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JSON, Base64, URLs, UUIDs, hashes, timestamps and test data in one place, with Android, Kotlin, AI and web news and free programming courses.

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Your tools

JSON Formatter & Validator

Pretty-print, minify and check JSON for errors - locally, nothing uploaded.

Base64 Encoder / Decoder

Convert text to Base64 and back, with full Unicode support, in your browser.

URL Encoder / Decoder

Percent-encode text for safe use in URLs, or decode an encoded URL back to readable text.

UUID Generator

Generate random version-4 UUIDs (GUIDs), one or in bulk, instantly in your browser.

Hash Generator

Get the SHA-1, SHA-256 and SHA-512 digest of any text, computed locally.

Unix Timestamp Converter

Convert Unix time (epoch seconds or milliseconds) to a readable date, or a date to a timestamp, instantly in your browser.

Color Converter

Paste a colour in any common format and get HEX, RGB and HSL, with a live swatch.

Password Generator

Create long, random passwords in your browser - with a strength estimate and one-tap copy.

GitHub Repository Finder

Find the top open-source projects for any topic and language, ranked by stars, forks or recent activity.

CPF Generator

Generate valid random CPF numbers with correct check digits, for testing forms and validation logic.

CNPJ Generator

Generate valid random CNPJ numbers with correct check digits, for testing forms and validation logic.

Fake Person Generator (Brazil)

Generate a complete fake Brazilian profile: name, CPF, RG, address, phone and email, for testing.

Android Launcher Icon Generator

Turn text, an emoji or an image into a full set of Android launcher icons, ready to drop into your project.

Icon Library and Downloader

Search hundreds of thousands of open-source icons, recolour them and download SVG or PNG.

Browse all 80 free tools

News

Learn with videos

Free courses from YouTube channels, in order. Tick each lesson as you watch it, set a weekly goal and download your certificate at the end.

CS50x: Introduction to Computer Science

by CS50 · 12 lessons · EN

0 of 12 lessons watched

👥 Study with friends →

Python 3 - Mundo 1

by Curso em Vídeo · 14 lessons · PT

0 of 14 lessons watched

👥 Study with friends →

JavaScript para iniciantes

by Curso em Vídeo · 15 lessons · PT

0 of 15 lessons watched

👥 Study with friends →

HTML5 e CSS3

by Curso em Vídeo · 15 lessons · PT

0 of 15 lessons watched

👥 Study with friends →

Curso Python desde 0

by pildorasinformaticas · 15 lessons · ES

0 of 15 lessons watched

👥 Study with friends →

Videos are played from YouTube (youtube-nocookie.com) only after you press play; your progress stays in this browser. The courses belong to their channels.