Merge PDF Files
Combine multiple PDF files into one document easily.
By Syed Mubashir Ali · Last updated
How to Use PDF Merger
- 1Drop your PDF files into the upload area, or click it to choose them. You can add more at any time.
- 2Each file appears as a card with a preview of its first page and its page count.
- 3Put the files in order by dragging the handle under each card, or with the arrow buttons.
- 4To merge only some pages of a file, type the pages in its card, e.g. '1-3, 5' — leave it blank to merge the whole file.
- 5Click 'Merge PDFs'.
- 6Click 'Download merged PDF'. The file is named after the first PDF in the list.
Frequently Asked Questions
How many PDFs can I merge at once?
There's no fixed limit; each file can be up to 100 MB. Files are read one at a time, so even a long list doesn't load everything into memory at once.
Will the merged PDF lose quality?
No. Pages are copied as they are, with their fonts, images and vector graphics untouched. Nothing is re-rendered or recompressed.
Can I merge only some pages of a PDF?
Yes. Each file card has a Pages box: type the pages you want, e.g. '1-3, 5' for pages 1, 2, 3 and 5, or leave it blank to merge the whole file. Pages are merged in the order of the files, and within a file in page order. A page number outside the file is flagged on the card so you can fix it before merging.
Are bookmarks and form fields kept?
No. Bookmarks (the outline) and fillable form fields belong to each original document rather than to its pages, and they aren't carried into the merged file. The pages themselves look exactly the same.
Can I merge password-protected PDFs?
Not directly. A password-protected PDF is encrypted, and the tool tells you so instead of producing a broken file. Open it in your PDF viewer with the password, use Print → Save as PDF to make an unprotected copy, and use that.
Is my data uploaded anywhere?
No. Everything happens in your browser; the file is never uploaded to a server, so it stays on your device.
Can I compress the merged PDF?
Yes. After merging, press Compress merged PDF. It runs the same engine as the PDF Compressor on its Recommended setting, which re-encodes photos to about 150 DPI and leaves text and drawings untouched, then shows the size before and after. If compression can't make the file smaller, you're told so and keep the original. For a hard limit such as 2 MB, use the PDF Compressor's Target size option instead.
How do I merge PDF files for free?
Upload two or more PDFs above, arrange them in the order you want by dragging the cards or using the arrows, and download the combined file. Free, no signup, no watermark, and your files never leave your device.
Can I merge PDFs and then split the result?
Yes — merge them here first, then split the combined file with the free PDF Splitter (linked on this page), into single pages, equal parts or your own ranges.
About PDF Merger
The PDF Merger combines several PDFs into one, in the order you choose. It is useful for bank statements going into a loan application, a report assembled from separate chapters, scanned pages saved as individual files, or a set of invoices for your accountant.
Every file shows a thumbnail of its first page and its page count, so you can check you have the right documents before merging. A file that can't be merged (damaged, not really a PDF, or password-protected) is flagged in red and has to be removed first, rather than quietly producing a broken result.
Merging runs in your browser with the open-source pdf-lib library. Pages are copied exactly as they are, so text stays selectable and images keep their original quality. Nothing is uploaded.