Merge two or more PDF files into one, in the order given. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Split a PDF by 1-based page ranges (one output file per comma group, e.g. "1-3,5"), or extract specific pages into a single PDF (e.g. "1,3,5"). Provide exactly one of ranges or pages. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Rotate pages by a multiple of 90 degrees. Omit pages to rotate every page. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Stamp a text watermark on every page. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Stamp sequential Bates numbers ({prefix}{zero-padded n}) on every page. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Strip document metadata: clears title, author, subject, keywords, creator and the CreationDate/ModDate in the info dictionary, AND deletes the document-level XMP metadata stream (the copy Acrobat/Word/InDesign write). Note: pdf-lib rewrites /Producer with its own signature on save, so that one field is replaced rather than emptied. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Return the number of pages in a PDF. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Rebuild a PDF keeping only the pages you list, in the order you list them. Reordering, deleting and duplicating are all the same operation: a page you omit is dropped, a page you move is reordered, and a page listed twice is duplicated. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Remove the listed pages, keeping everything else in its current order. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Stamp readable page numbers on each page. Distinct from Bates numbering: these are a reading aid (centred, optional "of N" total, skippable cover), not a legal evidence-control device. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Trim the visible area of each page by the given margins, in points (72 = 1 inch). This sets the CropBox, so the trimmed content is HIDDEN, not removed — it stays in the file and anyone can restore it. Cropping is not redaction. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Paint filled form values onto the page as static content. Afterwards the answers are still readable but can no longer be edited, cleared, or extracted as form data. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Build a PDF from PNG and/or JPEG images, one image per page, in the order given. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Encrypt a PDF with AES-256 so it cannot be opened without the password. Only AES-256 is offered — 40-bit and 128-bit are classed as weak crypto. The password is used locally and never transmitted; it also cannot be recovered, so it must be stored somewhere safe. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Decrypt a password-protected PDF you know the password for, so it opens without prompting. This does NOT recover, guess, or brute-force a forgotten password. Runs entirely on this machine — the file is read and written locally and never sent anywhere.