Merge, split, rotate, add page numbers and compress PDFs without uploading them to a server.
Combine multiple PDFs into one in the order you choose.
Extract pages by range or split every N pages.
Rotate pages and add page numbers before sharing.
Most PDF problems are one of four jobs, and picking the wrong tool is what makes them feel hard.
Compress when a file is too large for an upload limit. Nearly all of a PDF's weight is its images, so compression works by re-encoding those at a lower resolution and quality. Text stays sharp because text is stored as instructions, not pixels. If your PDF is mostly text and still enormous, it is probably a scan, which means every page is secretly a photograph.
Split when you need particular pages, and merge when a form wants one file and you have several. Both rewrite the document structure without touching the page content, so neither costs any quality.
Convert when the other side needs a different format, and accept that conversion out of PDF is approximate. A PDF records where marks sit on a page, not the paragraphs and styles a word processor works in, so turning one back into an editable document is reconstruction rather than translation. Expect to fix the layout.
Everything here happens inside the page, using your own machine. The file is never uploaded, which matters because PDFs tend to be the documents people least want on someone else's server: bank statements, certificates, identity papers, signed contracts.
There is one deliberate exception. Very large PDFs, past about 30 MB, can exhaust the memory a browser tab is allowed, so those can optionally be sent to our server to be compressed with Ghostscript instead. That path is opt-in and never automatic. You are told before anything leaves your device, and the job is deleted afterwards.
If a document needs a password rather than a smaller size, use Encrypt PDF. It applies real AES-256 encryption in your browser. Worth knowing before you rely on it: a PDF has two different passwords, and only the one that stops the file opening is genuine security. The permissions password, which blocks printing or copying, is a flag that readers are asked to respect and many simply ignore.
A password-protected PDF also cannot be compressed or merged until the password is removed, because a tool cannot read a file it cannot open. Do any editing first and encrypt last.