PDF Merger
Combine multiple PDFs into one file
Free PDF merger — combine multiple PDFs, browser-based
Toololis PDF Merger combines multiple PDF files into one, entirely in your browser. Drag to reorder, then merge with one click. Powered by the open-source pdf-lib library. Your PDFs are never uploaded.
How to use this tool
- 1
Add your PDF files
Drop multiple PDFs or tap to browse. They appear as a reorderable list.
- 2
Reorder if needed
Drag the ≡ handle on each item to change the order. The final PDF keeps this sequence.
- 3
Click Merge
Files merge in your browser. A download link for the combined PDF appears instantly.
Common merge scenarios
- Receipts and invoices — Combine into one monthly expense report
- Scanned documents — Merge multi-page scans into a single PDF
- Contract packages — Combine contract + NDA + appendix into one deliverable
- Meeting handouts — Merge agenda + slides + notes into one file
- Academic papers — Combine references, figures, and manuscript
Frequently Asked Questions
Are my PDFs uploaded anywhere?
No. Merging happens entirely in your browser using the
pdf-lib library. Your documents never leave your device. Safe for contracts, medical records, tax returns.What's the file size limit?
Practical limit is around 200 MB total (all files combined), depending on your device RAM. For massive PDFs, process in chunks.
Can I merge encrypted / password-protected PDFs?
No — encrypted PDFs must be decrypted first. Open in a PDF viewer that lets you "export" or "print to PDF" as an unencrypted copy, then merge.
Do bookmarks and form fields survive?
Bookmarks: yes. Form fields: typically yes, but complex interactive forms may lose some styling. Signatures will be invalidated (expected — the document has been modified).
What happens to page size differences?
Each PDF keeps its original page sizes. The merged PDF can have mixed page sizes — A4, Letter, Legal all coexist.
Is there a limit on number of files?
Tested with up to 50 files. No hard limit, but browser may slow with large counts.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.