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Merge PDF

Combine several PDF files into a single document, in the order you choose.

What Merge PDF does

Merging is the most common PDF task there is: a signed page and a cover letter, a set of scanned receipts, chapters submitted separately that have to arrive as one file.

The tool copies pages from each source document into a new one. Nothing is re-encoded, so text stays selectable and images keep their original quality — the result is the same content in a new container.

  • Add as many PDF files as you need
  • Reorder documents before merging
  • Remove a file from the list without starting over
  • Download the combined document

How to use Merge PDF

  1. 1

    Add your PDFs

    Drop in two or more files. They appear as a list in the order they were added.

  2. 2

    Put them in the right order

    Move files up and down until the sequence matches the document you want. Pages within each file keep their existing order.

  3. 3

    Merge

    The combined document is built in the page. Larger sets take a moment.

  4. 4

    Download the result

    Save the merged file, then check the page order before sending it on.

When to use it

Assembling a submission

Combine a form, supporting evidence and a covering letter into the single file a portal will accept.

Archiving statements

Join twelve monthly statements into one annual document for record-keeping.

Putting a scan back together

Scanners often produce one file per batch; merging restores a single document.

Limits and known behaviour

  • Password-protected PDFs cannot be opened. The PDF library used here has no decryption support, so an encrypted file is rejected rather than partially processed. Remove the password in a PDF reader first.
  • Pages are combined in document order. To interleave pages from two files, split them first and merge the pieces.
  • Interactive form fields may stop working once documents are combined, because two source documents can define fields with the same name.
  • Digital signatures are invalidated by merging. That is inherent: a signature certifies a specific document, and the merged file is a different one.
  • Bookmarks, outlines and document-level metadata from the source files are not carried across.
  • There is no file size limit, but the whole document is held in memory while it is processed. Very large or image-heavy files can make the tab slow or unresponsive on a device with limited RAM.

Privacy and data handling

Runs entirely in your browser

  • Your PDF is read into this page by the browser and rebuilt here. It is never uploaded, so no copy of it exists on any server.
  • This matters for the documents people usually merge: contracts, bank statements, medical letters and identity documents.
  • The original file on your disk is not modified; the tool produces a new file for you to download.
  • Nothing is kept after you close the tab.

Site-wide data handling, including analytics and advertising, is described in the privacy policy.

Frequently asked questions

Is there a limit on how many files I can merge?

No fixed limit. The practical constraint is memory, since every document is loaded at once. Merging a large number of big scanned files is the case most likely to fail.

Does merging reduce quality?

No. Pages are copied rather than re-rendered, so nothing is re-compressed.

Why did my form fields stop working?

Form fields are identified by name within a document. When two source PDFs both contain a field called 'name', the merged file has a conflict that the viewer cannot resolve.