Merge PDF files online
Combine multiple PDFs into a single document. Drag and drop to reorder, then download instantly. 100% local — your files never leave your browser.
Drop PDF files here or browse
PDF files only · Max 100 MB
100% secure
Your files are never shared
Ultra-fast
Processing in seconds
Privacy
Automatic deletion after 1h
How to merge PDF files online
Upload your PDFs
Drag and drop your PDF files into the upload area, or click to browse. You can select multiple files at once.
Reorder if needed
Drag the files in the list to arrange them in the order you want. The first file will be page 1 of the merged document.
Merge and download
Click the Merge button. The combined PDF is generated instantly in your browser, then click Download to save it.
Why merge PDFs?
Merging PDFs is useful when you need to combine related documents — such as invoices, contracts, reports, or scanned pages — into a single file for easier sharing and archiving.
Instead of sending multiple attachments, a single merged PDF is cleaner, faster to open, and less likely to get lost.
How does client-side merging work?
Unlike most online PDF tools that upload your files to a remote server, AwesomeToolkit uses pdf-lib — a JavaScript library that runs entirely in your browser. When you drop your PDFs, they are read into your browser's memory, combined locally, and the result is generated on your device.
This means zero upload time, zero server dependency, and complete privacy. Your files never leave your computer — not even for a millisecond.
Tips for merging PDFs
- •Arrange files in the desired order before merging — the tool preserves the exact sequence you set.
- •If you need to remove specific pages from one file before merging, use our Split PDF tool first to extract only the pages you need.
- •Very large PDFs (50+ MB each) may take a few seconds to process depending on your device. Modern browsers handle this well.
- •The merged file retains all bookmarks, links, and form fields from the original documents.
- •After merging, consider compressing the result with our Compress PDF tool to reduce file size for sharing.
Common use cases
- •Combine invoices or receipts into a single monthly report.
- •Merge scanned pages into one complete document.
- •Assemble contract pages, appendices, and cover letters.
- •Collect student assignments or form submissions into one file.
- •Prepare a portfolio or presentation from separate PDF slides.
Privacy and security
Your PDFs are processed 100% locally in your browser — they are never uploaded to any server, not even temporarily. This tool uses pdf-lib, a JavaScript library that runs entirely on your device. Your files never leave your computer.
Unlike most online PDF tools that require server uploads, AwesomeToolkit processes everything client-side. Once you close or refresh the page, all data is cleared from memory. No file is stored, logged, tracked, or accessible to anyone — ever.
Merge PDF files online — Frequently asked questions
How many PDFs can I merge at once?
You can merge up to 20 PDF files at once, each up to 100 MB. There is no limit on the total number of pages.
Can I reorder the files before merging?
Yes! Simply drag and drop the files in the list to reorder them. The final merged PDF will follow the order you set.
Is the merge done on a server?
No — the merge is done entirely in your browser using pdf-lib. Your PDF files are never uploaded to any server. Everything stays on your device.
Will the merged PDF keep the original quality?
Yes. Merging is a lossless operation — all pages, images, fonts, and formatting are preserved exactly as they are in the original files.
What is the maximum file size?
Each individual file can be up to 100 MB. Very large files may take a few seconds to process depending on your device.
Can I merge password-protected PDFs?
The tool attempts to open encrypted PDFs, but some password-protected files may not be readable. Remove the password before merging if you encounter issues.
What format is the output file?
The output is a standard PDF file named merged.pdf. You can rename it after downloading.
Does it work on mobile?
Yes, the tool is fully responsive and works on smartphones and tablets. You can upload files and download the merged result on any device.
Is an internet connection required?
Only to load the page. Once the tool is loaded, the merge runs entirely offline in your browser — no data is sent over the network.
Are my files stored anywhere?
No. Your files exist only in your browser's memory during the session. Once you close or refresh the page, everything is gone. We have zero access to your documents.