Bum Bum's toolbox
All your PDFs. One PDF.
The contract is in one file, the signed page in another, the appendix in a third. Bum Bum stitches them into a single PDF right in your browser, in the order you choose. Your files never leave your device. One action per merge.
Pick some PDFs
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Drop PDFs here, or pick them below. Two or more makes a merge.
Questions, answered
Do I need an account?
No. Merge as a guest with 15 free actions, or create a free account for 75 actions every month. See pricing.
Do my PDFs upload anywhere?
No. Your files never leave your device. Merging happens right in your browser.
Does merging reduce the quality of my PDFs?
No. Pages are copied into the merged file exactly as they are, with no re-compression and no quality loss.
Can I change the order before merging?
Yes. Use the up and down buttons on each file to arrange the order, then merge.
Why did one of my PDFs fail?
Usually because it is password-protected or damaged. Unlock it with the password in your usual PDF app, save an unprotected copy, and drop that in.
Merging PDFs, the short guide
How it works here
Most online mergers upload your PDFs to a server and combine them there. This one does the combining in your browser: you drop the files, arrange them, and the merged PDF is built on your own device from the pages of the originals. Pages are copied, never rebuilt as images, so text stays sharp and searchable and the quality is exactly what went in. Nothing is uploaded, kept, or seen by anyone else.
The order a reader expects
Main document first. Supporting files follow in the order the main document mentions them, signed pages sit where the signature belongs, and appendices go last. The first-page preview on each row shows you what you are arranging, so the merged file reads like one document instead of a pile of attachments.
Merge, or keep the files separate?
Merge when the destination wants one document: a job application, a client packet, a signed contract with its schedules, an archive you will search later. Keep files separate when different people need different pieces, or when some of the pieces are still being edited and would force a re-merge every round.
More tiny tools
PDF to Image - Turn every page of a PDF into a JPG, PNG, or WebP image.
Image Converter - WebP to PNG, JPG to WebP, whatever to whatever, right in your browser.
Video Converter - Convert a video to MP4, WebM, or animated GIF without uploading it.