Merge PDF

What this does

It puts several PDFs together into one file, in the order you choose. A form and its attachments, a contract and its signed pages, a scanned receipt behind an invoice — whatever has to arrive as a single document.

The files never leave your device. That matters more for PDFs than for almost anything else people put online: the documents that need merging are usually the ones with a signature, an account number or a passport scan in them.

How to use it

1. Choose the PDFs. You can pick several at once, and add more afterwards.
2. Check the list: each file shows its number of pages and its size.
3. Move files with Up and Down until the order is right, or remove one.
4. Press Merge, then download merged.pdf.

What comes across, and what does not

Every page is copied as it is: its text, its fonts, its images and its drawings. Nothing is flattened into a picture, so text stays selectable and searchable, and the pages look exactly as they did.

Some things belong to a document rather than to its pages, and those stay behind: the bookmarks in the sidebar, fillable form fields, and the title and author in the document's properties. Links to websites keep working. A link that jumps to another page of its original document may not, because that page is now part of something else.

Why there is no "compress PDF" here

It is the most searched PDF task, and this site does not offer it, because a browser cannot do it honestly with the tools it has. Most of a PDF's weight is its images. Putting pages into a new file copies each image byte for byte, so a "compressed" file comes out the same size — measured, on an image-heavy document, at 0.00% saved. A page that offered to compress and handed back the same bytes would be doing nothing while appearing to work.

The honest route is to shrink the pictures before they go into the PDF. For a photo or a scan, the Image Compressor does that in your browser too.

Password-protected PDFs

A PDF with a password cannot be opened here, and this page says so by name rather than producing a broken file. Remove the password in the app that set it — most PDF readers can save an unprotected copy once you have entered it — then add the file again.

Nothing is uploaded

Your browser reads the files, puts the pages together and saves the result. Nothing is sent anywhere, and the test suite for this page records the requests the tool makes while files are processed and fails if one of them could carry a file.