PDF Merge
Combine multiple PDF files into one. Drag cards to reorder.
Add PDF Files
Add multiple times · Minimum 2 files required
Drag or click to add PDF files
Multiple files can be selected
클릭하여 파일 선택
About PDF Merge
PDF Merge lets you combine multiple PDF files into one document instantly, right in your browser. No file uploads, no account needed — your documents stay on your device at all times.
How to Merge PDFs
- 1Click or drag to add the PDF files you want to merge.
- 2Reorder the files by dragging them into the desired sequence.
- 3Click the Merge button to combine them into a single PDF.
- 4Download the merged PDF file to your device.
Popular Use Cases
Combine scanned documents
Merge separately scanned pages — contracts, receipts, or ID copies — into one easy-to-share PDF instead of sending a dozen attachments.
Prepare application documents
Combine your resume, cover letter, portfolio, and certificates into a single polished PDF before submitting a job or school application.
Assemble reports and presentations
Join chapters, appendices, and slide exports created by different team members into one final document with the pages in the right order.
Archive invoices and receipts
Collect monthly invoices or expense receipts into one PDF per month or per project to keep your bookkeeping tidy.
Why FileZoom
No upload — files stay private
Merging happens entirely inside your browser. Your documents are never sent to a server, so confidential contracts stay with you.
Free with no limits
Merge as many PDFs as you like, as often as you like — no account, no subscription, no daily quota.
Fast, with no waiting in queues
There is no upload or server queue. Merging starts instantly and finishes in seconds, even for large documents.
Works on any device
All you need is a modern browser on Windows, Mac, Linux, Android, or iPhone. Nothing to install.
Formats & Features
| Supported input | Any standard PDF — text documents, scanned pages, or image-based PDFs. |
|---|---|
| Output | A single merged PDF containing every page in the order you choose. |
| File limit | No fixed limit on the number or size of files; your device's memory is the only constraint. |
| Page ordering | Reorder files by dragging before merging — pages are combined exactly as shown. |
| Quality | Lossless. Pages are copied without re-rendering, so text and images keep their original fidelity. |
| Processing | 100% in your browser with pdf-lib. No upload, no server, no installation. |
How It Works
FileZoom runs pdf-lib, an open-source PDF engine written in JavaScript, directly in your browser. Your files are read into your device's memory, each page is copied into a new PDF document in the order you arranged, and the finished file is saved straight to your downloads folder. Because the whole process runs on your device, no copy of your document ever exists on a server — there is nothing for anyone else to store, scan, or leak.
Tips & Best Practices
- Drag the file cards into the final reading order before clicking Merge — the on-screen order is the order in the PDF.
- If a file is password-protected, remove the password in your PDF reader first; locked files cannot be merged.
- Merging very large scans? Close other browser tabs to free up memory for faster processing.
- Need only some pages from a file? Split it first with PDF Split, then merge just the parts you want.
FAQ
Are my PDF files uploaded to a server?
No. All merging happens entirely within your browser using pdf-lib. Your files never leave your device.
Is there a file size or page limit?
There is no hard limit. Very large files may take longer depending on your device memory and processing power.
Will the merged PDF preserve bookmarks and links?
Basic content and layout are preserved. Complex bookmarks or interactive forms may not be fully carried over.
Can I merge password-protected PDFs?
Password-protected PDFs cannot be merged. Please remove the password first using your PDF reader.
Can I change the file order before merging?
Yes. Drag the file cards into any sequence before clicking Merge — pages are combined exactly in the order shown.
How many PDFs can I merge at once?
There is no fixed limit on the number of files. For very large batches, your device's available memory is the only practical constraint.
Does PDF Merge work on mobile?
Yes. It runs in mobile browsers such as Safari and Chrome, so you can merge files directly on your phone or tablet.
Will page quality change after merging?
No. Pages are copied without re-rendering, so text, images, and vector graphics keep their original quality.