Tools
Instant browser tools — no install needed. Everything runs locally, in your browser.
All tools run entirely in your browser. What you type never leaves this device.
44 tools
Encoding & formats7
JSON Formatter
Paste JSON and it prints it back with your browser's own …
Encoding & formatsBase64 Text Encoder / Decoder
Encode text to Base64 or decode it back. Works on UTF-8 …
Encoding & formatsURL Encoder / Decoder with Query-String Breakdown
Split a link into scheme, host, port, path, query and …
Encoding & formatsCSV to JSON Converter
Paste CSV and get an array of objects, or paste JSON and get …
Encoding & formatsMarkdown to HTML
CommonMark block structure resolved by column arithmetic, …
Encoding & formatsHTML to Markdown
Paste markup, get markdown back - with the whole path in …
Encoding & formatsHTML Entity Escape and Unescape
Turn plain text into HTML-safe markup (& < > quotes, plus …
Encoding & formatsText7
Word Counter
One text, three character counts: code units as they are …
TextCase Converter for Identifier Names
Turn a name, or a whole column of names, into camelCase, …
TextText Diff
Diff two blocks of text line by line: an exact …
TextNumber to Chinese Words
One number in, both Chinese spellings out: the plain reading …
TextText Dedupe and Sort by Line
Paste a column of text and it drops duplicate lines, strips …
TextList Converter
Paste any messy list and get it back as plain lines, comma …
TextText Encoding Repair
Give it a file and it reads the bytes: the mark at the …
TextDate & time6
Unix timestamp to date and time
Paste a 10-digit second or 13-digit millisecond timestamp …
Date & timeDays Between Two Dates
Pick two dates and the gap comes out every way you might …
Date & timeAge Calculator
Type a birthday and read the age the way people actually say …
Date & timeDate Add and Subtract
Add or take away years, months, weeks, days, hours and …
Date & timeTimezone Meeting Planner
Type a date and a clock reading, say which zone that reading …
Date & timeCron Expression Parser
Paste a crontab line and it splits the five or six fields, …
Date & timeCalculators & units7
Percentage Calculator
Four separate answers for the four questions people actually …
Calculators & unitsCalculator
Type a whole expression and get the answer: brackets, × ÷, …
Calculators & unitsStorage Unit Converter
Type a size such as 1.5 GiB, 500MB or 8e3 KB and it prints …
Calculators & unitsLoan Payment Calculator
Enter the loan amount, annual rate and term to get the …
Calculators & unitsDaily Rate to Annual Salary
Turn a day rate into an annual, monthly and hourly figure …
Calculators & unitsSavings Goal Calculator
Enter a savings target, what you already have, your monthly …
Calculators & unitsBase Converter
Convert any integer or decimal fraction between base 2 and …
Calculators & unitsImages & colour5
Color Format Converter & WCAG Contrast Checker
Convert one color between HEX, rgb() and hsl() and read its …
Images & colourImage Compressor
Measures compression instead of promising it: real bytes out …
Images & colourImage to Base64
Pick a picture from this device and get back exactly the …
Images & colourImage EXIF Reader
Pick a JPEG, PNG, WebP or TIFF file and read the metadata …
Images & colourContrast Checker
Paste a foreground and a background as hex, rgb(), hsl(), …
Images & colourGenerators5
Password Generator with Real Randomness
Draw passwords from the browser's cryptographic random …
GeneratorsUUID Generator
Make v4, v7 or v1 UUIDs in your browser, from …
GeneratorsQR Code Generator
Mode chosen by bit cost, version sized by arithmetic, …
GeneratorsRandom Number Picker
Whole numbers, decimals, or names you paste in — drawn from …
GeneratorsEAN Barcode Generator
Type or paste an EAN-13, EAN-8 or UPC-A number and build the …
GeneratorsDeveloper4
Regex Tester with Match Positions, Capture Groups and Replace Preview
Type a pattern and some text and see every match with its …
DeveloperJSON to TypeScript Converter
Paste a JSON response and get TypeScript declarations for …
DeveloperJWT Decoder
Paste a JSON Web Token and it splits the three base64url …
DeveloperCharacter Codes
Paste any text and read it back as code points, UTF-8 and …
DeveloperNetwork & checksums3
Hash and Checksum Calculator
Type text or pick a file and get every digest at once: MD5, …
Network & checksumsHTTP Status Code Lookup
Enter a status code, or paste a response line and a log …
Network & checksumsIPv4 Subnet Calculator
Paste an IP with a prefix (like 192.168.1.0/24) to get the …
Network & checksumsNothing matches. Try another word, or hit All.