Are my PDFs uploaded anywhere?

No. Merging happens entirely in your browser with pdf-lib — your files never leave your device, and there's no watermark or signup.

Will the quality change?

No. Pages are copied as-is with no re-compression, so the merged PDF is identical in quality to the originals.

Yes — reorder the files before merging; the on-screen order is the order of pages in the final PDF.

Merging tries to open files even if lightly protected, but fully encrypted PDFs can't be merged until you remove the password.

No fixed limit — it's bounded only by your device's memory. Very large files just take a little longer.

Combine multiple PDF files into one, in the order you choose — right in your browser, nothing uploaded.

Processed 100% in your browser — nothing you enter here is ever uploaded.

Merge an invoice, a contract and an appendix into a single PDF before sending.

Join separately-scanned PDF pages into one clean document.

Put multiple PDF reports together so recipients get one file instead of many.

Drop your PDF files into the box, or click to browse. Everything runs in your browser — the files are never uploaded.

Reorder the files if needed — the order shown is the order they'll be merged in. Remove any you don't want.

Click "Merge PDF" and download the single combined file.

Pages are copied exactly as they are — no re-compression, no quality loss, no watermark.