Free online developer tools — fast and private
Zero sign-up. No tracking of your input. Most tools run entirely in your browser for performance and privacy.
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Generators & Security
🔑 Password Generator
Create strong random passwords with custom length and character sets.
🔒 Hash Generator
MD5, SHA-1, SHA-256, SHA-512 of text or files, computed in your browser.
🆔 UUID Generator
Generate v4 UUIDs in bulk and copy in one click.
🔳 QR Code Generator
Make QR codes for links, text and Wi-Fi. Download PNG or SVG.
Encoders & Decoders
🧩 Base64 Encode / Decode
Convert text to and from Base64, with URL-safe and Unicode options.
🔗 URL Encode / Decode
Encode/decode full URLs or components and parse query parameters.
📜 JWT Decoder
Decode header/payload and verify HS256/RS256 signatures in the browser.
Formatters & Converters
📋 JSON Formatter / Validator
Prettify, minify and validate JSON with clear error messages.
🔄 YAML ↔ JSON
Convert YAML to JSON and back — anchors, multi-line strings and multiple documents.
📊 JSON ↔ CSV
Convert JSON arrays to CSV and back, with table preview.
🧮 Number Base Converter
Binary, octal, decimal, hex and any base from 2 to 36.
🎨 Color Converter
HEX, RGB, HSL, HSV, CMYK conversion with contrast checker.
⏱️ Timestamp ↔ Date
Convert UNIX seconds/milliseconds to local/UTC dates and back.
Text Tools
🔢 Word & Character Counter
Count words, characters, sentences and reading time as you type.
🔠 Case Converter
camelCase, snake_case, kebab-case, Title Case, UPPERCASE and more.
🆚 Diff Checker
Compare two texts and highlight added, removed and changed lines.
Developer & Network
🧠 Regex Tester
Live matches, groups and highlighting for JavaScript regular expressions.
🌐 HTTP / cURL Tester
Send HTTP requests with custom method, headers, body and Basic Auth.
⏰ Cron Expression Parser
Explain cron schedules in plain English and list next run times.
🛡️ Chmod Calculator
Convert file permissions between 755 and rwxr-xr-x notation.
📍 What Is My IP
Your public IP address and browser details as websites see them.
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Why Mini Tools?
Mini Tools is a lightweight set of developer utilities built with a privacy-first approach. Your input never leaves the browser, and most tools work fully client-side for speed and security. Use it for everyday tasks: generating passwords, encoding in Base64, formatting JSON, computing hashes, creating UUIDs, decoding and verifying JWTs, encoding URLs, testing regular expressions, converting UNIX time, and transforming YAML↔JSON.
Designed for web developers, QA, DevOps, and power users who want fast, dependable tools with zero bloat. We iterate based on feedback and will add more utilities over time.