your browser with no upload.

Text Repeater

Repeat any text as many times as you want with a chosen separator — runs 100% in your browser, nothing is uploaded.

Word Frequency Counter

Count how often each word appears in your text and see a sorted frequency table — runs 100% in your browser with no upload.

Text Sorter

Sort lines of text alphabetically, numerically, by length, or randomly — runs 100% in your browser, nothing is uploaded.

Whitespace Cleaner

Clean up messy whitespace — trim lines, collapse spaces, drop blank lines, convert tabs, or strip all spaces — running 100% in your browser with no upload.

Dice Roller

Roll dice from standard notation like 2d6+3 and see every die and the total — free and 100% in your browser, nothing uploaded.

Word Wrap

Wrap text to a fixed line width, optionally hard-breaking overlong words, running 100% in your browser with no upload.

Remove Accents & Diacritics from Text

Strip accents and diacritics from any text (café → cafe, naïve → naive) — running 100% in your browser with no upload.

Palindrome Checker

Check whether a word, phrase, or sentence is a palindrome, with options to ignore case and punctuation — runs 100% in your browser with no upload.

String Similarity

Compare two strings to get their Levenshtein edit distance and a similarity percentage instantly — runs 100% in your browser with no upload.

Keyword Density Checker

Analyze your text to see the most frequent words with their count and density percentage — runs 100% in your browser with no upload.

Readability Score Checker

Check the Flesch Reading Ease and Flesch-Kincaid Grade Level of any English text, with live word, sentence, and syllable counts — runs 100% in your browser with no upload.

Remove Emoji from Text

Strip every emoji and pictographic symbol out of any text (hi 😀 there 🎉 → hi there) — running 100% in your browser with no upload.

Text to Speech

Turn text into spoken audio with your browser’s built-in voices — pick a voice, speed and pitch, and press play. 100% in your browser, no upload.

Word Cloud Generator

Turn text into a word cloud — the most frequent words appear largest. Download as PNG. 100% in your browser, no upload.

Developer

JSON Formatter & Validator

Beautify, minify and validate JSON in your browser — separate input/output panes, pinpoint syntax errors by line and column, sort keys, and download.

Base Encoder — Base64, Base32, Base58 & Base64URL

Encode and decode text with Base64, Base32, Base58 or Base64URL — pick the alphabet from a dropdown. Unicode-safe, free, 100% in your browser.

URL Encoder & Decoder

Percent-encode text for safe use in URLs, or decode an encoded URL back to readable text. Free, in your browser.

Hash Generator (MD5 & SHA)

Generate CRC32, MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text or file, instantly and privately in your browser.

ID Generator — UUID, NanoID, ULID, ObjectID & MAC

Generate UUID v4, UUID v7, NanoID, ULID, MongoDB ObjectID or MAC addresses in bulk — pick the type, set a count, copy. Includes a UUID validator. Free, in your browser.

JSON to CSV Converter

Convert a JSON array of objects to CSV, or CSV back to JSON — quoting handled correctly. Free, in your browser.

Password Generator

Generate strong random passwords or memorable word passphrases in your browser. Free, nothing sent anywhere.

JWT Decoder

Decode a JWT and verify HMAC (HS*) and RSA/ECDSA (RS/PS/ES) signatures in-browser — with your secret or a public key — plus a live expiry countdown. Token and keys never leave your device.

Unix Timestamp Converter

Convert Unix/epoch timestamps to human dates in any time zone, with a live epoch clock and ISO 8601, RFC 2822, date & millisecond formats. Free, in-browser.

QR Code Generator

Create a QR code for a URL, Wi-Fi network or contact — custom colors, a center logo, download as PNG or SVG. Free, in your browser.

Regex Tester

Test a regular expression against your text, highlight matches and groups, and preview a replace. Free, in your browser.

Markdown to HTML

Convert Markdown to clean HTML with a live preview and one-click copy. Free, safe, in your browser.

HTML Entity Encoder / Decoder

Encode text to HTML entities or decode entities back to text — named, decimal and hex. Free, in your browser.

JSON to Code — TypeScript, Go, Rust, Python & more

Paste JSON and generate type definitions in TypeScript, Go, Rust, Python, Java, Kotlin, Swift or C# — pick the language from a dropdown. Free, no upload.

Cron Expression Explainer

Translate any cron expression into plain English and preview the next run times — free, no upload, in your browser.

Text Encrypt & Decrypt (AES)

Encrypt and decrypt text with a password using AES-256-GCM — entirely in your browser, nothing is ever uploaded.

Text to Binary

Convert text to binary, hexadecimal, or decimal and back — instantly and privately, using UTF-8 so any character round-trips.

String Escape / Unescape

Escape text for source code (newlines, tabs, quotes, backslashes, \uXXXX) and unescape it back — instantly, in your browser.

URL Parser

Break a URL into protocol, host, port, path, fragment and a table of query parameters — instantly and privately.

HTTP Status Codes

A searchable reference of HTTP status codes — 200, 301, 404, 500 and more — with plain-language meanings. In your browser.

Bitwise Calculator (AND, OR, XOR, NOT, Shift)

Compute AND, OR, XOR, NOT and bit shifts on two 32-bit integers and see the result in decimal, hex and binary — runs 100% in your browser, no upload.

ASCII Table

Searchable ASCII table (codes 0–127) with decimal, hex, binary, and the character or control-code name — runs 100% in your browser with no upload.

CSV to Markdown Table

Convert CSV data into a clean GitHub-flavored Markdown table with header and delimiter options — runs 100% in your browser with no upload.

HTML to Text Converter (Strip HTML Tags)

Paste HTML and instantly get clean plain text with tags removed, entities decoded and line breaks preserved — runs 100% in your browser, nothing is uploaded.

Password Strength & Entropy Checker

Estimate a password's entropy in bits, get a Very weak to Very strong rating, and see which character sets it uses — runs 100% in your browser, nothing is uploaded.

Unicode Character Inspector

Break any text into its Unicode code points and see the U+ codepoint, decimal value, UTF-8 bytes, and HTML entity for every character — runs 100% in your browser with no upload.

HMAC Generator (SHA-256, SHA-1, SHA-512)

Generate an HMAC of any message with a secret key using SHA-256, SHA-1, or SHA-512 — output as hex, running 100% in your browser with nothing uploaded.

IP Subnet Calculator (IPv4 CIDR)

Enter an IPv4 CIDR like 192.168.1.10/24 and instantly get the network, broadcast, host range, subnet mask, wildcard mask, host counts and address class/type — runs 100% in your browser, no upload.

Line Numberer

Add sequential line numbers to any text with custom start, separator, and zero-padding — runs 100% in your browser with no upload.

MIME Type Lookup

Look up the MIME type for a file extension (and vice versa) from a searchable table of ~66 common web, document, image, audio, video, archive and font types — runs 100% in your browser with no upload.

Query String Builder

Build a properly URL-encoded query string from key/value pairs, with an optional base URL — runs 100% in your browser, nothing is uploaded.

UTM Builder — Campaign URL Tracking Link Generator

Build campaign tracking URLs with utm_source, utm_medium and utm_campaign tags in seconds — runs 100% in your browser, no upload, no sign-up.

Chmod Permission Calculator

Convert Unix file permissions between symbolic (rwxr-xr--) and octal (754) with a live checkbox grid — runs 100% in your browser with no upload.

JSON Diff

Compare two JSON documents and see every added, removed, and changed key with its full path — runs 100% in your browser with no upload.

Punycode Converter (IDN ⇆ xn--)

Convert internationalized domain names between Unicode and Punycode (the xn-- ASCII form) in both directions — runs 100% in your browser, no upload.

Hex Dump

Turn any text into an xxd-style hex dump with byte offsets, hex bytes, and an ASCII gutter — runs 100% in your browser with no upload.

JSON to XML Converter

Convert JSON into clean, indented XML with a live preview and one-click copy — runs 100% in your browser with no upload.

Data Extractor — Pull Emails, URLs & More from Text

Extract emails, URLs, phone numbers, hashtags, @mentions or IP addresses from any block of text, deduped and ready to copy — runs 100% in your browser, no upload.

Delimiter Converter

Convert tabular text between comma, tab, semicolon, pipe, and space delimiters with a live preview — runs 100% in your browser with no upload.

Meta Tags Generator

Generate SEO, Open Graph, and Twitter Card meta tags from your page title, description, URL, and image — runs 100% in your browser with no upload.

robots.txt Generator — Build a Crawler Rules File Online

Generate a valid robots.txt file with User-agent, Allow, Disallow, Crawl-delay and Sitemap directives — runs 100% in your browser, no upload, no sign-up.

SQL IN Clause Generator

Paste a list of values, one per line, and instantly build a SQL IN (...) clause with optional quoting and a column name — runs 100% in your browser with no upload.

CSV to SQL INSERT Generator

Paste CSV and instantly build SQL INSERT statements with a table name, header, and delimiter options — runs 100% in your browser with no upload.

.env to JSON Converter

Convert a .env file to JSON and back with two live, editable boxes — runs 100% in your browser with no upload.

Markdown Table of Contents Generator

Generate a nested Markdown table of contents with anchor links from your headings instantly — runs 100% in your browser with no upload.

Crontab Generator

Build a cron expression from simple presets and fields, with a plain-English summary of when it runs — 100% in your browser, no upload.

curl Command Builder

Build a ready-to-run curl command from a method, URL, headers and body — runs 100% in your browser, nothing is uploaded.

JWT Generator (HS256/384/512)

Create a signed HMAC JWT from a JSON payload and secret — runs 100% in your browser, nothing is uploaded.

JSON Flatten & Unflatten

Flatten nested JSON into dot/bracket key paths and rebuild it back, with a live two-way preview — runs 100% in your browser with no upload.

Two's Complement Converter (8/16/32-bit Binary & Hex)

Convert a signed integer to its two's complement binary and hex at 8, 16 or 32 bits, and decode binary back to signed decimal — runs 100% in your browser, no upload.

Gray Code Converter (Decimal ⇄ Binary ⇄ Gray Code)

Convert between decimal, binary and Gray code with instant three-way boxes — runs 100% in your browser, nothing is uploaded.

INI to JSON Converter

Convert INI config files into clean JSON with a live preview and one-click copy — runs 100% in your browser with no upload.

Resistor Color Code Calculator

Pick the color of each band on a 4- or 5-band resistor and instantly read its resistance in ohms plus tolerance — runs 100% in your browser with no upload.

CSS Minifier

Minify CSS to shrink file size — strips comments and whitespace and collapses rules, running 100% in your browser with no upload.

ISBN Validator (ISBN-10 & ISBN-13)

Check whether a book's ISBN-10 or ISBN-13 has a correct checksum and instantly see which standard it is — runs 100% in your browser, nothing is uploaded.

Luhn Checker & Check Digit Calculator

Validate a card, IMEI or account number with the Luhn checksum and compute its check digit — runs 100% in your browser, no upload.

BBCode to HTML Converter

Convert BBCode markup to clean HTML instantly — runs 100% in your browser with no upload and no sign-up.

JSONL to JSON Array Converter

Convert JSON Lines (NDJSON) to a pretty JSON array and back, two ways, live as you type — runs 100% in your browser with no upload.

Semver Checker & Version Comparator

Parse a semantic version into major, minor, patch, prerelease and build parts and compare two versions by precedence — runs 100% in your browser, nothing is uploaded.

YAML ⇄ JSON Converter

Convert YAML to JSON and JSON back to YAML, both directions, with clear error messages — 100% in your browser, no upload.

SQL Formatter & Beautifier

Format and beautify messy SQL with proper indentation and uppercase keywords, for MySQL, PostgreSQL, SQLite and more — 100% in your browser.

HTML Formatter & Minifier

Beautify HTML with clean indentation or minify it to a single compact line — script, style and pre content preserved — 100% in your browser.

XML Formatter

Beautify, minify or validate XML with proper indentation — paste, format, copy. 100% in your browser, no upload.

Barcode Generator

Generate Code 128, EAN-13, UPC-A and Code 39 barcodes and download them as PNG or SVG. 100% in your browser, no upload.

JavaScript Beautifier

Format and pretty-print minified or messy JavaScript and JSON with proper indentation. 100% in your browser, no upload.

Calculators

Aspect Ratio Calculator

Work out aspect ratios and resize dimensions — simplify a size to 16:9, or find the missing width or height. In your browser.

Percentage Calculator

Three quick percentage calculations — X% of a value, what percent one number is of another, and percentage change.

Age Calculator

Calculate your exact age in years, months and days from a date of birth — plus total days lived. Free, in your browser.

Date Difference Calculator

Find the time between two dates in days, weeks, months and years — instantly and privately, in your browser.

Discount Calculator

Calculate the sale price and amount saved after a percentage discount, or work out the discount percent from original and final prices — 100% in your browser, no upload.

GCD & LCM Calculator

Find the greatest common divisor and least common multiple of any list of integers instantly — runs 100% in your browser with no upload.

Prime Checker & Factorization

Instantly check whether a number is prime and see its prime factorization — runs 100% in your browser with no upload.

VAT Calculator

Add or remove a VAT, GST or sales-tax percentage to see the gross, net and tax amounts instantly — 100% in your browser, no upload.

Compound Interest Calculator

Estimate the future value and total interest of savings or an investment from a principal, annual rate, term and compounding frequency — 100% in your browser, no upload.

Fraction Simplifier

Reduce any fraction to lowest terms and see it as a decimal and a mixed number, or convert a decimal like 0.75 back to a fraction — calculated 100% in your browser with no upload.

Margin & Markup Calculator

Turn cost and revenue into profit, profit margin % and markup %, or work out the revenue needed to hit a target margin — 100% in your browser, no upload.

Statistics Calculator

Paste a list of numbers to instantly get count, sum, mean, median, mode, min, max, range, quartiles (Q1/Q3), IQR, variance, and standard deviation — runs 100% in your browser with no upload.

Factorial, Permutations & Combinations Calculator

Compute n!, nPr and nCr exactly for any size of number — runs 100% in your browser with no upload.

Quadratic Equation Solver

Solve any quadratic equation ax² + bx + c = 0 and get the roots, discriminant, and vertex — runs 100% in your browser with no upload.

ISO Week Number Calculator

Find the ISO 8601 week number, week-year, and day-of-year for any date — runs 100% in your browser with no upload.

Circle Calculator

Enter any one of a circle's radius, diameter, circumference, or area and instantly get the other three — runs 100% in your browser with no upload.

Pythagorean Theorem Calculator

Find the missing side of a right triangle from any two sides using the Pythagorean theorem — runs 100% in your browser with no upload.

Time Ago Calculator

Turn any date and time into a human relative phrase like "3 hours ago" or "in 2 days" — runs 100% in your browser with no upload.

Add or Subtract Days Calculator

Add or subtract days, weeks, months, or years from any date and see the resulting date and weekday — runs 100% in your browser with no upload.

Leap Year Checker

Instantly check whether any year is a leap year, see why, how many days it has, and the next leap years — runs 100% in your browser with no upload.

Slope Calculator (Two Points)

Find the slope, y-intercept, line equation y = mx + b, and angle from two points — runs 100% in your browser with no upload.

Business Days Calculator

Count the working days (Mon–Fri) and weekend days between two dates, inclusive of both endpoints — runs 100% in your browser with no upload.

Day of the Week Finder

Find out what day of the week any date falls on, plus its day-of-year and whether it is a weekend — runs 100% in your browser with no upload.

Distance & Midpoint Calculator

Calculate the straight-line distance and midpoint between two 2D points from their x and y coordinates — runs 100% in your browser with no upload.

Fibonacci Sequence Generator & Nth Term Calculator

Generate the first N Fibonacci numbers or find the exact Nth term with BigInt precision — runs 100% in your browser with no upload.

Proportion Calculator (a/b = c/d)

Solve a proportion a/b = c/d by entering any three values and leaving one blank — runs 100% in your browser with no upload.

Days in Month Calculator

Instantly find how many days are in any month of any year, with leap years handled automatically — runs 100% in your browser with no upload.

Ohm's Law Calculator

Enter any two of voltage, current, resistance, or power and this Ohm's law calculator instantly finds the other two — runs 100% in your browser with no upload.

Scientific Notation Converter

Convert any number to and from scientific and engineering notation instantly — runs 100% in your browser with no upload.

Zodiac Sign Finder

Find your Western star sign and Chinese zodiac animal from any birth date — runs 100% in your browser with no upload.

Golden Ratio Calculator (Phi 1.618)

Enter the longer, shorter, or whole segment and instantly get all golden-ratio (phi = 1.618) values — runs 100% in your browser with no upload.

Moon Phase Calculator

Find the moon phase and approximate illumination percentage for any date — runs 100% in your browser with no upload.

Weighted Average Calculator

Enter value and weight pairs to instantly compute a weighted average and total weight — runs 100% in your browser with nothing uploaded.

Logarithm Calculator (log any base, ln, log10)

Calculate the logarithm of any number in any base, plus natural log (ln) and log base 10 — runs 100% in your browser with no upload.

Nth Root Calculator

Calculate the square root, cube root, or any nth root of a number instantly — runs 100% in your browser with no upload.

Arithmetic Sequence Calculator

List every term, find the Nth term, and compute the sum of an arithmetic sequence from its first term and common difference — runs 100% in your browser with no upload.

Time Duration Calculator (Add & Subtract HH:MM:SS)

Add and subtract time durations in HH:MM:SS or MM:SS, one per line with optional + or −, and get the running total instantly — runs 100% in your browser with no upload.

Easter Date Calculator

Find the exact date of Western (Gregorian) Easter Sunday for any year using the Meeus/Jones/Butcher algorithm — runs 100% in your browser with no upload.

Geometric Sequence Calculator

List every term, find the Nth term, and compute the sum of a geometric sequence from its first term and common ratio — runs 100% in your browser with no upload.

Simple Interest Calculator

Estimate the interest and total amount on a principal from an annual rate and a term in years, months or days using the simple interest formula — 100% in your browser, no upload.

Time Card Calculator

Enter clock-in and clock-out times with optional break minutes to get decimal hours worked per day and a weekly total — 100% in your browser, no upload.

Julian Day Number Converter

Convert any Gregorian calendar date to its astronomical Julian Day Number and back, instantly — runs 100% in your browser with no upload.

Significant Figures Rounder

Round any number to a chosen number of significant figures instantly — runs 100% in your browser with no upload.

BMI Calculator

Calculate your Body Mass Index from height and weight in metric or imperial units, with your category and healthy weight range — 100% in your browser, no upload.

Loan & Mortgage Calculator

Calculate the monthly payment, total interest and a full amortization schedule for a fixed-rate loan or mortgage — 100% in your browser, no upload.

Tip Calculator

Work out the tip, total and per-person amount for any bill, with quick 10–25% presets and bill splitting — 100% in your browser, no upload.

Calorie Calculator (TDEE & BMR)

Estimate your daily calorie needs — BMR, maintenance (TDEE) and weight-loss or gain targets — using the Mifflin–St Jeor equation, 100% in your browser.

GPA Calculator

Calculate your weighted grade point average on the 4.0 scale from each course's letter grade and credit hours — 100% in your browser, no upload.

Salary Calculator — Hourly ↔ Annual Pay Converter

Convert pay between hourly, daily, weekly, monthly and annual — set your own hours per week and weeks per year. Free, instant and 100% in your browser.

Running Pace Calculator — min/km, min/mile & Finish Times

Enter a distance and time to get your pace per km and per mile, speed, and predicted 5K, 10K, half and full marathon finish times. Free, in your browser.

Grade Calculator — Test Score % and Final Grade Needed

Turn correct answers into a percentage and letter grade, or work out the score you need on the final to hit your target. Free, instant, in your browser.

Fuel Cost Calculator — Trip Gas & Petrol Cost

Estimate the fuel cost of a trip from distance, fuel economy and price — miles or km, mpg, L/100km or km/L — and split it between passengers. Free, in your browser.

Body Fat Calculator — U.S. Navy Method

Estimate your body fat percentage from tape measurements using the U.S. Navy circumference method — metric or imperial. Free, private, 100% in your browser.

Sleep Calculator — Bedtime & Wake-Up Time

Find the best time to sleep or wake based on 90-minute sleep cycles. Enter a time and get bedtime or wake-up suggestions. Free, in your browser.

Electricity Cost Calculator — Appliance Running Cost

Work out what an appliance costs to run per day, month and year from its wattage, hours of use and your electricity rate. Free, 100% in your browser.

Paint Calculator — How Much Paint You Need

Estimate how many gallons or litres of paint a room needs from wall size, doors, windows and coats. Metric or imperial, free, in your browser.

Concrete Calculator — Cubic Yards & Bags

Calculate concrete volume for a slab or footing in cubic yards, metres and feet, plus how many 40/60/80 lb bags you need. Free, in your browser.

Pregnancy Due Date Calculator (Naegele’s Rule)

Estimate your pregnancy due date from your last menstrual period, and see how many weeks along you are. An estimate, not medical advice. In your browser.

Square Footage Calculator — Area of a Room

Add up the square footage (and square metres) of one or more rooms, with an optional total cost per square foot. Free, in your browser.

Tile Calculator — Tiles & Boxes Needed

Work out how many tiles and boxes you need for a floor or wall from the area, tile size and a waste allowance. Metric or imperial, in your browser.

Ideal Weight Calculator (Devine, Robinson, Miller, Hamwi)

Estimate ideal body weight from height and sex using four classic clinical formulas, plus the healthy BMI weight range. Free, in your browser.

Unit Price Calculator — Cost Per Unit & Best Value

Compare products by price per unit to find the best value. Enter each option’s price and amount; the cheapest per unit is highlighted. In your browser.

Water Intake Calculator — Daily Water Needs

Estimate how much water to drink a day from your weight, exercise and climate — in litres, ounces and cups. A general guide, in your browser.

One-Rep Max (1RM) Calculator + Training Loads

Estimate your one-rep max from a weight and reps using the Epley and Brzycki formulas, with a percentage table of training loads. In your browser.

Dog Age Calculator — Dog Years to Human Years

Convert your dog’s age to human years using a size-adjusted model and the 2019 epigenetic-clock formula. Free, in your browser.

Converters

Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal or any base from 2 to 36 — even very large ones. Free, in your browser.

Roman Numeral Converter

Convert numbers to Roman numerals and back (1–3999) — instantly, in your browser, with malformed-numeral validation.

Unit Converter

Convert length, mass, temperature, data, speed, area, volume, pressure, energy, power, force, frequency and angle units — metric and imperial, in your browser.

Number to Words Converter

Convert any number into spelled-out words in English or Korean, from zero to the billions and beyond — runs 100% in your browser with no upload.

Time Zone Converter

Convert a date and time from one time zone to another with the live UTC offset — runs 100% in your browser with no upload.

Cooking Measurement Converter

Convert recipe amounts between US and metric cups, tablespoons, teaspoons, millilitres and fluid ounces instantly — runs 100% in your browser with no upload.

Fuel Economy Converter

Convert fuel economy between US MPG, UK MPG, km/L and L/100km instantly — runs 100% in your browser with no upload.

Color

Color Converter (HEX, RGB, HSL)

Convert colors between HEX, RGB, HSL, OKLCH and CMYK (with alpha), get the nearest CSS color name, paste any format or use sliders. Free, in your browser.

Color Contrast Checker (WCAG)

Check color contrast against WCAG AA and AAA for accessible text — live ratio, pass/fail badges and a preview, in your browser.

Color Shades & Tints Generator

Generate a palette of tints and shades from any hex color and copy each swatch instantly — runs 100% in your browser with no upload.

Color Mixer — Blend Two Hex Colors

Mix two hex colors by an adjustable ratio and copy the resulting hex plus a live swatch — runs 100% in your browser with no upload.

Color Scheme Generator

Generate complementary, triadic, analogous, and tetradic color schemes from any hex color and copy each swatch instantly — runs 100% in your browser with no upload.

Random Color Palette Generator

Generate a random, harmonious 5-color palette with one click and copy any hex code instantly — runs 100% in your browser with no upload.

CSS & Design

CSS Gradient Generator

Build linear, radial and conic CSS gradients with multiple colour stops, a live preview and copy-paste code — free, no upload, in your browser.

CSS Box Shadow Generator

Create CSS box-shadow with live preview — offset, blur, spread, colour, opacity and inset — copy the code, in your browser.

CSS Border Radius Generator

Round corners visually — per-corner sliders, px or %, live preview and copy-paste CSS. Free, no upload, in your browser.

CSS clamp() Generator for Fluid Typography

Generate a responsive CSS clamp() for fluid font sizes and spacing from min/max size and viewport values — runs 100% in your browser, no upload.

CSS Filter Generator

Build a CSS filter value with live-preview sliders for blur, brightness, contrast, grayscale, sepia, saturate, hue-rotate, and invert, then copy the code — runs 100% in your browser with no upload.

CSS text-shadow Generator with Live Preview

Generate a CSS text-shadow with sliders for offset, blur, color and opacity, and copy the ready-to-paste declaration — runs 100% in your browser, no upload.

CSS Triangle Generator with Live Preview

Generate pure-CSS triangles using the border trick — pick a direction, width, height and color, see a live preview, and copy the CSS. Runs 100% in your browser, no upload.

Glassmorphism CSS Generator

Design a frosted-glass (glassmorphism) card with live-preview sliders for blur, transparency, tint color, corner radius and border, then copy the ready CSS — runs 100% in your browser with no upload.

Neumorphism CSS Generator with Live Preview

Generate soft-UI (neumorphism) CSS with a live preview — pick a base color, size, radius, distance, blur, intensity and shape, then copy the dual box-shadow code. Runs 100% in your browser, no upload.

CSS Flexbox Generator with Live Preview

Build a CSS flexbox container with dropdowns for flex-direction, justify-content, align-items, flex-wrap and gap, watch a live preview update, and copy the ready CSS — runs 100% in your browser with no upload.

CSS Transform Generator

Build a CSS transform from translate, rotate, scale, and skew sliders with a live preview and copyable code — runs 100% in your browser with no upload.

CSS Transition Generator

Build a CSS transition shorthand from a property, duration, timing function, and delay, with a live hover preview — runs 100% in your browser with no upload.

CSS Media Query Generator

Generate responsive CSS @media queries from min-width, max-width, orientation, and device presets — runs 100% in your browser with no upload.

PX to REM & EM Converter

Convert between px, rem and em for any base font size and see all three equivalents instantly — runs 100% in your browser with no upload.

CSS Line-Clamp Generator (Truncate Text to N Lines)

Generate the CSS to truncate text to a set number of lines with an ellipsis using -webkit-line-clamp, with a live preview — runs 100% in your browser, no upload.

CSS Text Stroke (Outline) Generator with Live Preview

Generate a CSS text outline with -webkit-text-stroke using width, stroke color and fill color, with a live preview and copyable code — runs 100% in your browser, no upload.

CSS Grid Generator

Visually build a CSS grid — size each column and row track (fr / px / auto / minmax), set the gap and alignment, see a live preview, and copy the CSS. 100% in your browser.

Fun & Text Art

Morse Code Translator

Translate text to Morse code and back — instantly and privately in your browser, with letters, numbers and punctuation.

Cipher — Caesar, ROT13, ROT47, Atbash & Vigenère

Encode and decode text with classic ciphers — Caesar (any shift), ROT13, ROT47, Atbash and Vigenère (with a keyword). Free, private, 100% in your browser.

NATO Phonetic Alphabet Converter

Convert any text into the NATO phonetic alphabet (Alpha, Bravo, Charlie…) so you can spell it out clearly over the phone or radio — runs 100% in your browser, no upload.

Leetspeak (l33t) Translator

Convert any text to leetspeak and back — a4 e3 i1 o0 s5 t7 and more — running 100% in your browser with no upload.

Pig Latin Translator

Translate English text to Pig Latin instantly, running 100% in your browser with no upload and no sign-up.

Clap Text Generator

Add 👏 clap 👏 emojis 👏 between 👏 words to make meme text — runs 100% in your browser with no upload.

Mocking Case (SpongeBob) Text Generator

Turn any text into aLtErNaTiNg mocking SpongeBob case for memes and sarcastic replies — runs 100% in your browser with no upload.

Fancy Text Generator — Bold, Cursive, Bubble & more

Turn text into fancy Unicode fonts — bold, italic, cursive, bubble, monospace, small caps, strikethrough, upside-down, zalgo, all at once. Copy anywhere.