BrowserTools

Merge PDF

Combine multiple PDFs into one document

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-02
Free Private No uploads
What is Merge PDF?

Files you drop in are listed in order, each showing its page count and size, with running totals underneath so you can see what you have assembled before committing. Reorder with the up and down arrows on each row and drop anything you did not mean to include with the ✕. When you merge, pdf-lib creates a fresh document and copies the pages from each source across in list order, so the output is a genuinely new file rather than a bundle or a link farm. Pages are copied without re-encoding, which means no quality loss and no inflation from recompression. The result downloads as merged.pdf. Up to thirty files are kept in the list, and the first two are the minimum needed for the merge button to activate.

Merge any number of PDF files into a single document, with drag-to-reorder control over the page sequence. Merging runs entirely in your browser — confidential PDFs stay confidential.

Private Merge PDF In Your Browser

Merge PDF is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use Merge PDF

1

Drop two or more PDF files onto the file area, or select them together.

2

Check each row's page count and size, and the Files, Total pages and Total size summary.

3

Use the up and down arrows to reorder, and the ✕ to remove anything unwanted.

4

Press the merge button to build the document and download it as merged.pdf.

Key Capabilities
  • Pages are copied across from each source document rather than rasterised, so output quality is identical to input.
  • The list holds up to thirty files, each showing its page count and byte size as it is added.
  • Live totals for file count, page count and combined size appear once anything is loaded.
  • The merge button stays disabled until at least two documents are present, so a single file cannot produce a redundant copy.
Common Use Cases
  • A consultant assembles a signed proposal from separately drafted chapters into a single client-facing PDF.
  • An archivist binds a batch of scanned single-page scans back into their original document.
  • A developer concatenates generated report pages into a single downloadable file for an automated pipeline.
Clear Answers

Frequently Asked Questions

Will merging reduce the quality of my pages?
No. Pages are copied at the object level with no re-encoding, so text stays text and images stay as they were. This is unlike converting through images, which is what the page renderers do.
How many files can I merge?
The list keeps the first thirty files you add. Anything beyond that is not retained for the merge.
What about password-protected PDFs?
Documents are loaded with encryption checks relaxed, but a file that is genuinely encrypted still cannot be parsed and will be reported as unreadable. Unlock it first.
Can I merge only part of a document?
Not here — every page of every file you list is included. Extract the pages you want first with the PDF splitter, then merge the results.

Related Guides

View all guides →
PDF ToolsPDF Merge vs Split: When to Use EachMerge combines, split extracts. Learn when each saves time, how to reorder safely without upload, and how to keep sensitive PDFs local.