Are my PDFs uploaded anywhere?

No. The merger runs entirely in your browser using the pdf-lib library. Your files never leave your device and nothing is sent to a server.

Can I reorder the PDFs before merging?

Yes — use the ↑ and ↓ buttons next to each file, or remove any file with ×. The order in the list is the order in the merged PDF.

Is there a file size limit?

There's no hard limit, but very large merges (hundreds of MB) may be slow because all processing happens on your device.

Does it work with password-protected PDFs?

It tries to open protected PDFs and skips password prompts. If a file is fully encrypted, the merge may fail — remove the protection first with a dedicated tool.

Merge PDF

Combine multiple PDFs into one, in the order you want — all in your browser.

No upload
Browser-based
Free
No signup
PDF

Choose PDF files or drag and drop here · you can add more later

Depends on the tool — client-side tools keep files on-device; server tools auto-delete files after processing.

How to use Merge PDF

Drop the first PDF into the upload area — or click to browse and pick multiple files at once.
Add more PDFs by dropping additional files into the same area (nothing gets replaced).
Reorder files with the ↑/↓ buttons — the top-to-bottom order becomes the page order in your merged PDF.
Remove any file with the × button if you added it by mistake.
Click Merge PDFs. Your combined PDF is ready to download in seconds — no waiting, no upload.

Common use cases

Contracts and legal packets. Combine a signed contract, an addendum, and supporting documents into a single PDF before emailing — recipients hate multi-file attachments.
Academic submissions. Merge a cover letter, CV, transcript, and portfolio into one file when applications only accept a single PDF upload.
Chapter compilation. Combine multiple book chapters, reports, or lecture slides in the exact order you want them read.
Scanned document consolidation. Phone-scanned documents often save each page as a separate PDF — merge them into one file for archival.

Tips

Merging preserves the original quality — pdf-lib does not re-encode any pages, so text stays sharp and file size roughly equals the sum of inputs.
There is no upload, so a 200 MB merge processes as fast as your device can handle it — usually seconds.
The output PDF inherits the metadata of the first file. Rename the file after download if you want a specific title.
For very large merges, close other browser tabs — everything runs in your device's memory.

Troubleshooting

The merged PDF is huge.: PDFs with embedded high-resolution images compound quickly. Use a compress-PDF tool on individual files first, then merge.
One file won't open.: Password-protected PDFs can fail to merge silently. Try opening the file in your PDF reader first; if it prompts for a password, remove it before merging.

What to try next

Frequently asked questions

Are my PDFs uploaded anywhere?: No. The merger runs entirely in your browser using the pdf-lib library. Your files never leave your device and nothing is sent to a server.
Can I reorder the PDFs before merging?: Yes — use the ↑ and ↓ buttons next to each file, or remove any file with ×. The order in the list is the order in the merged PDF.
Is there a file size limit?: There's no hard limit, but very large merges (hundreds of MB) may be slow because all processing happens on your device.
Does it work with password-protected PDFs?: It tries to open protected PDFs and skips password prompts. If a file is fully encrypted, the merge may fail — remove the protection first with a dedicated tool.