Merge PDF
Combine any number of PDF files into a single document. Drag the files into the order you want, then merge — page quality, text and links are preserved exactly.
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- ProcessingOn your device
- Uploaded to a serverNothing
- InternetNot needed
Don't take our word for it. Turn off your Wi‑Fi, then use this tool. It will work exactly the same, which is only possible because your file never goes anywhere.
Merging PDFs, and what actually happens to your file
Merging is a structural edit rather than a conversion. The pages from each file are copied into one new document in the order you set, and the page content itself is never re-encoded. Text stays text, images keep their original resolution, and nothing is recompressed on the way through.
That matters because it is the reason merging is safe to do on documents you care about. A tool that rasterised your pages would flatten a contract into a stack of pictures — searchable text gone, file size multiplied. Copying page objects across avoids all of that.
Get the order right before you start
Ordering is the part people redo. It is far quicker to line the files up correctly than to reshuffle pages afterwards:
- Add files in the order you want them to appear, rather than adding everything and sorting after.
- Name files so they sort correctly on their own — 01, 02, 03 rather than 1, 2, 10, which sorts as 1, 10, 2.
- If one file belongs in the middle, add the files before it first. Inserting is easier than moving.
- Check the joins, not the whole document. Mistakes cluster where one file ends and the next begins.
What carries over, and what does not
Page content survives merging intact. Some document-level features are attached to the original file rather than to its pages, and those behave differently:
- Text, fonts, vector graphics and images are preserved exactly.
- Internal links that point within the same source file keep working. Links pointing at a different file will not.
- Form fields survive, but two files using the same field name will collide — rename them first if the values must stay separate.
- Digital signatures are invalidated. A signature covers one specific document, so any edit breaks it, in every PDF tool.
When merging is not the fix
If your goal is a smaller file for email, merging works against you — the result is the sum of its parts, and it will be larger than any one of them. Compress afterwards, or send the parts separately. And if you only need a handful of pages out of several documents, extracting those pages first and merging the results gives a much smaller file than merging everything and deleting the rest.
More on this: the full guide to merging PDF files, and how to shrink the result for email.
Questions people ask
Is there a limit on how many files I can merge?
No fixed limit. Because merging happens on your own device, the only real ceiling is your device's memory — hundreds of pages is comfortable on any modern phone or laptop.
Will merging reduce the quality?
No. Pages are copied across as-is, so text stays selectable and images keep their original resolution.
Can I merge PDFs on a phone?
Yes. The work runs in your browser, so any reasonably modern phone handles it. Very large files are limited by available memory rather than by the tool, so a few hundred pages is comfortable while a several-hundred-megabyte scan may not be.
Do bookmarks and links survive the merge?
Links within a single source file keep working, because their target moves with them. Bookmarks and cross-file links are stored at the document level and are not carried across, so a merged file typically needs its outline rebuilt if you rely on one.
Why is the merged file larger than I expected?
Because nothing is thrown away. Each source file may embed its own copy of the same font, and those copies are all kept. Running the result through a compressor afterwards usually recovers a good part of the difference.
Can I merge a password-protected PDF?
Not while it is locked — the pages cannot be read until the password is removed. Unlock it first with a tool like Unlock PDF, then merge the unlocked copy.
How to use it
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How to merge PDF files without uploading them anywhere
Combine several PDFs into one document in your browser — no account, no upload, no watermark. Includes how to fix page order, mixed page sizes and files that are too big.