Drop your files above, drag them into the order you want, and download one combined PDF. Nothing is uploaded — the merge happens inside this page, using your own machine, which is why it finishes in about the time it takes to read this sentence.
Most merge tools rebuild your document from scratch, and things fall out along the way. The two that go missing most often are bookmarks (the clickable outline down the side of a PDF reader) and form fields. This tool keeps both by default.
How to merge PDF
- Add your files. Drop them onto the box above, or click to browse. Up to 30 files at once, 100 MB each.
- Put them in order. Drag the entries in the list to rearrange them. The order in the list is the order in the finished PDF.
- Merge and download. Press Merge PDF. The combined file downloads straight from your browser — there is no upload step and no waiting in a queue.
What happens to your bookmarks
A PDF outline is a tree of destinations, each pointing at a page object. When two files are merged, the second document’s pages are renumbered, so every bookmark in it now points somewhere wrong. The lazy fix is to drop the outline entirely, which is why so many merged PDFs come back with an empty sidebar.
This tool rewrites each destination to its new page index and nests the two outlines under one another in file order. If a document had no outline to begin with, it contributes nothing and the others are unaffected — you will not end up with a stray “Untitled” node for a file that never had bookmarks.
Where merging genuinely goes wrong
Two files with the same form field names. PDF form fields are identified by name, and a merged document cannot have two fields called signature_1. If you merge two copies of the same form, the fields collide and most readers will show the same value in both. Flatten the forms first if you only need the filled-in appearance.
Different page sizes. Merging an A4 report with US Letter scans produces a document that changes size partway through. Nothing is broken and it prints fine, but it looks untidy. There is no automatic fix that does not crop or scale something, so this tool leaves sizes alone rather than guessing.
Encrypted files. A password-protected PDF cannot be read until it is decrypted, and browsers will not silently do that. Run it through Unlock PDF first, with the password you already have.
Very large scanned files. Merging happens in your browser’s memory. Twenty 100 MB scans at once will exhaust a phone long before it exhausts a laptop. If it fails, merge in two batches and then merge the results.
Why this one does not upload
Merging is a structural operation — copy page objects from several documents into one, fix up the cross-reference table, rewrite the outline. None of it needs a server. It has traditionally happened on one because that is how these tools were built fifteen years ago, not because it has to.
Running it here instead means your document never crosses the network, never sits in a queue, and never lands in a temporary directory somewhere. You can confirm that yourself: open your browser’s developer tools, switch to the Network tab, and merge a file. You will see no request carrying it.
Questions people actually ask
Does merging reduce the quality of my PDF?
No. Pages are copied across as they are — the same fonts, the same images, at the same resolution. Merging does not re-encode anything, so the output is byte-for-byte as good as the inputs. The file size is roughly the sum of the originals, minus a little where they share the same embedded fonts.
Will my bookmarks and table of contents survive?
Yes, both. Each file’s outline is remapped to its new page numbers and the outlines are nested in file order. A table of contents page that was built as ordinary text with internal links keeps working too, as long as the links pointed within the same document.
Can I merge a password-protected PDF?
Not directly — an encrypted file has to be decrypted before its pages can be read. Use Unlock PDF with the password you already have, then merge the result. If you do not know the password, no tool can help you, and any site claiming otherwise is either wrong or lying.
Is there a limit on how many files I can combine?
30 files per merge, 100 MB each. That limit exists because the work happens in your browser and memory is finite, not because there is a paid tier above it. For more than 30, merge in batches and then merge the batches — the result is identical.
Do I need an account?
No, and there is nothing to sign up for. If you do sign in, your recent jobs appear under Your files — but for browser-side tools like this one that history records only that a merge happened and how long it took. The document itself was never ours to keep.
Can I change the page order after merging?
Yes — Organize PDF lets you drag individual pages around, delete them, or duplicate them. Merging sets the order of whole documents; Organize handles the pages inside one.