PDF Merger
Merge multiple PDF files into one document. Drag, reorder, and download instantly in your browser.
PDF merge tool combines multiple PDF files into a single document entirely in your browser. Drop your files, reorder them with the arrows, and click Merge to download the combined PDF. No files leave your device. No account required. Supports any number of PDFs and shows page counts for each file before merging.
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Click or drag PDF files here
Multiple files supported · No size limit · Processed entirely in your browser
All processing happens in your browser. No files are uploaded to any server.
Frequently Asked Questions
- How do I merge PDF files online for free?
- Upload your PDFs using the drop zone or file picker. Arrange them in the order you want using the up and down arrows. Click Merge to combine them into one file. The merged PDF downloads directly to your device. No signup needed and no files are sent to any server.
- Is there a file size limit for merging PDFs?
- No server-side size limit applies because all processing happens in your browser using pdf-lib. Practical limits depend on your device memory. Most computers handle PDFs totalling 200-300 MB without issues. Very large files, above 500 MB combined, may slow down or fail on low-memory devices.
- Can I merge password-protected PDFs?
- Password-protected PDFs cannot be merged directly. The tool shows an error for encrypted files. Open the file in Adobe Reader and go to File, Properties, Security to remove the password. Add the unlocked version to the merger.
- Are my PDF files uploaded to a server?
- No. All processing uses the pdf-lib JavaScript library running entirely in your browser. Your files never leave your device. No data is sent to any server, logged, or stored. You can verify this by turning off your internet connection and confirming the tool still works.
- Can I rearrange the pages before merging?
- Yes. Each file shows up and down arrow buttons for reordering. The number on the left shows the merge sequence. Pages from each file are included in their original internal order. To reorder individual pages within a file, use a dedicated PDF page reorder tool before merging.
When should you use PDF Merge?
PDF merge combines separate documents into one file. Scanned pages, a cover letter with resume, monthly bank statements, and multi-part reports all make good candidates.
The tool handles any number of PDFs and shows the page count for each file before you commit to merging.
How does it work?
Add PDFs by clicking the drop zone or dragging files directly onto it. Each file appears in a list with its name and page count. Use the arrow buttons to change the sequence. The merged output follows the list order from top to bottom.
Click Merge and the browser processes all files using the open-source pdf-lib library. Each source PDF's pages are copied in sequence into a new document. The merged file downloads automatically to your device.
Processing happens entirely in the browser. No files are uploaded to any server. No account is needed. The download is a standard PDF that opens in any reader.
When should you use PDF Merge?
Use it whenever you need to submit multiple documents as one attachment. Job applications often require a combined CV and certificate PDF. Government portals frequently ask for a single merged document with ID, address proof, and application form. Accountants use it to send monthly reports as one consolidated file.
The tool is also useful for combining scanned pages. Scanners often produce one PDF per page. Merge them in the correct order to recreate the full document.
Tips to get the best results
- Check page counts before merging. The tool shows how many pages each file contains. A file showing null pages may be encrypted or corrupted. Remove it before proceeding.
- Rename files descriptively before adding them. The merged PDF uses the internal page structure, not file names. Clear names in the list help you confirm the right order.
- Large files take longer to process. For large batches that stall, split the job. Merge half the files, then merge the two resulting PDFs together.
- The merged PDF preserves original page content exactly. Text remains selectable, links stay active, and embedded fonts are retained from each source document.
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