Combine multiple PDFs into one document.
Free & unlimited "” all processing happens privately in your browser.
Or click the button below to browse files from your computer.
Merge PDF is a free online PDF tool that processes PDF files entirely in your browser. It is built on pdf-lib and runs entirely in your browser, so no PDF ever reaches an external server. You can use it without creating an account or installing any software. The result is available for download as a PDF file as soon as processing is complete. It is suitable for personal documents, business files, and anything where privacy and speed matter.
Upload your PDF
Select one or more PDF files from your device.
Configure options
Set any parameters required by this tool.
Process
pdf-lib processes your document locally in the browser.
Download the result
Save your PDF file immediately.
Input Formats
Output Formats
Document management
Merge, split, or reorder PDF pages without desktop software.
File size reduction
Compress PDFs before emailing or uploading to document portals.
Format conversion
Convert PDFs to images or images to PDF for different use cases.
Secure handling
Process confidential documents locally without cloud exposure.
Presentation prep
Extract specific pages or combine multiple reports into one PDF.
Archiving
Standardise document formats for long-term storage.
Check page order before merging
Drag pages into the correct order before processing to avoid re-doing the task.
Use compression for email
Compress PDFs below 10 MB to meet common email attachment limits.
Flatten forms before sharing
Convert interactive PDF forms to flat PDFs to prevent recipients from editing them.
Everything you need to know about processing files with this tool.
You can merge up to 20 PDFs in one operation.
Yes. Drag and drop the files in your preferred order before clicking Merge.
Yes. All processing happens in your browser. Your PDF never reaches our servers.
The tool supports files up to 50 MB.
Password-protected PDFs must be unlocked before processing.
Common questions from people using this type of tool.
Merge PDF on PXEL is a fast, free option that runs entirely in your browser. No software installation or account is required.
Yes. Merge PDF runs directly in your web browser using the Canvas API and WebAssembly. Nothing needs to be installed.
Yes. The tool runs in mobile browsers on iOS and Android without any app download.
Yes. There are no hidden fees, no daily limits, and no account required. Every tool on PXEL is free to use.
Merge PDF outputs files in PDF format. You can select the format in the tool options.
Processing is nearly instant for most files. Very large files (50 MB) may take a few seconds depending on your device.
Files never leave your browser
All processing uses the Canvas API and WebAssembly locally. Nothing is uploaded.
Instant processing
No server round-trips. Results are ready the moment processing finishes.
Works on all devices
Desktop, tablet, and mobile browsers are all supported. No app required.
Free forever, no limits
No account, no subscription, no daily caps. Every tool on PXEL is free.
No uploads
Your files are processed in memory. They are never stored, logged, or shared.
Last updated: 2025-06
Tool and content kept current to reflect best practices.