The latest articles on Forem by Moni-2634 (@moni2634). https://forem.com/moni2634 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3809954%2F13c0d827-b3f2-4d77-a0a0-2e602f10ab53.png https://forem.com/moni2634 en Moni-2634 Fri, 06 Mar 2026 13:28:19 +0000 https://forem.com/moni2634/i-built-35-free-developer-tools-that-run-entirely-in-your-browser-2do8 https://forem.com/moni2634/i-built-35-free-developer-tools-that-run-entirely-in-your-browser-2do8 <p>I built <a href="https://evmtools.dev" rel="noopener noreferrer">EVMTools</a> - a collection of 50 free<br> online developer tools. Everything runs client-side in your browser.<br> No data is sent to any server, no signup required.</p> <h2> General Developer Tools </h2> <ul> <li> <strong>JSON Formatter</strong> - Format, minify, and validate JSON</li> <li> <strong>QR Code Generator</strong> - Generate QR codes from any text or URL</li> <li> <strong>Password Generator</strong> - Cryptographically secure passwords</li> <li> <strong>Diff Checker</strong> - Side-by-side text comparison</li> <li> <strong>Word Counter</strong> - Count words, characters, sentences</li> <li> <strong>Character Counter</strong> - With platform limits (Twitter, meta tags)</li> <li> <strong>Markdown Preview</strong> - Live markdown rendering</li> <li> <strong>Color Picker</strong> - Convert HEX, RGB, HSL with contrast checker</li> <li> <strong>Text Case Converter</strong> - camelCase, snake_case, Title Case, etc.</li> <li> <strong>Cron Expression Parser</strong> - Parse and explain cron schedules</li> <li> <strong>SHA-256 / MD5 Hash Generator</strong> - Generate hashes instantly</li> <li> <strong>JWT Decoder</strong> - Decode and inspect JSON Web Tokens</li> <li> <strong>UUID Generator</strong> - Generate v4 UUIDs in bulk</li> <li> <strong>Regex Tester</strong> - Test patterns with real-time highlighting</li> <li> <strong>URL / Base64 / HTML Encoder</strong> - Encode and decode</li> <li> <strong>Image to Base64</strong> - Convert images to Base64 strings</li> <li> <strong>JSON to CSV Converter</strong> - Bidirectional conversion</li> <li> <strong>Lorem Ipsum Generator</strong> - Placeholder text</li> <li> <strong>Slugify Tool</strong> - URL-friendly slugs</li> <li> <strong>Number Base Converter</strong> - Binary, octal, decimal, hex</li> </ul> <p>## Ethereum / Crypto Tools</p> <ul> <li>ABI Encoder/Decoder</li> <li>Calldata Decoder</li> <li>Keccak256 Hash Generator</li> <li>Function Selector Calculator</li> <li>Gas Calculator &amp; ETH Unit Converter</li> <li>Checksum Address Validator</li> <li>Signature Verifier</li> <li>CREATE2 Address Calculator</li> <li>Merkle Proof Generator</li> <li>and more...</li> </ul> <p>## 38 Developer Guides<br> Comparison articles, tutorials, and explainers on DeFi, staking, token<br> standards, smart contracts, and more.</p> <p>## Why I built this</p> <p>I was tired of googling "json formatter online" or "password<br> generator" every time I needed a quick tool. So I built one place with everything I use daily.</p> <p>All tools are completely free and run locally in your browser. Your<br> data never leaves your machine.</p> <p>Check it out: <a href="https://evmtools.dev" rel="noopener noreferrer">https://evmtools.dev</a></p> <p>Feedback welcome - what tools should I add next?</p> webdev javascript ethereum opensource