Edit PDF

This group contains five tools for changing how a PDF presents itself: page numbers, a text watermark, cropped margins, document metadata, and an encryption check. Files are read and rewritten in the browser, and no password or content is sent to a server.

What each tool changes

• Add Page Numbers — draws a number on all, even, or odd pages, with six positions, three formats, a custom starting number, 6–72 pt font size, and an 8–144 pt edge margin.
• Watermark PDF — draws text at the page centre with 8–200 pt size, 0.05–1 opacity, −90° to 90° rotation, and four colours.
• Crop PDF — removes a chosen number of millimetres from the top, bottom, left, and right of every page.
• Edit PDF Metadata — updates Title, Author, Subject, and comma-separated Keywords, leaving blank fields unchanged.
• PDF Password Checker — reports whether the file declares encryption or requires an open password, without attempting to remove it.

Units and visual results

Page numbers and watermarks use points: 28 pt is about 9.9 mm, and 72 pt is one inch. Cropping uses millimetres, where 1 mm equals 2.8346 pt; a 10 mm trim removes 28.346 pt from that edge. A watermark is visible text, not a security control: it can be covered, cropped, or removed by another editor. Cropping reduces the visible area but may leave the hidden content inside the file, so it should not be used to conceal confidential material.

Typical document tasks

A legal bundle can be numbered from a chosen starting page. A review draft can carry a diagonal DRAFT mark at 15% opacity. A scanned report can lose its 10 mm scanner border. A file exported with a meaningless internal title can be renamed for document management. A protected file can be identified before it enters a workflow that cannot open encrypted input.

Order of operations

When several changes are needed, organize pages first (merge, split, extract, delete), then apply numbering, watermarking, or cropping, and update metadata last. That order avoids numbering pages that will later be removed and prevents a watermark from being cropped away at the edge.

After export, open the result in a PDF reader and check it at print scale. A page number that looks clear on screen can sit too close to a printed edge, and a 45° watermark can collide with a wide table. Adjust the margin or font size and run the operation again on the original file rather than on the already-stamped copy.

Limits

These tools do not edit body text, fill forms, redact content, or remove passwords. A PDF that requires an open password cannot be read until an unlocked copy is saved in a PDF reader. Each operation produces a new download and leaves the original file untouched.