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PDF Editor

Merge PDF files

Drop in two or more PDFs, drag them into the order you want, and download a single combined file. Nothing is uploaded.

  • Free, no signup
  • No upload — runs on your device
  • No watermark
  • Unlimited use

Merge PDF

Processed locally
Drop PDF files here

or click to browse · two or more files

    Merging never re-encodes your pages

    A PDF merge is a structural operation, not an image one. The page objects from each source file are copied byte-for-byte into a new document and the cross-reference table is rebuilt around them. That means a merged PDF is lossless: text stays selectable, vectors stay sharp, and a 300 DPI scan stays 300 DPI. If a merge tool ever degrades your quality, it is silently rasterising your pages — which is a compression tool wearing a merge tool's clothing.

    The one thing merging can change is page size. If you combine an A4 report with a US Letter invoice, the output keeps both original dimensions rather than forcing one to match the other. Most viewers handle this fine; some office printers do not, and will scale-to-fit the odd page out. If you are merging for print, check that every source shares a page size first.

    How it works

    1. Drop two or more PDF files into the box, or click to browse
    2. Drag the files by the handle to set the page order
    3. Click Merge and download the combined PDF
    Why nothing uploads. Every operation on this page happens inside your browser using JavaScript and WebAssembly. Your file is read into memory, processed, and offered back as a download. It is never transmitted. Disconnect from the internet after this page loads and the tool keeps working.

    Frequently asked questions

    Does merging reduce the quality of my PDFs?
    No. Merging copies page objects intact — text remains selectable and images keep their original resolution. The output file size is roughly the sum of the inputs, which is the expected result of a lossless operation. If you need a smaller file afterwards, run the result through the Compress PDF tool.
    Can I merge PDFs with different page sizes?
    Yes. Each page keeps its original dimensions in the merged file. This is usually invisible on screen but can cause a printer to scale a page unexpectedly. If uniformity matters, standardise page sizes before merging.
    Is there a limit on how many files I can merge?
    There is no artificial limit. The practical ceiling is your device's memory, since every file is held in RAM while merging. Merging a few hundred megabytes of PDFs is fine on a typical laptop.
    Will my bookmarks and form fields survive the merge?
    Page content, text and images are preserved. Document-level features like bookmarks, form fields and attachments are not carried across, because they live outside the page objects being copied. Flatten forms before merging if the filled values matter.
    Are my files uploaded to a server?
    No. The merge runs in your browser using WebAssembly. You can verify this by opening your browser's network tab, or by disconnecting from the internet after the page has loaded — the tool keeps working.

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