Add Watermark to PDF

Features

The PDF watermark tool supports adding text and image watermarks. Text watermarks use the browser's system fonts to render CJK characters natively; image watermarks support PNG/JPG logos. Provides 3x3 grid position selection and tile mode, with customizable font size, rotation, opacity, and color. Supports specifying page ranges. All processing is done locally in the browser; no files are uploaded, protecting your privacy.

Steps

1. Click or drag to upload a PDF file
2. Choose watermark type: text or image
3. Text mode: enter watermark text, adjust font size, rotation, opacity, and color
4. Image mode: upload a PNG/JPG image, adjust scale and opacity
5. Choose watermark position (3x3 grid) or enable tile mode to fill the page
6. Choose apply range: all pages or custom pages (e.g., 1,3,5-8)
7. Click the 'Add Watermark' button, then download the watermarked PDF

Notes

• CJK fonts are loaded from CDN; first use requires internet. Loading failure falls back to English fonts with a notification
• Tile mode controls watermark density via row/column spacing; smaller values mean denser watermarks
• Custom page format: comma-separated, supports ranges, e.g., 1,3,5-8 means pages 1, 3, 5, 6, 7, 8
• For image watermarks, transparent PNG is recommended for best results
• All file processing is done locally in the browser; nothing is uploaded to the server, protecting your privacy