Merge PDF files without uploading them
Combine PDFs into one document right in your browser. Nothing is sent to a server, and form fields and internal links survive the merge.
Free forever · Runs on your device · 0 bytes uploaded
Drag files to reorder, or use the arrows.
Speed depends on your device; big files on phones take longer. Slow or not working? Report it on GitHub
How to merge PDF
- Add two or more PDF files — drag them in or click to choose.
- Put them in order with the ↑ and ↓ buttons.
- Click “Merge PDFs” and download the combined file.
Also good for
- combine PDF files into one
- merge PDF without uploading
- join PDF files online free
- merge scanned PDFs
- merge PDF on phone
Private by design — and you can check
Your files are never uploaded, because there is nowhere to upload them to.
- No upload step existsFiles are read and written inside this browser tab. There is no server that could receive them.
- The browser enforces itThis page’s Content Security Policy only allows connections back to this site, which serves nothing but the app itself.
- See for yourselfOpen developer tools, watch the Network tab and run a job: no request carries your document.
- Open sourceEvery line is on GitHub, built on qpdf, pdf.js & pdf-lib.
Frequently asked questions
Are my files uploaded anywhere?
No. Fizzdoc does the work inside your browser tab, using open-source engines compiled to WebAssembly and JavaScript. Your file is read from your device, processed locally, and the result is saved straight back to your device. You can check this yourself: open your browser’s developer tools, go to the Network tab, and run a job — no request carries your file.
Will bookmarks, form fields and links survive?
Form fields and internal links from every file are kept. Bookmarks from the first file are kept; bookmarks from the other files cannot be combined yet, and Fizzdoc tells you when that happens instead of dropping them silently.
Can I merge password-protected PDFs?
Yes. You are asked for the password on your device, and the merged file is saved without a password.
Is there a size limit?
There is no page limit. The size limit depends on your device’s memory — usually several hundred megabytes in total — and Fizzdoc tells you before starting if a job is too large for your device.
Is Fizzdoc free?
Yes, and it stays free: no sign-up, no watermark, no daily limit and no premium tier. Fizzdoc is open source under the Apache-2.0 license, so anyone can run their own copy.
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