Merge PDF
To merge PDF files, add them below in the order you want them combined: pdf-lib joins them in your browser into a single PDF you can download. The files are never uploaded.
About the Merge PDF tool
You can merge PDF files entirely in your browser — no software to install, no file upload, and no account required. The conversion runs on the pdf-lib and pdf.js libraries, running as plain JavaScript directly on your device.
Common uses
- Combining a cover letter, CV and certificates into one application file
- Joining scanned pages that were saved as separate PDFs
- Putting together invoices or reports for one submission
How merging works
Pages are copied into the new PDF exactly as they are — text stays selectable and nothing is re-compressed, so there's no quality loss. Files are merged in the order you add them; remove one with its × button and add it again to change the order.
Each file can be up to 200MB. Document-level extras such as bookmarks may not carry over.
How to merge PDF files privately
Every step below runs on the pdf-lib and pdf.js libraries, running as plain JavaScript inside this browser tab. Your .pdf file is never uploaded to a server — there's no network request carrying it anywhere.
Add your PDF files
Drag and drop, or click to select, your files (.pdf). They're read straight from disk into browser memory — no upload step exists.
Merge locally
FreePrivateConvert does this with the pdf-lib and pdf.js libraries, running as plain JavaScript, entirely within this browser tab.
Download the result
Save your new file. It only ever existed in this tab's memory — closing the tab without downloading discards it completely.
Troubleshooting
- "File isn't a valid PDF (or is password-protected)"
- Password-protected PDFs can't be merged. Open the file in a PDF reader, save an unprotected copy, and add that instead.
- Files are in the wrong order
- Remove the misplaced file with its × button, then add it again — new files go to the end of the list.
FAQ
- Are my files uploaded anywhere?
- No. Your files are read and processed inside this browser tab and never leave your device. You can confirm it in your browser's developer tools: the Network tab shows no upload.
- Does it reduce quality when you merge PDF files?
- No. Pages are copied into the new PDF exactly as they are: text, images and vector graphics are not re-encoded. Document-level extras such as bookmarks may not carry over.
- Is there a file size limit?
- Yes: 200MB per file, and you can add several files at once. There's no account and no limit on how many files you convert.
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