The latest articles on DEV Community by Syed Roman (@botsquash). https://dev.to/botsquash 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%2F3776903%2Fe8ae0d75-56a5-4a81-b1c0-09b06eaae1b3.png https://dev.to/botsquash en Syed Roman Tue, 17 Feb 2026 06:16:18 +0000 https://dev.to/botsquash/i-built-29-free-tools-that-never-upload-your-files-3pel https://dev.to/botsquash/i-built-29-free-tools-that-never-upload-your-files-3pel <p>Here is your <strong>clean, properly structured Markdown</strong> (ready to paste into dev.to or GitHub):</p> <h2> The Problem with Online Tools </h2> <p>Every time you use an "online image converter" or "PDF merger," you're uploading your files to someone's server.</p> <p>Even if they claim "secure processing," your data:</p> <ul> <li>Travels over the internet</li> <li>Sits on their servers (temporarily or permanently)</li> <li>Is subject to their privacy policies</li> <li>Could be breached, leaked, or analyzed</li> </ul> <p>For sensitive documents, personal photos, or confidential work — this is a problem.</p> <h2> The Solution: Client-Side Processing </h2> <p>I built <a href="https://toolmansion.com" rel="noopener noreferrer">ToolMansion</a> — a collection of 29 free tools that run <strong>entirely in your browser</strong>.</p> <p>What this means:</p> <ul> <li>✅ Your files NEVER leave your device</li> <li>✅ No accounts, no tracking, no cookies</li> <li>✅ Works offline after page load</li> <li>✅ Zero server processing</li> </ul> <h2> The Tech Stack </h2> <ul> <li> <strong>Next.js 16</strong> + React + TypeScript</li> <li> <strong>WebAssembly</strong> (Rust compiled to WASM) for image processing</li> <li> <strong>pdf-lib</strong> for PDF manipulation</li> <li> <strong>Static export</strong> — no backend needed</li> </ul> <p>All processing happens client-side using:</p> <ul> <li>Canvas API for images</li> <li>Web Crypto API for security tools</li> <li>FileReader API for local file access</li> </ul> <h2> The Tools </h2> <h3> Image Tools </h3> <ul> <li>Convert (JPG ↔ PNG ↔ WebP)</li> <li>Resize with social media presets</li> <li>Compress to target file size</li> <li>Crop with aspect ratio guides</li> <li>Remove EXIF data (privacy!)</li> </ul> <h3> PDF Tools </h3> <ul> <li>Merge multiple PDFs</li> <li>Split / extract pages</li> <li>JPG to PDF converter</li> <li>PDF to images</li> </ul> <h3> Developer Tools </h3> <ul> <li>JSON formatter / validator</li> <li>Base64 encoder / decoder</li> <li>URL encoder / decoder</li> <li>UUID generator</li> <li>Hash generator</li> <li>Color picker</li> </ul> <h3> Text Tools </h3> <ul> <li>Word counter with reading time</li> <li>Case converter</li> <li>Remove duplicate lines</li> <li>Extract emails / URLs</li> <li>Text diff</li> </ul> <h3> Generators </h3> <ul> <li>QR code generator</li> <li>Password generator</li> <li>Lorem ipsum</li> </ul> <h2> Why WebAssembly? </h2> <p>JavaScript is great, but image processing is computationally intensive. WebAssembly gives near-native performance directly in the browser.</p> <p><strong>Example:</strong><br> Processing a 10MB image takes ~200ms with WASM vs ~2 seconds with pure JavaScript.</p> <h2> The Privacy Angle </h2> <p>This isn't just a technical choice — it's a privacy stance.</p> <p>When you convert an image on ToolMansion:</p> <ol> <li>File loads into browser memory</li> <li>WASM processes it locally</li> <li>Result downloads directly</li> <li>Nothing ever hits a server</li> </ol> <p>Your sensitive documents, personal photos, and confidential files stay on your device — where they belong.</p> <h2> Try It Out </h2> <p>All tools are 100% free. No signup required.</p> <p>🔗 <a href="https://toolmansion.com" rel="noopener noreferrer">toolmansion.com</a></p> <h2> Open Source? </h2> <p>Considering open-sourcing the core utilities. Would that be valuable?</p> <p>Let me know what tools you'd like to see added! 🚀</p> javascript webassembly privacy opensource