Small, exact tools. Your input never leaves your browser.

Text, hex, binary or a whole file to Base64 and back, updating as you type

Build and take apart CCSDS space packets, TM transfer frames and SDLS, a field at a time

MD5, SHA and CRC of text or a whole file. HMAC too, and a checksum to compare against

Escape text for HTML, decode entities back, and handle the quirks browsers add

Morse in both directions, with the real timing and a tone you can hear

Binary, octal, decimal, hex and any base up to 36, with the bits and the float underneath

Write a number out in words, in British or American English, and read words back

Numbers to Roman numerals and the other way round, including the old spellings

CSV to JSON and back, with the quoting, the delimiters and the ragged rows handled

Format, minify and check JSON as you type. Errors get pointed at, not described

Turn a sample response into types for TypeScript, Go, Python, Rust, C#, Kotlin or JSON Schema

Lay out a query so you can read it, or squash it onto one line

Reformat XML, flatten it to one line, or turn it into JSON, and be told where it breaks

YAML to JSON and back, with anchors, block scalars and the Norway problem

What a cron expression actually does, said in English, plus the next times it fires

How long between two dates, and what a date turns into when you add days or months

Add up a week of shifts, take off the breaks, and see what it comes to

One moment shown everywhere at once, with a grid for finding a time that suits everybody

Unix timestamps to dates and back, in any time zone, down to nanoseconds

EAN, UPC, Code 128, Code 39 and ITF-14, with the check digit worked out for you

Placeholder text by paragraph, sentence or word. Seed it and the same text comes back

Strong passwords and passphrases, made in your browser with an honest strength figure

A QR code for a link, a Wi-Fi network, a contact card or anything else, and yours to keep

Numbers, names, teams and dice, drawn fairly and repeatably if you want them checked

Random IDs, keys and passwords at any length, over whatever alphabet you define

UUIDs in every version, formatted the way you need them, and one read back apart

camelCase, snake_case, kebab-case and the rest of them. URL slugs too

Compare two texts side by side, down to the words that changed inside a line

Several replacements in order, each one showing how many times it fired

Convert Markdown to clean HTML, with a preview and no HTML you did not ask for

Match, highlight, replace and split as you type, with your pattern read back in English

Trim, filter, deduplicate, sort and renumber a list, with the pipeline kept visible

See every character in a string, and find the invisible one that is breaking it

Words, characters, sentences and reading time, plus the post limits that bite

Work out the missing dimension, and see what a crop costs you

Every percentage question in one place, including the ones that sound the same

Length, weight, temperature and ten more, converted into every unit at once

One colour in every format, with contrast scores and a scale that holds its hue

Build a gradient and blend it in a space that does not go grey in the middle

Drag a cubic bezier, count out steps, or simulate a spring and take it as CSS

Every icon a site still needs, and none of the ones it stopped needing

Convert and shrink images to WebP, AVIF, JPEG or PNG without uploading them anywhere

Work out a network from any notation, IPv4 or IPv6, right the way down to the bits

Take a JSON Web Token apart, read every claim, and verify the signature right here

Percent-encode and decode the three ways a browser does it, and take a URL apart