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132+ useful tools

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Explore Tool Categories

Four tidy collections make it easy to reach the right tool without digging through a cluttered directory.

Text Tools

Write, clean, inspect and transform text without sending it to a server.

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Developer Tools

Format, encode, validate and convert common developer data formats.

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Image Tools

Resize, convert and enhance images privately with browser-based canvas processing.

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Calculators & Utilities

Practical calculators, converters and generators for everyday decisions.

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Complete directory

Browse every free online tool

Search by name or filter the collection by category. Every published tool includes clear instructions and helpful context.

Word Counter

Count words and see characters, sentences, paragraphs and estimated reading time.

Character Counter

Measure characters both with and without spaces for precise length limits.

Sentence Counter

Estimate sentence totals and average sentence length in a passage.

Paragraph Counter

Count non-empty paragraphs and inspect the structure of longer writing.

Reading Time Calculator

Estimate silent reading and speaking time from a text sample.

Case Converter

Switch text among upper, lower, title, sentence, alternating and inverse case.

Uppercase Converter

Turn every supported letter into uppercase while preserving layout.

Lowercase Converter

Normalize capital letters to lowercase without disturbing punctuation or spacing.

Title Case Converter

Capitalize headings with sensible handling for common short words.

Sentence Case Converter

Capitalize the start of sentences while lowering accidental internal capitals.

Remove Duplicate Lines

Keep the first occurrence of each line and remove repeated entries.

Sort Lines

Arrange lines alphabetically, naturally, by length or in reverse order.

Reverse Text

Reverse the character order of text with Unicode-aware handling.

Reverse Word Order

Flip the order of words while keeping each individual word readable.

Trim Whitespace

Remove spaces and tabs from the beginning and end of every line.

Remove Extra Spaces

Collapse repeated horizontal whitespace while retaining paragraph breaks.

Line Break Remover

Join wrapped lines with spaces or remove breaks completely.

Find and Replace

Replace every literal or regular-expression match in a block of text.

Text Difference Checker

Compare two passages line by line and label additions, removals and unchanged lines.

Slug Generator

Create clean lowercase URL slugs from titles and phrases.

Keyword Density Checker

Measure how often a word or phrase appears relative to the passage length.

Word Frequency Counter

Rank repeated words and view their counts and share of the text.

Alphabetize Words

Sort individual words alphabetically with optional duplicate removal.

Email Address Extractor

Extract and deduplicate syntactically valid email addresses from pasted text.

URL Extractor

Find HTTP and HTTPS links inside prose, logs or markup.

Number Extractor

Pull signed integers and decimal values from mixed text.

Text to Binary Converter

Encode UTF-8 text as space-separated eight-bit binary bytes.

Binary to Text Converter

Decode eight-bit binary byte groups into readable UTF-8 text.

Morse Code Translator

Translate letters, digits and common punctuation to or from International Morse code.

NATO Phonetic Alphabet Translator

Spell letters and digits with standard NATO phonetic code words.

Text Repeater

Repeat a phrase a controlled number of times with a chosen separator.

JSON Formatter

Validate and pretty-print JSON with selectable indentation.

Developer Tools

Image Resizer

Resize an image to exact pixel dimensions with optional aspect-ratio locking.

Image Cropper

Crop a precise rectangular region using pixel coordinates and dimensions.

Image Compressor

Reduce JPEG or WebP file size with an adjustable quality setting.

Image to JPG Converter

Convert common browser-readable images to JPEG with a chosen background and quality.

Image to PNG Converter

Convert a browser-readable image into lossless PNG while retaining transparency.

Image to WebP Converter

Convert an image to compact WebP with configurable quality.

Rotate Image

Rotate an image by any angle while expanding the canvas to avoid clipping.

Flip Image Horizontally

Mirror an image from left to right without changing its dimensions.

Flip Image Vertically

Invert an image from top to bottom while keeping the original size.

Grayscale Image

Convert image colors to luminance-aware shades of gray.

Sepia Image Filter

Apply a warm sepia tone with an adjustable effect strength.

Invert Image Colors

Replace each RGB channel with its exact color negative.

Image Brightness Adjuster

Lighten or darken pixels by a controlled brightness percentage.

Image Contrast Adjuster

Increase or reduce the difference between dark and light image values.

Image Saturation Adjuster

Reduce or intensify image colorfulness while retaining luminance detail.

Blur Image

Apply a configurable Gaussian-style canvas blur to an image.

Sharpen Image

Increase local edge contrast with an adjustable sharpening convolution.

Pixelate Image

Create a blocky mosaic by downscaling and redrawing without smoothing.

Image Watermark Tool

Overlay custom text with adjustable position, size, color and opacity.

Add Border to Image

Add a solid border outside an image with exact width and color.

Round Image Corners

Clip image corners to a smooth adjustable radius with transparent outside pixels.

Circle Crop Image

Crop the centered square portion of an image into a transparent circle.

Image File Inspector

Inspect local image name, MIME type, bytes, pixel dimensions and aspect ratio.

Image Color Picker

Click a preview pixel to read its HEX, RGB and alpha values.

Dominant Image Color

Estimate the most common visible color family and a small palette.

Image to Base64

Read an image locally and produce a complete Base64 data URL.

Base64 to Image

Validate a Base64 image data URL, preview it and download the decoded file.

Favicon Generator

Fit an image into a square favicon canvas at common pixel sizes.

Percentage Calculator

Calculate what percentage one value is of another or find a percentage of a value.

Calculators & Utilities

Percentage Change Calculator

Measure relative increase or decrease from an old value to a new value.

Calculators & Utilities

Age Calculator

Calculate calendar age in years, months and days plus total elapsed days.

Calculators & Utilities

BMI Calculator

Calculate adult body mass index from metric or US customary measurements.

Calculators & Utilities

Loan EMI Calculator

Estimate fixed monthly loan payment, total repayment and total interest.

Calculators & Utilities

Compound Interest Calculator

Project principal growth with selectable compounding and regular contributions.

Calculators & Utilities

Simple Interest Calculator

Calculate non-compounding interest from principal, annual rate and time.

Calculators & Utilities

Discount Calculator

Find sale price, amount saved and optional tax after a percentage discount.

Calculators & Utilities

Tip Calculator

Calculate a tip, grand total and equal amount per person.

Calculators & Utilities

Sales Tax Calculator

Add tax to a net price or extract included tax from a gross price.

Calculators & Utilities

Length Converter

Convert lengths among metric, imperial and nautical units.

Calculators & Utilities

Weight and Mass Converter

Convert mass among milligrams, grams, kilograms, ounces, pounds and tonnes.

Calculators & Utilities

Temperature Converter

Convert temperatures among Celsius, Fahrenheit and Kelvin.

Calculators & Utilities

Data Storage Converter

Convert decimal SI and binary IEC data-size units without mixing their bases.

Calculators & Utilities

Speed Converter

Convert speed among metres per second, kilometres per hour, miles per hour and knots.

Calculators & Utilities

Time Unit Converter

Convert durations among milliseconds, seconds, minutes, hours, days and weeks.

Calculators & Utilities

Area Converter

Convert areas among square metric units, acres, hectares and square feet.

Calculators & Utilities

Volume Converter

Convert volume among metric litres, cubic units and US liquid measures.

Calculators & Utilities

Fuel Economy Converter

Convert between litres per 100 km, kilometres per litre and US miles per gallon.

Calculators & Utilities

Date Difference Calculator

Find elapsed days and calendar years, months and days between two dates.

Calculators & Utilities

Business Days Calculator

Count weekdays between dates and optionally exclude listed holidays.

Calculators & Utilities

Countdown Calculator

Measure the exact days, hours, minutes and seconds until a local date and time.

Calculators & Utilities

Random Number Generator

Generate unbiased random integers in an inclusive range with optional uniqueness.

Calculators & Utilities

Secure Password Generator

Generate cryptographically random passwords from selected character groups.

Calculators & Utilities

Dice Roller

Roll multiple fair virtual dice with configurable sides and a signed modifier.

Calculators & Utilities

Coin Flipper

Flip one or many virtual coins and summarize heads and tails.

Calculators & Utilities

Weighted Grade Calculator

Calculate a weighted average from score and weight pairs.

Calculators & Utilities

Electricity Cost Calculator

Estimate energy use and cost from appliance power, usage time and tariff.

Calculators & Utilities

Running Pace Calculator

Calculate pace and speed from distance and elapsed hours, minutes and seconds.

Calculators & Utilities

Aspect Ratio Calculator

Reduce width and height to a ratio and calculate a matching missing dimension.

Calculators & Utilities

Proportion Calculator

Solve one missing value in the proportion a:b = c:d.

Calculators & Utilities

Average and Statistics Calculator

Calculate count, sum, mean, median, minimum, maximum and population standard deviation.

Calculators & Utilities

GCD and LCM Calculator

Find the greatest common divisor and least common multiple of multiple integers.

Calculators & Utilities

Fraction Calculator

Add, subtract, multiply or divide two fractions and reduce the result.

Calculators & Utilities

Roman Numeral Converter

Convert integers from 1 to 3999 to canonical Roman numerals and back.

Calculators & Utilities

Prime Number Checker

Test whether a non-negative safe integer is prime and show a factor when composite.

Calculators & Utilities

Quadratic Equation Solver

Solve ax^2 + bx + c = 0 and report real or complex roots.

Calculators & Utilities

Circle Calculator

Calculate radius, diameter, circumference and area from any one circle measurement.

Calculators & Utilities

Ohm's Law Calculator

Solve voltage, current, resistance and electrical power from any two independent values.

Calculators & Utilities

Work Hours Calculator

Calculate paid time from start, end and unpaid break across midnight.

Calculators & Utilities

Timezone Offset Converter

Convert a date and time between explicit fixed UTC offsets.

Calculators & Utilities

JSON Minifier

Validate JSON and remove insignificant formatting whitespace.

Developer Tools

JSON Validator

Check JSON syntax and summarize the parsed top-level value.

Developer Tools

JSON to CSV Converter

Convert an array of flat JSON objects into escaped CSV rows.

Developer Tools

CSV to JSON Converter

Parse quoted CSV records into an array of keyed JSON objects.

Developer Tools

Base64 Encoder

Encode Unicode text as standard Base64 using UTF-8 bytes.

Developer Tools

Base64 Decoder

Validate and decode standard Base64 into UTF-8 text.

Developer Tools

URL Encoder

Percent-encode text safely for use as a URL component.

Developer Tools

URL Decoder

Decode percent-escaped URL components back to readable Unicode text.

Developer Tools

HTML Entity Encoder

Escape HTML-sensitive characters so text displays literally in markup.

Developer Tools

HTML Entity Decoder

Convert named and numeric HTML character references into readable text.

Developer Tools

HTML Minifier

Remove comments and collapse safe inter-tag whitespace in HTML snippets.

Developer Tools

CSS Minifier

Compact CSS comments and unnecessary whitespace with string-aware parsing.

Developer Tools

JavaScript Whitespace Minifier

Conservatively trim indentation and blank space without rewriting JavaScript tokens.

Developer Tools

SQL Formatter

Add readable line breaks and indentation to common SQL statements.

Developer Tools

XML Formatter

Validate XML and indent elements into a readable hierarchy.

Developer Tools

XML Minifier

Validate XML and remove whitespace that appears only between tags.

Developer Tools

HEX to RGB Converter

Convert three-, four-, six- or eight-digit hexadecimal colors to RGB or RGBA.

Developer Tools

RGB to HEX Converter

Convert decimal red, green, blue and optional alpha channels to hexadecimal.

Developer Tools

UUID v4 Generator

Generate cryptographically random RFC 4122 version 4 identifiers.

Developer Tools

Random HEX Generator

Create cryptographically random hexadecimal strings of an exact byte length.

Developer Tools

Hash Generator

Calculate SHA-1, SHA-256, SHA-384 or SHA-512 digests for text.

Developer Tools

HMAC Generator

Create a keyed SHA-256, SHA-384 or SHA-512 message authentication code.

Developer Tools

Unix Timestamp Converter

Convert Unix seconds or milliseconds to a date, or a date back to Unix time.

Developer Tools

Regular Expression Tester

Test a JavaScript regular expression and list every match with its position.

Developer Tools

JWT Decoder

Decode JWT header and payload JSON locally without claiming signature validity.

Developer Tools

Query String Parser

Parse URL query parameters into readable JSON while preserving repeated keys.

Developer Tools

Color Contrast Checker

Calculate WCAG contrast ratio and common AA or AAA text thresholds.

Developer Tools

Number Base Converter

Convert whole numbers among binary, octal, decimal and hexadecimal.

Developer Tools

Cron Expression Explainer

Validate and explain standard five-field cron timing expressions.

Developer Tools

CSS PX-REM Converter

Convert CSS pixel and rem measurements using an adjustable root size.

Developer Tools

Text Data URI Generator

Create a percent-encoded or Base64 data URI from text content.

Developer Tools