Merge PDF files online - combine multiple PDFs into one

Pages are copied from each file into a new document with the pdf-lib library, running locally in your browser. Text, vector graphics and fonts are carried over unchanged, so text in the merged file stays selectable and searchable and quality is not reduced - nothing is re-rendered or re-compressed.

Because nothing is uploaded, it is safe to merge contracts, invoices or scanned IDs. Speed depends on your device: a dozen short files merge in a fraction of a second, a file of several dozen MB takes a few seconds.

The result contains every page of every file, in list order. Above the button you see a “Pages in result” counter, calculated before merging: each PDF adds its own page count and each image adds one page.

Example: a contract (3 pages) + an amendment (1 page) + 2 photos of a receipt = 3 + 1 + 2 = 6 pages. If the amendment belongs at the end, move it down with the arrow before clicking “Merge files”. You need at least two files to merge.

The tool always merges whole files. To keep only some pages, extract them first or remove unwanted pages afterwards in a page organiser.

Besides PDFs you can add JPG and PNG images (WebP, GIF, BMP and AVIF work too). Each image goes on its own A4 page: orientation follows the picture (portrait or landscape) and the image is scaled proportionally with a 10 mm margin. JPG and PNG files are embedded without re-compression; other formats are converted to JPEG first.

If you need a different page size or margins for photos, convert them in a dedicated image-to-PDF tool and then merge the result here.

Encrypted PDFs cannot be merged because the browser library cannot decrypt them. The tool flags such files, as well as damaged or non-PDF files, so you can remove them from the list. Remove the protection first (for example open the file with its password and re-save it using “Print → Save as PDF”), then add it again.

• The output is roughly the sum of the input sizes - compress it if it is too big for email.
• Bookmarks, form fields and other interactive elements are not carried over; the result keeps the look of the pages.
• The practical limit is your device memory, not a server quota.