FileGizmo — PDF tools
Add a watermark to a PDF
Add configurable diagonal text to every PDF page or selected page ranges locally.
Unlimited edits. No daily tasks. Your work survives a crash. Your file still never leaves.
Processing locally…
Your file is ready
Simple by design
Watermark PDF in three steps
Add a clear diagonal text watermark to contracts, drafts, previews, internal reports, or review copies without sending the PDF to a server. Enter text such as CONFIDENTIAL, DRAFT, or a recipient name, then choose its size and opacity. Apply it to every page or target ranges such as 1-3, 8.
FileGizmo centers and rotates the watermark across each selected page while respecting different page dimensions. The original PDF content remains intact and selectable because pages are not rasterized. The watermark is embedded as page content using a standard PDF font, keeping the output broadly compatible without loading external font files.
Processing happens entirely inside a dedicated browser worker. The source document and watermark text stay on your device, and no account is required. Password-protected PDFs must be unlocked first. Watermarks discourage casual redistribution and clarify document status, but they are not digital-rights management; advanced PDF editors may still alter page content.
- 1
Choose an unlocked PDF
- 2
Enter watermark text and select pages and appearance
- 3
Apply and download the watermarked PDF
Good to know
Frequently asked questions
Can I watermark selected pages only?
Yes. Enter page ranges or leave the field blank to watermark every page.
Can I control the appearance?
You can choose small, medium, or large text and light, medium, or strong opacity.
Does watermarking upload my PDF?
No. Text is drawn into pages inside a local browser worker.
Is the watermark permanent?
It becomes part of the PDF page content, though specialized PDF editors may still modify content.