How do I add a watermark to a PDF online?

Upload your PDF document in the box above, type your custom watermark text (e.g., 'CONFIDENTIAL' or 'DRAFT'), adjust the color, transparency, and angle, then click 'Apply Watermark Now' to download your protected file.

Can I adjust watermark transparency and color?

Yes. You can select from curated color presets, customize font size, and set opacity so the watermark protects your content without obscuring document readability.

Is the watermark applied to every page?

Yes. PDFLOL stamps your designated watermark consistently across all pages in the document.

Are my documents kept private?

Yes. All watermarking is rendered client-side in your browser via WebAssembly. Your files are never uploaded to any remote server.

Is it free to watermark PDF files on PDFLOL?

Yes, PDFLOL provides free, unlimited watermarking with zero subscriptions and no account creation required.

PDF 添加水印

在每页 PDF 上添加自定义保密水印或品牌标识。

选择 PDF 文件

从电脑或手机中选择 PDF 文件