free · no sign-up · nothing uploaded
Tools that run in your browser
A shelf of small utilities, each doing one thing properly. No account, no file upload, no waiting — the work happens on your device and the result appears before you lift your finger.
32tools
8categories
0uploaded
2languages
Text
All 7 →01Word CounterLive word count, character count, sentences, paragraphs and reading time. Useful for essays, meta descriptions and social posts.→02Case ConverterConvert text between upper case, lower case, title case, sentence case, camelCase, snake_case, kebab-case and URL slugs.→03Lorem IpsumGenerate placeholder paragraphs of lorem ipsum for mock-ups and layout tests, with optional HTML paragraph tags.→04Remove Duplicate LinesPaste a list and strip repeated lines in one click. Keeps the original order, or sorts and de-duplicates at once. Nothing is uploaded.→05Sort LinesSort a list alphabetically, numerically, by length or reverse it. Optional case-insensitive and de-duplicate switches. Works locally.→06Reverse TextFlip a string backwards by character, reverse the word order in each line, or invert the line order. Handy for puzzles and data checks.→07Find and ReplaceReplace every occurrence of a string, or use a regular expression for pattern matching. Shows how many replacements were made.→
Developer
All 6 →01JSON FormatterFormat, indent, minify and validate JSON in your browser. Errors are reported with the parser's own message. Nothing is uploaded.→02Base64 EncoderEncode text to Base64 or decode it back, with correct UTF-8 handling for accents, CJK and emoji. Runs entirely in the browser.→03URL EncoderPercent-encode or decode URLs and query strings, showing the difference between encodeURI and encodeURIComponent.→04JWT DecoderPaste a JSON Web Token to read its header and payload as JSON, with the expiry date translated into plain UTC time. Nothing is sent anywhere.→05HTML Entity ConverterEscape the five characters that break HTML, or turn existing entities back into plain text. Useful when embedding user text in a template.→06Regex TesterType a pattern, paste sample text, and see every match highlighted with its capture groups and offsets. Runs in your browser, no round trip.→
Convert
All 5 →01Colour ConverterConvert colours between HEX, RGB and HSL with a live swatch and a light/dark contrast hint. Useful for design tokens and CSS.→02Unit ConverterConvert between metric and imperial units for length, mass, temperature, area, volume and speed, with exact factors.→03Number Base ConverterTurn a number between binary, octal, decimal and hexadecimal at once. Handles arbitrarily large integers without losing precision.→04Roman Numeral ConverterConvert 1–3999 into Roman numerals, or read a Roman numeral back as a number. Rejects malformed strings instead of guessing.→05CSV to JSON ConverterTurn comma or tab separated data into a JSON array of objects. Handles quoted fields, embedded commas and escaped quotes.→
Security
All 3 →01Password GeneratorGenerate passwords with the browser's cryptographic random generator and a real entropy estimate. Nothing is transmitted or stored.→02Hash GeneratorCompute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or a file with the Web Crypto API. Nothing is uploaded.→03UUID GeneratorCreate random version-4 UUIDs using the browser's cryptographic random source. Choose how many, uppercase or without hyphens.→
Images
All 3 →01Image CompressorShrink JPG, PNG and WebP images in your browser. Set a maximum width and quality, then download. Photos are never uploaded.→02Image ResizerDrag in a photo, set the width and height, and download the resized version. The file never leaves your device.→03Image to Base64Turn a small image into a data URI you can paste into CSS or HTML. Shows exactly how much bigger the encoded string is.→
Calculators
All 4 →01Percentage CalculatorWork out a percentage of a number, what percentage one number is of another, and the percentage change between two values.→02BMI CalculatorCalculate body mass index from height and weight, see the WHO category, and find the weight range that would put you in the normal band.→03Loan CalculatorWork out the monthly payment on a fixed-rate loan, plus total interest and a year-by-year amortisation schedule.→04Age CalculatorFind your exact age in years, months and days, plus the total number of days lived and how long until your next birthday.→
Date & time
All 2 →Web
All 2 →No tool matches that. Try “json”, “image”, “time”…
Why these are fast
There is no server doing the work. Formatting JSON, resizing an image or hashing a string happens inside your browser using the same APIs native web apps rely on. Results appear instantly, and nothing you paste, drop or select is transmitted anywhere.
Built for one job at a time
Each tool covers a single task properly rather than ten badly: paste messy JSON and get it validated and indented, drop a 4 MB photo and get a 300 KB version, generate a password with a real entropy figure instead of a cosmetic strength bar.