Watermark PDFの使い方
- 1
Add your PDF
Drop the PDF that needs a watermark, up to 50 MB and 200 pages long. The first page opens as a live preview of the watermark.
- 2
Write the text or pick a logo
Type words such as DRAFT or CONFIDENTIAL, or switch to Image and choose a PNG, JPG, WebP, GIF or SVG file.
- 3
Set the look and the place
Change opacity, angle, size and colour, pick one of nine positions or repeat the mark across the page, and choose whether it sits on top of the content or behind it.
- 4
Choose pages and save
Stamp all, odd, even or listed pages, then press Add watermark to download name-watermarked.pdf.
制限と Pro
One PDF of up to 50 MB and 200 pages per run; logo images up to 20 MB.
Pro watermarks documents of up to 5,000 pages and 4 GB. Pro を見る
Watermark PDF について
Add watermark puts a visible mark on the pages of a PDF: a word or two such as DRAFT, CONFIDENTIAL or COPY, a name and a date, or your company logo. It's the quickest way to label a document that is still under review, to show who a copy was made for, or to discourage passing a file around as if it were the final version.
A text mark can run over several lines, in Helvetica, Times or Courier, bold or regular, in any colour, from 8 to 160 points. An image mark accepts PNG, JPG, WebP, GIF and SVG files; transparent PNGs look best because only the logo itself is printed. Opacity goes from barely visible at 5% to solid, and the angle from −90° to 90°, with the classic 45° diagonal one click away. Place the mark in one of nine spots, or tile it across the whole page so that a simple crop can't cut it out.
The On top layer puts the mark over everything, while Behind tucks it under the page's text and drawings, which keeps the words easy to read but hides the mark wherever the page is filled, as on scans. Text watermarks stay real text, so they print crisply, and the rest of the file keeps its bookmarks, links and forms. A watermark is a visible label, not a lock: someone with a PDF editor can remove it, so add a password to documents that must stay private.
プライバシー
The watermark is drawn by pdf-lib in a Web Worker and previewed with PDF.js, both inside this browser tab, so neither your PDF nor your logo is uploaded. A font is fetched from jsDelivr only when the text needs letters outside the Western European set, and that request contains no document data.
主な機能
Text or logo
Several lines of text in three font families, or a PNG, JPG, WebP, GIF or SVG image.
Opacity and angle
Anything from a faint 5% to solid, at any angle between −90° and 90°.
Nine spots or a tiled pattern
Place one mark precisely, or repeat it across the whole page.
Over or behind content
Stamp on top of the page, or underneath so the text stays readable.
Only the pages you choose
All, odd, even or a typed list of pages.