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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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Add a watermark

Stamp text or a logo on pages

How it works

Stamp text or a logo across your pages — centred or tiled, faint or bold, on all pages or just some.

  1. Add one PDF file.
  2. Type the watermark text or choose an image.
  3. Adjust opacity, angle, layout and pages — the preview updates live.
  4. Choose “Add watermark” and download.

Questions

Can the watermark be removed?

It’s drawn into the page content, so it can’t simply be switched off. Determined editors can still remove it with PDF editing software.

Can I use Bengali or Arabic text?

Yes — Latin, Greek, Cyrillic, Bengali, Devanagari and Arabic are supported.

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.