The latest articles on DEV Community by Pradeep Rathod (@pradeeprathod1165). https://dev.to/pradeeprathod1165 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4144455%2F219287d3-c09d-40be-abb7-51df7c13a12c.jpg https://dev.to/pradeeprathod1165 en Pradeep Rathod Sat, 26 Sep 2026 14:21:21 +0000 https://dev.to/pradeeprathod1165/i-built-a-100-client-side-file-converter-in-react-webassembly-zero-cloud-uploads-m9n https://dev.to/pradeeprathod1165/i-built-a-100-client-side-file-converter-in-react-webassembly-zero-cloud-uploads-m9n <p>Every time I needed to convert an iPhone <code>.HEIC</code> photo, merge PDFs, or convert a CSV to Excel, online tools forced me to upload private files to their cloud servers and hit me with a "Max 3 files per day" paywall.</p> <p>With modern browser APIs, uploading files to a backend server just to convert formats isn't necessary anymore. So I built <strong>ZeroConvert</strong>:</p> <p>🔗 <strong>Live Tool:</strong> <a href="https://getzeroconvert.com" rel="noopener noreferrer">https://getzeroconvert.com</a></p> <h3> How It Works Under the Hood </h3> <ul> <li> <strong>Images (HEIC, WebP, AVIF, PNG, JPG):</strong> Processed locally using HTML5 Canvas and client-side decoding buffers.</li> <li> <strong>Documents &amp; PDFs:</strong> Merged and converted in local RAM via <code>pdf-lib</code> and <code>pdfjs-dist</code>.</li> <li> <strong>Spreadsheets &amp; Data (XLSX, CSV, JSON, XML):</strong> Parsed instantaneously in the browser using SheetJS.</li> <li> <strong>Audio &amp; Video (MP4, MP3, WAV, WebM):</strong> Powered by <code>FFmpeg.wasm</code> running inside Web Workers.</li> </ul> <p>Because there are zero server uploads, conversions happen at native memory speed with 100% privacy and zero daily caps. </p> <p>Would love for you to test it out and let me know what formats or features I should add next!</p> webdev react javascript showdev