Convert, decode, generate.
No ads. No sign‑up.
A clean set of developer utilities: image, audio and color converters, JWT and cron inspectors, hashes, diffs and generators. Free, open source, and built with Earthling UI.
01 / No ads, ever
Everything runs in your browser: no uploads, no queues, no accounts. Once loaded, it works offline too.
02 / Open source, MIT
Read the code, file an issue or send a fix. The catalog, routes and tools are all in one small repo.
View on GitHub03 / Made by Earthling
An independent, AI-native creative agency, building with the same components you see here.
Start a projectThe collection
Small tools. Sharp edges.
Text & Data
10Case Converter
Convert text between UPPERCASE, camelCase, snake_case, kebab-case, slugs and more.
Whitespace & Line Tools
Trim whitespace, collapse spaces, dedupe and sort lines, remove line breaks.
Encode, Decode & Format
Format and minify JSON, encode and decode Base64, URLs and HTML entities.
Cron Expression Explainer
Type a cron schedule and get plain English, a field breakdown and the next run times.
Number Base Converter
Convert numbers between binary, octal, decimal and hex at any size, via BigInt.
Hash Generator
MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of any text, computed locally.
Unix Timestamp Converter
Epoch seconds, millis or micros to human dates and back, with a live current timestamp.
JWT Decoder
Inspect the header and claims of a JSON Web Token without it ever leaving your browser.
Word Counter
Live word, character, sentence and paragraph counts with reading time.
Text Diff Checker
Compare two versions of a text line by line, entirely in your browser.
Images & Icons
03Audio & Video
01Generators
12Strong Password Generator
Strong password generator. Cryptographically secure random passwords created entirely in the browser — nothing is sent to a server.
UUID v4 Generator
UUID v4 generator. Create one or many random universally unique identifiers, generated locally in the browser.
Random Hex Color Generator
Random hex color generator. Create random #RRGGBB color codes for palettes, placeholders and inspiration.
Random Hex String Generator
Random hex string generator. Create cryptographically secure random hex bytes for tokens, keys and salts — all in the browser.
Lorem Ipsum Generator
Lorem ipsum generator. Create paragraphs of placeholder text for mockups and layouts.
Random Name Generator
Random name generator. Create realistic placeholder names for mockups, tests and sample data.
Random Email Generator
Random email generator. Fake addresses on reserved example domains — safe for mockups, seeds and form testing because they can never be real inboxes.
Random Phone Number Generator
Random phone number generator. Fictional US numbers from the reserved 555-01XX range, so they never reach a real person.
Random IP Address Generator
Random IP address generator. Create IPv4 addresses, private-range addresses, or IPv6 addresses from the reserved documentation prefix.
Random MAC Address Generator
Random MAC address generator. Locally administered addresses that never collide with real hardware vendors.
Test Credit Card Number Generator
Test credit card number generator. Luhn-valid numbers for Visa, Mastercard, Amex and Discover — they pass checkout form validation but are not issued cards, so they cannot be charged.
Random Date Generator
Random date generator. Create random ISO dates within a year range for fixtures, seeds and sample data.