Merge PDF

How to merge PDF files

1. Drop your PDF files on the drop zone, or click it to choose them. You can add more files at any time; they are added to the end of the list.
2. Put the files in the right order. Drag a file by its handle (⠿), or use the Move up and Move down arrow buttons, which also work with the keyboard. The Remove button (✕) takes a file out of the list.
3. Optionally, type in the Pages field of a file to keep only some of its pages, for example 1-3, 5. Leave it empty to keep every page (the field shows All).
4. Click Merge PDF. When the new document is ready, the tool shows its number of pages and its size.
5. Click Download to save merged.pdf. Use Clear to start over with a new set of files.

What the merge does

The tool builds a brand-new PDF and copies each page into it, one file after the other, in the order of the list. Pages are copied as they are: text stays selectable and searchable, vector graphics stay sharp, and images are not recompressed, so there is no loss of quality. Page sizes and orientations are kept too, which means you can combine an A4 report with a US Letter form or a landscape spreadsheet printout without any page being stretched.

Choosing pages from each file

The Pages field accepts page numbers and ranges separated by commas:

• 5 keeps page 5 only;
• 1-3 keeps pages 1, 2 and 3;
• 8- keeps page 8 through the last page, and -4 keeps pages 1 to 4;
• 3, 1, 2 puts the pages in that order, and repeating a number repeats the page.

If a number does not exist in that file, the tool tells you which file and which entry is wrong before merging, for example “9”: this document ends at page 5.

Limits and good to know

• Password-protected or encrypted PDFs cannot be merged. This includes files that open without a password but forbid editing. Remove the protection in a PDF reader you trust, then add the file again. The tool shows a clear message instead of producing a broken file.
• Bookmarks and form fields. Page content, including links and comments, is copied, but the document outline (bookmarks) of the original files is not rebuilt, and fillable form fields may no longer be editable in the merged file.
• File size. The merged PDF is usually close to the sum of the originals. Fonts shared by several files are stored once per source file.
• Very large files are limited only by your device’s memory. A few hundred pages is fine on a typical computer; phones may struggle with several hundred megabytes.

Privacy

Everything happens in your browser, with JavaScript. Your PDFs are read from your device, merged in memory and saved back to your device. They are never uploaded to a server, which makes this tool suitable for contracts, invoices, medical forms or any document you would rather keep to yourself.