Merge PDF
Combine multiple PDFs into one file, in exactly the order you arrange them. Nothing is uploaded — merging happens entirely in your browser.
No files added yet.
Processed locally. Your files never leave your browser.
How it works
Files are combined in exactly the order shown in your list — use the up/down arrows to rearrange them before merging. Nothing is uploaded: your browser reads each PDF and rewrites it structurally into one file, the same way every PDF tool on Kelvido works.
Common questions
Is there a limit on file size or number of files?
Yes. You can merge up to 30 PDFs at once, totaling up to 150MB combined, producing a merged file of up to 1,500 pages. These limits exist because merging runs entirely in your browser rather than on a server — very large jobs can run out of memory instead of failing gracefully.
Does merging reduce PDF quality?
No. Merging only rewrites the file structurally to combine pages into one document — nothing inside the pages is re-rendered, re-encoded, or re-compressed, so there's no quality loss.
Can I remove or reorder individual pages, not just whole files?
Within this tool you can reorder and remove whole files before merging (using the up/down and remove controls), but not individual pages inside a file. For that, merge first, then use Delete PDF Pages on the result — or use it beforehand on any file that needs trimming.