Merge PDF Files
Combine multiple PDFs into a single document. Drag to reorder, then merge.
100% Private — Your files never leave your device. All processing happens in your browser.
Drop your PDF files here
or click to select — PDF files only
Drag files to reorder before merging
Result
How to Merge PDF Files
Drop your PDF files into the tool, drag them to set the order you want, and click Merge PDFs. The combined PDF is generated instantly in your browser using pdf-lib — nothing is uploaded to any server.
Tips for Merging PDF Files
- Arrange files in the correct order — Drag and drop PDF files in the list to reorder them before merging. The final document follows the exact order shown in the file list, so take a moment to verify the sequence.
- Check file sizes before merging — The merged PDF will be approximately the sum of all input file sizes. If the result would be too large, consider compressing individual PDFs first using our PDF Compress tool.
- Merge related documents together — Combine all pages of a multi-part report, split invoices, or separated document sections into one cohesive file for easier sharing and archiving.
- Use for assembling application packages — Merge your resume, cover letter, references, and portfolio into a single PDF when submitting job applications or grant proposals that require a unified document.
- Preview before downloading — After merging, verify the page count matches your expectations. The tool shows the total number of pages in the merged result so you can confirm all documents were included.
When to Merge PDF Files
- Combining scanned documents — Merge individually scanned pages of a multi-page document (contract, form, or book chapter) into a single organized PDF file.
- Assembling reports — Combine separate report sections, appendices, and cover pages created by different team members into one final deliverable document.
- Job and university applications — Merge your resume, cover letter, transcripts, and recommendation letters into a single PDF as required by many application portals.
- Invoice and receipt management — Combine monthly invoices, receipts, or expense reports into a single PDF for accounting, tax filing, or reimbursement submissions.
- Legal document compilation — Merge multiple legal documents, exhibits, and supporting materials into a unified PDF for court filings or client deliverables.
Frequently Asked Questions
Is this PDF merger really free?
Yes, 100% free with no limits on file count or size. We're ad-supported, not data-harvesting.
Is it safe to merge PDFs online?
Absolutely. Your PDF files never leave your device. All merging happens locally in your browser — no server processing involved.
Is there a limit on the number of PDFs I can merge?
No hard limit — it depends on your device's available memory. Most users can merge dozens of PDFs without any issue.
Can I use this offline?
Yes — once the page is loaded, you can merge PDFs without an internet connection.
Can I change the order of PDF files before merging?
Yes — simply drag and drop the PDF files in the list to reorder them before clicking merge. You can also remove individual files from the list if you change your mind. The merged result follows the exact sequence shown.
Does merging affect PDF quality or formatting?
No — merging preserves the original content, layout, fonts, and images of each PDF exactly as they are. The tool combines the raw PDF data structures without re-rendering or re-compressing any content. What goes in comes out unchanged.
Why is my merged PDF so large?
The merged file size is approximately the sum of all input PDFs. If the result is too large for your needs (e.g., email attachment limits), use our PDF Compress tool on the merged file to reduce its size while maintaining readable quality.
Can I merge password-protected PDFs?
Password-protected or encrypted PDFs cannot be merged without first removing the protection. If you have the password, open the PDF in your regular PDF viewer, print to PDF (which creates an unprotected copy), then merge the unprotected version. ImgLab cannot bypass PDF security.