How to use this tool
- Drag your PDF files into the drop zone, or click it to browse for them.
- Reorder the list with the ↑/↓ buttons — the merged file follows this order top to bottom.
- Click "Merge PDFs & Download" — the combined file downloads straight to your device.
Common mistakes to avoid
- Don't merge an encrypted/password-protected PDF — decrypt it first, since the tool can't read protected files.
- Double-check the file order before downloading — there's no undo once the merge starts.
Why merge PDFs in the browser instead of uploading them?
Most free PDF mergers upload your files to a server, combine them there, and hand back a download link — meaning your documents sit on infrastructure you don't control, even briefly. This tool uses pdf-lib to merge files using your device's own CPU and memory, so nothing about your documents — their content, filenames, or the fact that you merged them — is ever visible to us.
Frequently asked questions
- How many PDFs can I merge at once?
- As many as your device's memory can hold — there's no artificial cap from us, since merging happens locally rather than against a server-side quota.
- Can I control the order of the merged pages?
- Yes — add your files, then use the ↑/↓ buttons on each one to reorder the list before merging. The output follows that order top to bottom.
- Will merging reduce quality or add a watermark?
- No — pages are copied into the new PDF as-is, with no re-rendering, quality loss, or watermark added.
- Can I merge a password-protected PDF?
- Not currently — decrypt it first (in whatever tool protected it) before merging, since this tool can't read encrypted files.
How GetByteRush compares
Most free tools for this online work the same way: you upload your file to their server, wait, then download the result — which means your file (and often your email, for a "free" account) sits on someone else's infrastructure. Here's the actual difference:
| Feature | GetByteRush | Typical free PDF merger sites |
|---|---|---|
| File ever leaves your device | No — 100% client-side | Yes — uploaded to process, then deleted per their retention policy |
| Daily merge limits | None | Common on free tiers |
| File size cap | None imposed by us (device-memory bound) | Often capped (commonly 5–100 MB on free tiers) |
| Account required | Never | Often, past a certain usage level |
("Typical online tools" reflects publicly documented behavior of common free file-processing sites as of 2026 — always check a specific competitor's own privacy policy and pricing page, since these details change.)