PDF Merger — Combine PDF Files into One Online Free
Free online PDF merger to combine multiple PDF files into a single document. Drag, reorder, and select specific pages from each file before merging. Join PDFs quickly with custom page selection — 100% client-side, your files stay private.
100% client-side. Your PDFs are processed locally using pdf-lib — no files are uploaded to any server.
Output File
How to use
Drop or upload 2 or more PDF files
Drag to reorder using ↑ ↓ arrows
Optionally select custom page ranges per file
Click 'Merge & Download'
Drop PDF files here
or click to browse — multiple files supported
Add at least 2 PDF files to merge
How to Use PDF Merger
Upload PDF files
Drop or upload two or more PDF files. You can add multiple files at once.
Reorder and configure
Drag to reorder files. Optionally select specific page ranges from each file instead of merging all pages.
Review summary
Check the file count, total pages, and total size before merging.
Merge and download
Click 'Merge & Download PDF' to combine all files into a single document — 100% client-side.
Frequently Asked Questions
There is no set limit, but browser performance may decrease with very large numbers of files. Most users merge 2-10 files comfortably.
Yes. Click on a file to expand page range options. You can enter custom ranges like '1-3, 5' to include only certain pages.
Files up to 100 MB typically work well. Extremely large files may hit browser memory limits since everything runs client-side.
Basic merging preserves page content. Some PDF features like bookmarks, internal links, and form fields may not carry over perfectly.
No. You must remove passwords from protected PDFs first using the Unlock PDF tool before merging.
No. All merging is done locally in your browser using pdf-lib. Your files never leave your device.
Each page retains its original dimensions. The merged PDF will contain pages of varying sizes if the source files use different page sizes.
Try an Example
Sample files
chapter1.pdf, chapter2.pdf, chapter3.pdf
3 files · 28 pages · 12.3 MB → 1 merged PDF
Single merged PDF with all 28 pages
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