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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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Annotate a PDF

Highlight, draw, arrows & notes

How it works

Mark up a PDF with highlights, pen, boxes, arrows and text — then save it with your marks built in.

  1. Add one PDF file.
  2. Pick a tool and colour, then draw on the page.
  3. Use the eraser or Undo to fix mistakes; switch pages with the page strip.
  4. Download the annotated PDF.

Questions

Can others edit my annotations?

They’re drawn into the page, so they appear the same everywhere and can’t be edited or hidden like regular PDF comments.

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.