Merge PDF
Drag and reorder multiple PDFs into one file — for resumes, reports, contracts, and assignments.
Your PDFs never leave your browser. All processing happens locally on your device.
[ AdSense — PDF Tools ]
Common use cases
| Situation | Files to merge |
|---|---|
| Job application | Resume + cover letter + portfolio → 1 PDF |
| Contract package | Main contract + addenda + exhibits → 1 PDF |
| Assignments / papers | Cover + body + bibliography → 1 PDF |
| Receipts / invoices | Multiple scans bundled → 1 PDF |
| Travel docs | Flight + hotel voucher + visa → 1 PDF |
Related tools
About the pdf-lib library
pdf-lib (Andrew Dillon, MIT). About 700KB, 100% client-side. Supports PDF merging, splitting, page manipulation, form filling, and more.
Working with large files
During processing, tab memory spikes temporarily. Mobile Safari may force-quit near ~200MB, so use a desktop browser for large files. Processing time is driven more by embedded image and font volume than by raw page count.
How do I reorder pages after merging?
This tool currently reorders at the file level only. To rearrange individual pages afterwards, split the merged PDF into ranges and re-merge in your desired order. Per-page reordering is on the roadmap.
Will there be a watermark?
No. The tool adds zero watermarks or branding. AdSense ads only appear in the page UI; the output PDF is clean.
Frequently asked questions
Are my PDF files uploaded to a server?
No. PDF processing happens entirely inside the pdf-lib library running in your browser. Even the site operator cannot see your file contents. Safe for contracts, resumes, and sensitive documents.
Can I merge password-protected PDFs?
Password-locked PDFs may not process automatically. Unlock the PDF in your viewer first, then upload. This tool does not provide decryption — only the authorized owner can unlock the file via a PDF reader.
Can I change the order of files?
Yes. Use the up and down arrows in the file list to reorder. Pages are concatenated in that order into a single PDF. Remove unwanted files with the X button.
How many PDFs can I merge at once?
No hard limit, but it depends on browser memory. Desktop Chrome handles roughly 200MB and 100 pages comfortably.
On mobile, stay under 50MB and 30 pages. For very large files, split first or use a desktop browser.
Are fonts, images, and hyperlinks preserved?
pdf-lib copies pages from the original, so fonts, images, and most hyperlinks are preserved.
Interactive form-field behavior, digital signatures, and certain annotations may behave differently after merging.
The result file is bigger than the originals — is that normal?
Within normal range. pdf-lib copies page objects as-is, so fonts and images from each original may be duplicated.
If size matters, run a separate PDF compressor afterwards, or reduce image resolution in the originals before merging.
References
Last reviewed: 2026-05-05 / Powered by pdf-lib (MIT).
⚠️ After merging, download the result and open it in a PDF reader to verify the page order and contents.