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Merge PDFs in your browser

Add the files, put them in order, and get one PDF. Every page keeps its links, form fields and annotations.

Tool · runs in this tab · free
Drop the PDFs to merge

Add two or more. They are read in this tab and joined in a Web Worker; nothing is uploaded.

Read in this tab. Never uploaded.

How this runs

Nothing loads until you add a file. Then the engine starts in a Web Worker in this tab.

This jobwaiting
Requests since your file0
Other origins contacted0
Enginepdf-lib, Web Worker
Reported by this page. Check it yourself: switch off your network and run the tool again.

What merging keeps

Pages are copied with their own resources, so text, images, fonts, links and annotations come across unchanged. Form fields from each file are kept; if two files use the same field name, a viewer may treat them as one field, so fill forms before you merge them.

Encrypted files that open without a password (many official forms are like this) are decrypted on your device first. Files that need a password must be unlocked with it before merging.

Bookmarks from the source files are not carried over yet.

Steps

  1. Add two or more PDFs (or drop them on the page).
  2. Drag or use the arrows to set the order.
  3. Press Merge.
  4. Download the combined PDF.

Limits, stated plainly

  • Bookmarks (the outline) of the source files are not merged.
  • Very large merges are limited by your device’s memory; the page warns you before you start if a file looks too big for this browser.
Already have Preview or Edge? On a Mac, Preview can merge: open the first PDF, show thumbnails, and drag the other files into the sidebar.

Engine: pdf-lib in a Web Worker. Your file is not uploaded; check it yourself.