PDF Merger
Combine multiple PDF files into one document
How to Use PDF Merger
- Drop in two or more PDF files, or click to browse. Files are read locally — nothing uploads.
- Reorder the file cards to set which document comes first in the merged output.
- Continue to the page view to see every page from every file as a thumbnail.
- Drag individual page thumbnails to interleave pages across documents if needed.
- Click Merge, preview the result in a new tab, then download.
About PDF Merger
What this page solves
Most online PDF mergers upload your documents — risky for contracts, invoices and scans. This one merges entirely in your browser using pdf-lib and never sends a byte to a server.
PDF Merger combines multiple PDFs into a single document directly in your browser using `pdf-lib`, so signed contracts, payslips, scanned IDs and invoices never touch a third-party server. Drag files into any order, preview the page sequence, and export a clean merged PDF in seconds — no watermark, no signup, no per-day file-count cap that the upload-based services impose. It is the right tool when an HR portal needs your CV plus reference letters as one file, when a visa application asks for passport scans bundled with a bank statement, or when a year-end accountant wants twelve monthly invoices as a single annual PDF. Pair it with the PDF Page Extractor to pull just the pages you need first, then with the PDF Compressor to drop the merged file under a 5 MB or 25 MB email limit. Runs entirely in your browser — no upload, no signup, no logs.
Common Use Cases
- Combine signed contract pages into one PDF before sending
- Merge monthly invoices into a single year-end document
- Stitch scanned ID pages into one PDF for a bank or visa application
- Combine exported pages from Word, PowerPoint and Excel into one file
- Bundle research articles into a single reading PDF
Related tools in PDF Tools
- PDF SplitterSplit a PDF into multiple files by page ranges
- PDF Page ExtractorExtract specific pages from a PDF into a new file
- PDF Page RemoverRemove unwanted pages from PDF files
- PDF Page RotatorRotate PDF pages 90°, 180° or 270°
See all PDF Tools.
Frequently asked questions
Is there a limit on how many PDFs I can merge?
There is no fixed limit, but everything runs in your browser using your own memory. Merging a handful of typical documents is instant. Combining many very large scanned files can exhaust available memory on lower-spec machines, so if the tab becomes unresponsive, merge in two passes instead.
Will merging reduce the quality of my PDFs?
No. Pages are copied wholesale from the source documents into the new file, so text remains selectable and searchable and images keep their original resolution. This is a structural operation, not a re-render.
Can I merge pages from different files in a custom order?
Yes. After adding your files, the page view shows every page across all documents as a thumbnail, colour-coded by source file. Drag any thumbnail to any position and the merged output follows that exact order.
What happens to form fields and bookmarks?
Interactive form fields and bookmarks are not preserved when merging. If your document has filled form values you need to keep, flatten it first so the values become part of the page content.
Are my files uploaded anywhere?
No. The merge runs entirely in your browser using pdf-lib. Your documents never travel over the network, which means there is no server-side copy to be retained or breached.
How to use PDF Merger?
1) Open the tool. 2) Enter or upload your input. 3) Get your result instantly. Everything happens locally — nothing is uploaded.
When should I use PDF Merger?
Use it when combining sensitive PDFs (contracts, payslips, invoices, scanned IDs) or when an upload-based service is too slow or imposes file-count limits.
Is PDF Merger safe?
Yes. PDF Merger runs 100% in your browser. Inputs are never uploaded, stored, or logged — safe for confidential content.
Will quality be affected by PDF Merger?
No quality loss for text and vector content. Embedded images keep their original resolution unless you compress them.
What formats does PDF Merger support?
PDF Merger supports PDF (any version), with import/export to JPG, PNG and TXT in related tools
Is PDF Merger free?
Yes — PDF Merger is completely free, with no registration, no watermarks, and no usage limits.
Can I reorder PDFs before merging?
Yes. Drag files in the queue to set the exact order, and the output PDF follows that sequence page by page.
Is there a file count or size limit?
No artificial cap. Because merging happens locally with `pdf-lib`, the only practical limit is your device's memory — most laptops handle 50+ PDFs and several hundred MB without issue.
Will bookmarks, links and form fields be preserved?
Page content, embedded fonts, images and internal hyperlinks are preserved. Outlines and form fields are kept where the source PDFs include them; encrypted PDFs must be unlocked first.