Merge PDF files
Several PDFs in, one PDF out — combined on your own device, in your order, without a single page going to a server.
Drop your PDF files here
or
Two or more PDFs — merged in order, no upload
🔒 Files never leave your device — everything runs in your browser.
Merging PDFs is the classic office chore: a contract and its annexes, scanned pages from different sittings, chapters exported one by one — and a recipient who wants a single file. Most online mergers make you upload documents that are precisely the kind of thing you should not be uploading anywhere.
ConvertUno merges entirely in your browser: select your PDFs together or drop them in one go, and they are combined in that order with every page carried over exactly as it was. No upload, no queue, no page limit — a 300-page merge is as private as a two-page one. Password-protected PDFs are the one exception: they need unlocking first, and the tool tells you clearly instead of failing silently.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Run the tool
One click does the work for merge pdf — pages are processed right in your browser, in order.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
How do I control the order of the merged file?
The files merge top to bottom, exactly as listed under the dropzone. Use the arrows next to each file to reorder, the × to drop one out, and pick more files at any point — they join the end of the list.
Are pages recompressed or changed in quality?
No — merging copies each page's content untouched into the new file. Text stays text, images keep their original quality, and the merged PDF is roughly the size of its parts combined.
Why does my password-protected PDF fail?
Encrypted PDFs cannot be read without their password, so the tool reports them clearly rather than producing a broken file. Unlock the document in your PDF reader first (open it with the password and save a copy), then merge.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.