Tool · runs in your browser
Combine PDFs into one file —
in your browser.
Drop in as many PDFs as you like, drag them into the order you want, and download a single merged document. Your files are read and combined entirely on your device — nothing is uploaded — so it's safe for contracts, statements, and anything confidential.
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Frequently asked questions
- Do my PDFs get uploaded to a server?
- No. Your files never leave your device. Each PDF is read and combined entirely in your browser using the pdf-lib library — nothing is uploaded, stored, or logged. Once the page has loaded it even works offline, which makes it safe for contracts, bank statements, and other confidential documents. You can confirm it in your browser's Network tab: no requests go out while you merge.
- What order will the pages come out in?
- Exactly the order you arrange them. Each PDF is a row you can drag up or down (or move with the arrow keys when the drag handle is focused) — top to bottom becomes the page order in the merged file. Every page of the first PDF comes first, then every page of the second, and so on, so a two-page cover in front of a ten-page report gives you a single twelve-page document.
- How many PDFs can I merge, and is there a size limit?
- You can merge up to 30 PDFs at once, each up to 100 MB. Because the tool reads one document at a time as it builds the combined file, memory stays low even with many pages — the limits are just guardrails so a browser tab is never overwhelmed. There is no page-count limit and no watermark on the result.
- Can I merge a password-protected PDF?
- Not directly — an encrypted PDF has to be unlocked first, so it will be flagged if you add one. Remove its password with our Unlock PDF tool (also 100% in your browser), then add the unlocked copy back here and merge. This is deliberate: the tool never silently drops a file it can't read, so your merged document is never quietly missing pages.
- Does merging reduce quality or bloat the file?
- Neither. Merging copies each source page as-is into the new document — text stays selectable, images keep their original resolution, and nothing is re-compressed or rasterised. The merged file is roughly the sum of the originals; there's no quality loss because no pixels are re-encoded.
- Does it work on my phone?
- Yes. It runs in any modern browser on Android and iPhone as well as on Windows, Mac, and Linux — there's no app to install. Reordering works by dragging the handle on each row, or by focusing it and pressing the up/down arrow keys, so it's fully usable with a keyboard too.