Overview: Merge PDF files online for free. Runs entirely in your browser via pdf-lib — no upload, no server, no sign-up, no watermark. Works on any device.
Merge PDF Files Online — Free
Runs in your browser. Files are never uploaded to a server.
Choose two or more PDF documents to combine. They stay on your device.
2. Merge
Your browser combines the pages locally — nothing leaves your device.
Local only
Processed in your browser's memory. Nothing is uploaded — check your Network tab yourself.
No queue
No upload/download round trip, so it starts immediately.
Any modern browser
Works on Chrome, Firefox, Safari, and Edge — desktop or mobile.
How PDF merging works on PDFTeq
This tool uses pdf-lib, an open-source JavaScript library, to read each selected file directly into your browser's memory, copy its pages into a new document, and generate the merged file — all on your device. No file is sent to any server at any point. You don't have to take our word for it: open your browser's developer tools (F12), switch to the Network tab, and run a merge. You'll see no upload request for your PDF content.
When people use this
- Students: combining assignment sections, scanned notes, or a thesis and its appendices into one submission.
- Small business: assembling an invoice, quote, and terms into a single client-ready document.
- Admin work: merging scanned forms, ID copies, or travel bookings into one file for email or upload elsewhere.
Good to know before you merge
- Page order follows the order you select files in — reselect in the correct sequence if needed, since this version does not support drag-to-reorder yet.
- Very large files (roughly 1GB+) depend on your device's available memory; older phones may struggle where a laptop won't.
- Password-protected PDFs aren't supported yet — unlock the file first, then merge.
- Output quality is unchanged: pages are copied, not recompressed or re-rendered.
Frequently asked questions
Is merging PDFs with PDFTeq really free?
Yes. There is no sign-up, no watermark, and no file-count limit. The tool runs in your browser and costs nothing to use.
Are my files uploaded to a server?
No. The merge happens entirely in your browser using the pdf-lib JavaScript library. Your files are read into browser memory and never sent over the network. You can verify this yourself by opening your browser's developer tools, going to the Network tab, and merging a file — no upload request will appear.
Is there a file size limit?
There is no artificial limit set by PDFTeq. The real limit is your device's available memory, since everything is processed locally. Most laptops and desktops handle typical multi-hundred-page merges without issue; very large files (over roughly 1GB) may be slow or fail on low-memory phones.
Can I merge password-protected PDFs?
Not currently. If a file is password-protected, remove the password first using a PDF reader that supports decryption, then merge the unlocked file.
Will merging reduce the quality of my PDF?
No. Pages are copied into the new file as-is; they are not re-rendered, rasterized, or compressed during a merge.
Does this work without an internet connection?
You need an internet connection to load the page and the pdf-lib script the first time. Once loaded, the merge itself does not require network access.