Merge PDF

Combine multiple PDF files into one, right in your browser.

FreeBrowser-basedInstant

Your files are processed locally in your browser and are not uploaded to our servers. Every PDF you add, the reordering, and the merged result all stay in your browser — nothing is uploaded to a server at any point.

How to use Merge PDF

Drop in two or more PDFs, reorder them with the up and down buttons until they're in the sequence you want, then click "Merge PDFs" to combine them into a single file. The result is offered as an instant download. Everything happens locally in your browser — your files are never uploaded to a server.

Key features

  • Drop or select multiple PDFs at once
  • Reorder files with simple up/down buttons — fully keyboard-accessible
  • Remove any file from the list before merging
  • Running total of files selected and combined size
  • Staged progress bar while merging
  • Instant download of the merged PDF, no upload required

Practical use cases

  • Combining scanned document pages into one file
  • Merging multiple invoices or reports into a single PDF
  • Assembling a multi-chapter document from separate PDF files
  • Combining a cover letter and resume into one PDF for a job application

Supported formats

Accepted: pdf — Output: pdf

Limitations

  • Very large combined files may be slow to process on low-memory devices
  • Page order can only be changed before merging, not after
  • Password-protected or encrypted PDFs are not supported
  • Up to 20 files and 60 MB combined per merge

Frequently asked questions

Is there a limit on how many PDFs I can merge?
You can add up to 20 PDF files at once, with a combined size limit of 60 MB across all files. If you hit the limit, remove a file or split your merge into two smaller batches.
Does merging PDFs upload my files anywhere?
No. Every file you add, the reordering, and the final merge all happen locally in your browser using JavaScript. Your PDFs never leave your device.
Can I change the order of the files before merging?
Yes. Each file in the list has up and down buttons so you can arrange them into exactly the order you want before clicking "Merge PDFs." The final document follows that order page for page.
Will merging affect the quality of my PDFs?
No. Merging copies each page as-is into the new document, so text, images, and formatting stay exactly as they were in the original files.

Part of PDF Tools