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Merged in the browser - nothing is uploaded

Put several PDFs into one clean file

Contracts, scans, tickets, a signed page and an appendix: drop them in the order you want, reorder with two clicks, and download one PDF. The files never leave your device.

Short answerLast edited October 31, 2026

The PDF Merger combines several PDF files into one document, in the order you arrange, and lets you download the result. The pages are copied in your browser, so a contract or an invoice is not uploaded, and the output is roughly the sum of the input sizes.

Printing to PDF is not merging

"Print → Save as PDF" is the usual shortcut, and it quietly damages the file: links stop working, form fields flatten, bookmarks disappear, page sizes get forced to one paper format, and the output is often larger than the inputs. Merging keeps the pages as they are - the text layer, the vector lines, the signatures, the page geometry.

The difference matters most with documents that were not made to be printed. A scanned invoice has a different page size than an A4 contract; a bank statement has selectable text; a signed page has an annotation layer. Print-to-PDF normalises all of that into one format, merging does not. If the file is going to a person, a portal or an archive, keep the original pages and combine them.

There is a second reason to merge instead of printing: size. Printing a 20 page contract usually produces a file larger than the sum of its pages, because every page is flattened and re-encoded. A merge adds the pages together and leaves the content alone, so a 3 MB contract plus a 400 KB signature page stays close to 3.4 MB instead of doubling. For an archive that will be stored for years, that difference adds up across thousands of files, and the text layer inside stays searchable - which is the only reason an archive is worth keeping.

Before you merge
  • Name the files so the order is obvious before you start
  • Open each one once: a broken PDF is easier to spot alone
  • Remove password protection first - a locked file cannot be read
  • Decide whether the cover page belongs in the merged file
  • Check that scans are the right way up
  • Keep the originals until you have checked the result

Four steps, no account

1

Drop the PDFs

Two or twenty, in any order at first. The list shows each file and its size.

2

Set the order

Move rows up or down, or remove one. The number on the left is the page order in the result.

3

Merge

The pages are copied one by one into a new document. Nothing is re-compressed.

4

Check and download

Scroll through the result before you send it. The originals are still where they were.

What survives a merge, and what does not

Merging copies pages; it does not rebuild them
ElementAfter mergingWhy
Text and search✓ keptthe text layer is copied as is
Links and email addresses✓ keptannotations travel with the page
Form fields✓ kept, but not combinedeach form keeps its own field names
Bookmarks and outline✗ lostthe outline belongs to the document, not the page
Different page sizes✓ kepteach page keeps its own dimensions
Digital signatures✗ brokena signature covers the original file bytes

Before you send the merged file

Does merging reduce the quality of the pages?
No. The pages are copied as objects, not rendered and re-encoded. A 300 dpi scan stays 300 dpi; a vector chart stays a vector chart. The merged file is roughly the sum of its parts, which is also why merging does not make a file smaller.
Why did my bookmarks disappear?
Bookmarks (the outline in the sidebar) belong to the document, not to a page, so they are not carried over. If the outline matters, add it once after merging with a PDF editor; the page content itself is untouched.
Can I merge password-protected PDFs?
Not while they are locked. Remove the password in your PDF reader first, save a copy, then merge that copy. The tool reads the file locally, so it cannot ask for the password.
Is there a page or size limit?
Only what your device can hold in memory. A few hundred pages of normal documents are fine; a 500 page scan at high resolution can take a while and needs free RAM, because the whole file is assembled in the browser.
Are my documents uploaded anywhere?
No. The PDF library runs in the page and writes the merged file in memory. The server only learns that a merge happened, never the file name or the content.
What if the PDFs have different page sizes?
They keep their own size. The result is a mixed document: an A4 contract, a narrow receipt scan and a landscape slide can sit in the same file. Readers handle that without complaint, and printers either scale or ask. If a uniform format is required, resize the pages before merging rather than after.
Can I merge images into the PDF too?
This tool takes PDFs. To add a photo, save it as a one-page PDF first (the image to PDF tool does that), then drop that file in the list like any other.

One file is easier to send than six

Drop the parts, set the order, download the whole. No account, no watermark, no upload.

Merge my PDFs

Quick facts

  1. Merging copies the pages, so the result is roughly the sum of the input sizes; nothing is re-compressed.
  2. A merge does not renumber anything printed on the page, so a footer that says “page 3 of 8” keeps saying it.
  3. A PDF describes every element by its position on the page, which is why it looks identical everywhere and why its text does not reflow.Adobe
  4. PDF 2.0 permits AES-256 encryption for the password that protects a document, while older files may use 40-bit RC4.Adobe
  5. PDF/A forbids encryption and requires every font to be embedded, because an archive must still be readable decades later without the original software.Library of Congress

Questions people ask

How do I merge PDF files into one?
Add the files, drag them into the order you want, and download the combined PDF. The pages keep their original size and content, so the result reads exactly like the separate files put together.
Why is my merged PDF so large?
Merging does not compress, so the result is about the total size of the inputs. Files with large scanned images make the biggest totals. Run the PDF Compressor on the merged file if you need it smaller.
Can I merge PDFs without uploading them?
Yes. The pages are combined in your browser, so the files stay on your device during the merge. You can check the network panel to confirm that nothing is sent.

What this page is about

  • PDF

    The Portable Document Format, standardised as ISO 32000 and documented by Adobe in the PDF 1.7 reference, that fixes the layout of a page.

  • PDF/A

    The ISO profile of PDF for long-term archiving: fonts embedded, no encryption, no audio or video.

  • WebAssembly

    A binary instruction format for the browser, standardised by the W3C, that runs code compiled from C, C++ or Rust at near-native speed.

Official sources cited on this page

  1. PDF 32000-1:2008 — Document management, Portable Document FormatAdobe
  2. PDF/A Family, PDF for Long-term PreservationLibrary of Congress
  3. WebAssembly Core SpecificationW3C
  4. WebAssemblyMDN Web Docs

Continue with the same file

Each of these opens what the tool above produces. Use “Use in another tool” under the result to carry the file over — it moves from tab to tab inside your browser, never to a server.

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Switched-off tools are not listed here: only what works right now.

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