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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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Merge PDF files

Combine PDFs into one file

How it works

Combine several PDFs into a single document. Add your files, arrange them in the order you want, and download the merged result — all on this device.

  1. Add two or more PDF files using the drop area or file picker.
  2. Drag files (or use the arrow buttons) to set the order they should appear in.
  3. Choose “Merge PDFs”. Pages are copied in exactly that order.
  4. Download the combined file. Nothing was uploaded anywhere.

Questions

Is there a file size limit?

Files up to 50 MB each and 150 MB combined are supported. Because everything runs on your device, very large files also depend on your device’s available memory.

Will merging change the quality of my pages?

No. Pages are copied from the original PDFs without re-rendering or recompressing them, so text, images, and vector content keep their original quality.

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.