Merge and Split PDF Files

Most PDF tools on the web work the same way: they upload your file to their servers, process it there and hand back a download link. For a contract, a copy of an ID, a payslip, a medical report or an unsigned offer, that is a heavier decision than it looks. The document is no longer under your control, and how long it is kept, who reaches it and whether it is really deleted are things you know only on that site's word.

This page sends your file nowhere. The PDF you choose is read into your browser's memory, the merging and splitting are done in JavaScript on your own computer, and the result downloads through a temporary link the browser itself creates. You can disconnect from the internet once the page has loaded and still use the tool from start to finish; not one step generates network traffic.

That has a second consequence: no queue, no size quota, no daily usage limit. Since no work is done on a server, there is no resource to defend. Close the tab and everything in memory is gone, leaving no record behind.

A PDF is not a text file with pages laid out one after another. Inside it are numbered objects: fonts, images, drawing instructions, metadata. The pages sit in a tree that points at those objects. Merging two documents is therefore not a matter of joining two files end to end.

The right way is to copy every object the source page depends on into the new document and renumber them. That is exactly what this tool does. Page content is never redrawn, re-compressed or turned into an image. A photograph that went in as a JPEG comes out as the same JPEG, text stays selectable text, and vector drawings stay vectors. Merging and splitting therefore cost no quality — because nothing is produced again.

The result is usually a little smaller than the sum of its parts. The reason is simple: when two documents using the same font are merged, that font is stored once in the target. Splitting works the other way round — every piece has to carry its own copy of the fonts it uses, so cutting a twenty-page document into twenty files can add up to more than the original.

You can select by clicking the thumbnails, and the expression in the box rewrites itself as you do. It works the other way too: type an expression and the thumbnails show you which pages it picked. The two always say the same thing.

When more than one file comes out, each is listed and can be saved on its own. Browsers block downloads after a few in a row, so multi-part results also get a “Download all as ZIP” button. The archive is built on your computer as well; since a PDF's contents are already compressed, the pieces go in uncompressed, which is why it finishes instantly.

A password-protected PDF is not opened. Decryption is left out on purpose: stripping a password undoes a decision the person who shared the document made, and turning that into a one-click browser tool is not the right thing to build. Pick such a file and the tool says so plainly, rather than quietly producing broken output.

Fillable form fields, digital signatures and bookmarks are not copied. They hang off the document as a whole rather than off a page, and carrying them into a new document usually breaks what they meant. A digital signature certifies the entire file as it stood when it was signed — the moment you remove a page from it, the signature stops being valid. That is not a shortcoming; it is how a signature works.

Page content is left alone as well: no text editing, no rotation, no watermarks, no compression. The tool only moves pages around. Keeping what it does small is what makes it predictable.