Combine PDF files
Merge PDF
Merge multiple PDF files into one PDF in your chosen order.
Browser processing · no file upload to our server
Drag a PDF here or click to upload
PDF · 50MB each · 150MB total
Processed in your browser · no server upload
Core Options
Adjust only what you need.
PDF merge needs at least 2 PDF files.
How to use Merge PDF
Combine contracts, proposals, attachments, and document parts into a single PDF directly in your browser.
Recommended workflow
- 1.Upload at least two PDFs.
- 2.Check file order and output name.
- 3.Run merge and download the result.
Merge PDF output checks
- Check the first and last pages for missing content.
- Verify page order and orientation.
- Open the downloaded file and keep your originals separately.
Processing method
Pages are copied into a new document in file order. Merging does not edit page contents or run OCR.
How files and inputs are handled
This tool processes files and inputs in the current browser. OneClickTool does not receive or store the original content on its own server.
Frequently Asked Questions
Can I reorder PDFs before merging?
Yes. Arrange the uploaded list, then merge files in that order.
How many PDFs can I merge?
Up to 20 files are recommended for browser stability. Large PDFs may take longer.
Is the merged PDF uploaded to a server?
No. Merging runs in your browser and the result is saved only when you download it.
Supported Scope
Merge and split PDFs, create PDFs from images, convert pages to high-resolution JPG, and extract embedded images.
Encrypted, permission-restricted, or very large PDFs may fail because of memory limits.
Related Guides
Check the criteria before using the tool to review results faster.
PDF TasksImages to PDF
Turn JPG, PNG, or WebP images into one PDF while controlling page order, orientation, margins, readability, and output size.
PDF TasksMerge and Split PDFs
Combine PDFs in the correct order or extract only the pages you need while protecting private information and checking the final file.