Merge PDF files.
Combine PDFs into one file locally — nothing is uploaded.
Drop PDF files here
or browse your files
Paste with ⌘V · or drop files anywhere on the page
Files never leave your device. Everything runs in your browser, nothing touches a server — tools you've used even work offline.
Combine any number of PDFs into a single document, assembled entirely in your browser. Drop the files, arrange them with the list arrows, and merge — pages are copied losslessly, so nothing is re-encoded unless you also tick “Compress after merging”. No server ever touches your documents.
How it works
- Drop files anywhere on the page, click to browse, or paste with ⌘V.
- Pick a quality or preset — or set an exact target size and let the tool find it.
- Compress, compare before/after, and download — individually or as a ZIP.
Merging without quality loss
The merge itself is lossless: pages are copied from each source PDF into the combined document exactly as they are — text, images, links and fonts are untouched, just reassembled. The output is only as large as its inputs combined, so if the result feels heavy, that weight was already in the sources.
Merge and compress in one pass
Tick “Compress after merging” to hand the combined file straight to the same compression engine behind the Compress PDF tool. This is the right order of operations — compressing one merged file beats compressing ten inputs separately, because images are downsampled once, consistently, and you check the size limit against the final document.
Typical uses
| Task | How |
|---|---|
| Combine scanned pages | Drop the scans in shooting order — each becomes consecutive pages |
| Assemble a report | Cover, body and appendix PDFs in list order, compress at Medium |
| Bundle invoices | Merge a month of invoices, then compress to email size |
Frequently asked questions
How do I control the page order?
The merged PDF follows the list order — use the arrows on each row to rearrange files before merging. Pages inside each file keep their original order.
Can I merge and compress in one step?
Yes — enable “Compress after merging” and the combined document is compressed right after assembly, with the preset you pick. Leave it off for a lossless merge.
What about password-protected PDFs?
Encrypted files can’t be merged directly. Remove the password first with the Unlock tool — it runs locally too — then merge the unlocked copies.
Are my documents uploaded?
No. The PDFs are opened and stitched together entirely in your browser — the merged document is assembled on your device, and nothing is ever transmitted anywhere. Want proof? Run one file through, switch your connection off, and run another — it still works.