The latest articles on DEV Community by Nothorik (@nothorik). https://dev.to/nothorik 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%2F3394832%2F60c6731e-1cd0-4b40-adbf-e0f4a11a9167.png https://dev.to/nothorik en Nothorik Mon, 28 Jul 2025 16:57:26 +0000 https://dev.to/nothorik/i-built-a-free-browser-based-audio-converter-using-ffmpeg-and-webassembly-2326 https://dev.to/nothorik/i-built-a-free-browser-based-audio-converter-using-ffmpeg-and-webassembly-2326 <p>For a long time I struggled to find an online audio converter that didn’t require uploading files to a remote server, creating an account, or tolerating endless popups and ads.</p> <p>So I decided to build my own:<br><br> <strong>Free Audio Converter Online</strong> — a lightweight tool that runs 100% in the browser using FFmpeg compiled to WebAssembly.</p> <h3> 🎯 What it does: </h3> <ul> <li>Convert audio files between <strong>MP3, WAV, OGG, FLAC, AAC</strong> </li> <li>Support for <strong>batch conversion</strong> </li> <li>Choose <strong>bitrate, sample rate, channels, and compression mode</strong> </li> <li>Files are never uploaded — <strong>everything happens locally</strong> </li> </ul> <h3> ⚙️ Tech stack </h3> <ul> <li>FFmpeg compiled to WASM</li> <li>JavaScript + Tailwind CSS</li> <li>Runs entirely client-side, no server logic</li> <li>Simple ZIP packaging for multiple outputs</li> </ul> <h3> ✅ Why? </h3> <p>Because privacy matters — and audio conversion should be instant, simple and offline when possible.</p> <h3> 🔗 Try it here: </h3> <p>👉 <a href="https://freeaudioconverteronline.com" rel="noopener noreferrer">https://freeaudioconverteronline.com</a></p> <p>I'd love any feedback, suggestions or testing help!</p> <p><strong>P.S.</strong> If you've worked with audio in the browser or FFmpeg via WASM, I'd love to hear what you've built too!</p> webassembly ffmpeg audiotools showdev