In short: Merging PDFs combines several PDF files into a single document in the order you choose, keeping every page’s text, images and quality intact.
About Merge PDF
Scanned receipts, a signed contract and its annexes, chapters exported separately — sooner or later you need several PDFs as one file. Most online mergers upload your documents to their servers to do this. Here the merge happens inside your browser using pdf-lib, an open-source PDF library, so the files never leave your device.
Pages are copied exactly as they are: text stays selectable, vector graphics stay sharp and the quality is not reduced. You can add files in several batches, reorder them with the arrow buttons and remove any you added by mistake before merging.
How to use Merge PDF
- Click the box or drop your PDF files onto it.
- Use the ↑ and ↓ buttons to put the files in the order you want.
- Press Merge PDFs.
- The merged document downloads automatically as
merged.pdf.
Examples
Merge report.pdf with six scanned receipts so your finance team receives a single attachment.
Combine cover letter, CV and certificates into one PDF, in exactly the order the employer asked for.
Frequently asked questions
Are my PDFs uploaded?
No. Merging runs locally in your browser with JavaScript. The files are not sent to SB Tools or anyone else.
Is there a file size or count limit?
There is no fixed limit. Practical limits depend on your device’s memory; merging a few hundred megabytes works on most computers.
Can I merge password-protected PDFs?
Encrypted PDFs must be unlocked first. The tool will tell you which file it could not open.
Will bookmarks and form fields be kept?
Page content, annotations and links are kept. Document-level bookmarks (the outline) from the source files are not combined in this version.
Updated November 2026 · Free, no signup · How we build and test tools