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About HushPDF

Private by design

  • Files are processed in your browser — never uploaded, tracked, or stored.
  • Free & open source (MIT) — audit, self-host, or fork it.

Limitations

  • Password-protected PDFs aren’t supported.
  • Up to 50 MB per file (150 MB total when merging).
  • It edits the finished PDF, not the Word or design file it was made from.
  • Forms, annotations, or signatures may not carry over when pages are copied.
  • Signatures are images (e-signatures), not certificate-based digital signatures.
  • Typed text supports Latin, Greek, Cyrillic, Bengali, Devanagari and Arabic.
  • Compression helps most with scanned or image-heavy PDFs.
  • OCR (beta) downloads a language model on first use; your pages stay on your device.
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Compare PDFs

See what changed between two PDFs

How it works

Find exactly what changed between two versions of a document — word by word.

  1. Add the original and the changed version.
  2. Choose “Compare”.
  3. Review additions (green) and removals (red); show changes only if you like.
  4. Download an HTML report to share.

Questions

Does it compare layout or images?

No — it compares the text. Formatting, layout and image changes aren’t detected.

Can it compare scanned PDFs?

Run both through OCR first so they contain text.

Are my files uploaded to a server?

No. Every operation runs locally in your browser using JavaScript (pdf-lib, with page previews from PDF.js). Your documents are never transmitted to us or to any third party, and there are no accounts, watermarks, or file-retention tricks. You can even disconnect from the internet after the page loads and the tools still work.