Combine several PDFs into a single document, in the order you choose.
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What is a Merge PDF?
Merging joins several PDFs end to end into one file. The pages are copied across exactly as they were — the same text, the same fonts, the same images at the same resolution — and reindexed into a single document.
That copying is worth understanding, because it is what separates merging from converting. There is no rendering step and no re-compression: a merge rearranges the structure of a PDF rather than reinterpreting its contents. Text stays selectable and searchable, vector graphics stay sharp at any zoom, and nothing gets a second lossy pass. A merged page is not a picture of the original page; it is the original page.
The practical use is assembling something that arrived in pieces — a signed contract plus its annexes, scanned receipts for one expense claim, chapters exported separately. Order matters in all of those, which is why the file list here can be rearranged before you merge rather than sorting itself alphabetically and hoping.
How to use it
Drop two or more PDFs onto the upload area, or click it to browse. You can add more at any point.
Put them in the order you want using the up and down arrows — the numbers show the final sequence.
Remove anything you picked by mistake with the × button.
Press Merge PDFs, then download the combined file.
Frequently asked questions
Are my files uploaded anywhere?
No. The merge happens entirely in this browser tab — your PDFs are read from your device and no part of them is sent over the network. That is why the page carries the “Runs in your browser” badge, and it is why there is nothing stored to delete afterwards.
Does merging reduce quality?
No. Pages are copied structurally rather than re-rendered, so nothing is re-compressed. Images keep their original resolution, text stays selectable, and vector content stays sharp. The merged file is normally close to the sum of the inputs in size, sometimes slightly smaller where the documents shared resources.
Can I change the page order?
You can set the order of the documents before merging, using the arrows in the file list. Reordering individual pages within a document is a different job — that belongs to a page-organiser tool rather than this one.
Why was one of my files rejected?
Each file is checked by reading its opening bytes rather than trusting the extension, so anything that is not really a PDF is refused by name. Password-protected PDFs are also refused: their contents cannot be read without the password, and merging them would produce a file with unreadable pages. Remove the password first and try again.
Is there a limit on how many PDFs I can merge?
There is no fixed count, but there are size limits: 25MB per file and 60MB in total. Everything is held in your tab's memory while the merge runs, and past roughly that point the browser risks killing the tab — a clear message about the limit is better than a crash mid-merge.
Do bookmarks, form fields and links survive?
Page content, including link annotations on the page, is carried over. Document-level structures are not always: the outline (bookmarks) and interactive form fields belong to the document as a whole rather than to any page, so they are generally not preserved in the merged file. If a form's field data matters, flatten or export it before merging.