The latest articles on DEV Community by bunnyconvert (@bunnyconvertpdf). https://dev.to/bunnyconvertpdf 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%2F3920684%2F380f9935-a6fe-40c2-9113-e33a204f6ae6.png https://dev.to/bunnyconvertpdf en bunnyconvert Fri, 08 May 2026 20:07:41 +0000 https://dev.to/bunnyconvertpdf/i-built-a-browser-based-pdf-converter-to-stop-uploading-sensitive-files-to-random-sites-tags-4pfg https://dev.to/bunnyconvertpdf/i-built-a-browser-based-pdf-converter-to-stop-uploading-sensitive-files-to-random-sites-tags-4pfg <p>After uploading what felt like the 100th sensitive contract to a "free" PDF site, I realized I had no idea where those files were going. So I built BunnyConvert — 24 PDF tools that run entirely in your browser using JavaScript.</p> <h2> What It Does </h2> <p>24 tools so far:</p> <ul> <li>Sign PDF (with cursive fonts, drag-to-position)</li> <li>Merge / Split / Compress / Rotate</li> <li>JPG/PNG/HEIC → PDF</li> <li>PDF → Word/Excel/PowerPoint/Image</li> <li>Watermark, Protect, Unlock</li> <li>Image Resize, CSV ↔ JSON</li> </ul> <h2> The Stack </h2> <ul> <li> <strong>Vanilla JS</strong> frontend (no React/Vue)</li> <li> <strong>pdf-lib</strong> for PDF manipulation</li> <li> <strong>pdf.js</strong> for rendering</li> <li> <strong>heic2any</strong> for HEIC decoding</li> <li> <strong>Capacitor</strong> for Android wrapper</li> <li> <strong>Supabase</strong> for opt-out analytics</li> </ul> <h2> Privacy First </h2> <p>Everything runs client-side. Files never touch a server. You can verify in DevTools Network tab — zero outbound file requests.</p> <h2> Tricky Parts </h2> <ol> <li>pdf-lib's StandardFonts don't support Turkish characters → had to embed custom TTF</li> <li>DocuSign-like signature placement in vanilla JS with both touch + mouse drag</li> <li>AdMob production approval is brutal for new publishers (~2-4 weeks of "limited ad serving")</li> </ol> <h2> Try It </h2> <p>Web: <a href="https://bunnyconvert.com" rel="noopener noreferrer">https://bunnyconvert.com</a><br> Android: Google Play (search BunnyConvert)<br> iOS: in submission</p> <p>Free with daily credits. Pro is $4.99/mo for unlimited + ad-free in mobile.</p> <p>Open to feedback or questions.</p> javascript privacy showdev webdev