PDF watermark

Client

Text on every page—see also Image watermark.

About PDF watermark

Add diagonal text to every PDF page in the browser—download a labeled copy without upload. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

Max 25 MB. Processed locally.

Nearby workflows on Toolcore

  • Compress PDF — Best-effort PDF shrink by re-saving in the browser—not server OCR or Ghostscript; see size before/after. after you download or inspect a PDF on this page.
  • Merge PDF — Combine multiple PDF files in order—one download; processing stays in your browser. after you download or inspect a PDF on this page.
  • Image text watermark — Overlay semi-transparent text on PNG or JPEG with canvas—position, opacity, and size—local only. after you download or inspect a PDF on this page.
  • PDF tools — Hub for browser PDF utilities—merge, split, convert, edit pages, and extract text. after you download or inspect a PDF on this page.

Common use cases

  • Mark draft PDFs CONFIDENTIAL or DRAFT before internal review.
  • Add a light review label across every page of a merged document.
  • Watermark exports before sharing outside your org (policy permitting).

Common mistakes to avoid

  • Expecting image/logo watermarks

    Text only—use image watermark for PNG/JPEG assets.

  • Password-protected PDFs

    Encrypted files may fail to load—unlock elsewhere first.

FAQ

Is the PDF uploaded?

No. pdf-lib runs in your browser tab.

Can I change position?

Currently centered diagonal text on each page with adjustable label string.

More tools

Related utilities you can open in another tab—mostly client-side.