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Free online dev tools. Generators, converters, formatters - everything runs locally in your browser.

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UUID/GUID Generator v1-v7 Popular
ULID Generator MongoDB ObjectID
Nanoid Generator New
Password Generator Popular Hot
Hash Generator Popular
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Base64 Encoder/Decoder Popular
URL Encoder/Decoder
JWT Decoder/Encoder Popular Hot
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JSON Formatter Popular
JSON ↔ YAML CSV ↔ JSON
Unix Timestamp Popular
Color Converter Image ↔ Base64 Code Minifier
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Text Diff JSON Diff
Regex Tester Popular Hot
Markdown Editor Word Counter Slug Generator
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Crontab Generator
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AI Overview
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From the Blog

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UUID Versions Explained: v1, v3, v4, v5, v6, and v7

A complete technical breakdown of all UUID versions. Covers time-based, name-based, and random UUIDs, with code examples in PHP, Python, and JavaScript, and a practical guide to choosing the right version.

Yesterday Backend

Password Security and Entropy: Why Length Beats Complexity

A technical guide to password entropy for developers. Covers entropy calculation, character sets, passphrases vs random strings, brute force and rainbow table attacks, and secure password generation.

Last Thursday Security

RAG Document Assistant: Answer Questions from Your Own Docs with Ollama, ChromaDB and Docker

Build a local RAG document assistant that reads .txt files, indexes them with vector embeddings, and answers questions using a local LLM — all without a cloud API. Includes a FastAPI backend, a minimal browser UI, and a full Docker Compose setup.

Last Thursday AI
100% Browser-Based

All tools run locally. Your data never leaves your browser.

Secure

Cryptographic functions use browser's Web Crypto API.

Fast

Instant results with no server round-trips.