I built EVMTools - a collection of 50 free
online developer tools. Everything runs client-side in your browser.
No data is sent to any server, no signup required.
General Developer Tools
- JSON Formatter - Format, minify, and validate JSON
- QR Code Generator - Generate QR codes from any text or URL
- Password Generator - Cryptographically secure passwords
- Diff Checker - Side-by-side text comparison
- Word Counter - Count words, characters, sentences
- Character Counter - With platform limits (Twitter, meta tags)
- Markdown Preview - Live markdown rendering
- Color Picker - Convert HEX, RGB, HSL with contrast checker
- Text Case Converter - camelCase, snake_case, Title Case, etc.
- Cron Expression Parser - Parse and explain cron schedules
- SHA-256 / MD5 Hash Generator - Generate hashes instantly
- JWT Decoder - Decode and inspect JSON Web Tokens
- UUID Generator - Generate v4 UUIDs in bulk
- Regex Tester - Test patterns with real-time highlighting
- URL / Base64 / HTML Encoder - Encode and decode
- Image to Base64 - Convert images to Base64 strings
- JSON to CSV Converter - Bidirectional conversion
- Lorem Ipsum Generator - Placeholder text
- Slugify Tool - URL-friendly slugs
- Number Base Converter - Binary, octal, decimal, hex
## Ethereum / Crypto Tools
- ABI Encoder/Decoder
- Calldata Decoder
- Keccak256 Hash Generator
- Function Selector Calculator
- Gas Calculator & ETH Unit Converter
- Checksum Address Validator
- Signature Verifier
- CREATE2 Address Calculator
- Merkle Proof Generator
- and more...
## 38 Developer Guides
Comparison articles, tutorials, and explainers on DeFi, staking, token
standards, smart contracts, and more.
## Why I built this
I was tired of googling "json formatter online" or "password
generator" every time I needed a quick tool. So I built one place with everything I use daily.
All tools are completely free and run locally in your browser. Your
data never leaves your machine.
Check it out: https://evmtools.dev
Feedback welcome - what tools should I add next?
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