Merge PDF
Combine multiple PDF files into a single document in seconds.
Combine PDFs without uploading them
Select two or more PDF files and get back a single merged document with all pages in order. Unlike most online mergers, this one runs entirely in your browser using the pdf-lib library — your documents are never uploaded to a server, which matters when merging contracts, ID proofs, bank statements or medical records.
Everyday uses
Applications: combine your form, photo page, ID proof and certificates into the single PDF that portals demand. Invoicing: merge a month of invoices into one file for your accountant. Study material: stitch lecture-note PDFs into one searchable document. Scanning: phone scanners often produce one PDF per page — merge them into the real document.
Order matters
Files are merged in the order you select them. If your file picker sorts alphabetically, a quick rename (01-form.pdf, 02-id.pdf, 03-marks.pdf) guarantees the right sequence.
About file size
The merged PDF is roughly the sum of its parts. If the result is too large for an upload limit, run it through our Compress PDF tool afterwards — merging first, compressing second usually gives the best result.
Frequently asked questions
Are my PDFs uploaded to your server?
No — merging happens entirely in your browser. This is safe even for sensitive documents like ID proofs and bank statements, because the files never leave your device.
How many PDFs can I merge at once?
There is no fixed limit — it depends on your device's memory. Dozens of typical documents merge without issue; very large scanned books may need to be merged in batches.
Can I control the page order?
Files merge in selection order. Rename files with number prefixes (01-, 02-, 03-) before selecting to guarantee the exact sequence you want.
Does merging work with password-protected PDFs?
Encrypted PDFs need to be unlocked first — open the file with its password and re-save an unlocked copy, then merge.