Modify files. Privately, in browser.
WASM Sandbox
Isolated Environment
Local Processing
Client-Side Only
Volatile Memory
No Disk Write
Zero-Knowledge
You don’t need to trust a stranger’s “secure” cloud server. Your files stay on your device. We can’t see them. We don’t want to.
Network Silent
No HTTP requests are made during processing. Your file never touches cloud.
Ephemeral State
Files live in your device's volatile memory and vanish instantly when you close the tab.
Transparency by Design.
Modufile operates on a zero-trust, local-first architecture. Explore how our protocols keep your data yours.
How is it 100% private?
We utilize a local-only architecture. Your files never leave your device; all processing happens in-browser via WebAssembly.
Can I use it offline?
Yes. Modufile is a Progressive Web App (PWA). Once loaded, it caches the core engine and functions entirely without an internet connection.
What libraries do you use?
We utilize pdf-lib for PDF manipulation, @imagemagick/magick-wasm for image processing, and mupdf for robust rendering.
Local-Only Loop
Data flows strictly between your device storage and the browser sandbox. No server uploads, no metadata leakage.
What about file size limits?
File size is limited only by your browser's allocated memory. Generally, files up to 1GB are handled smoothly on modern devices.
Is the project open source?
Absolutely. We believe trust is earned through transparency. Our core components are available for audit.
Still have questions?
PDF Tools
Merge PDF
Combine multiple docs into one file.
Split PDF
Separate pages or burst entire document.
Rotate PDF
Rotate pages 90, 180 or 270 degrees.
Remove Pages
Delete specific pages from your PDF.
Extract Pages
Create a new PDF from selected pages.
Watermark
Add text overlay to your documents.
Edit Metadata
Modify title, author, and keywords.
Organize PDF
Sort, rotate, and delete pages visually.
Flatten Forms
Make form fields uneditable.
Add Text
Place text anywhere on your PDF pages.
Add Image
Overlay logos, stamps, or signatures.
Redact PDF
Black out sensitive content permanently.
Page Numbers
Add automatic page numbering.
Resize Pages
Change page dimensions — A4, Letter, custom.
PDF Editor
All-in-one visual PDF editor.
Compress PDF
Reduce file size while maintaining quality.
Unlock PDF
Remove passwords and encryption.
Protect PDF
Encrypt your PDF with a password.
Repair PDF
Fix corrupt or damaged PDF files.
PDF/A
Convert to ISO-standard PDF/A format.
Scan to PDF
Capture images and create a PDF.
PDF to Word
Convert PDF to editable Word doc.
PDF to Excel
Extract tables to Excel spreadsheets.
PDF to PowerPoint
Convert PDF slides to PowerPoint.
Office to PDF
Convert Word, Excel, PPT to PDF.
OCR PDF
Make scanned PDFs searchable.