Is my PDF uploaded to a server?

No. Dropped PDFs are read as ArrayBuffers and handed straight to pdf-lib in the browser. Stamping, encoding, and saving are local — no network traffic.

Can I write Japanese in the text watermark?

Text mode only supports Helvetica (Latin / symbols). For non-Latin scripts, render the text as a transparent PNG in your editor of choice and use image mode instead.

How do I write the page range?

Leave it empty (or write `all`) to apply to every page. Otherwise, use comma-separated page numbers or ranges like `1-3,5,7`. Out-of-bounds entries are silently skipped, not treated as errors.

How do position and margin interact?

Pick one of the 9 anchor points (corners, edge midpoints, or center). The margin (as % of page width) controls how far from each chosen edge the watermark sits. For center placement, the margin value is ignored.

What rotation values are accepted?

Any integer between -180° and 180°. Common picks: 0 (horizontal), -45, 45, 90, -90. Rotation pivots around the watermark's own center.

Does it support encrypted PDFs?

Not in this version. Run them through pdf-unlock first, then pipe the result into this tool.

Back to PDF

PDF watermark — text or image overlay

Stamp every page of a PDF with text (DRAFT / CONFIDENTIAL / © ...) or an image logo. Pick from a 9-grid placement, adjust opacity, size, rotation, and restrict to specific page ranges. Runs entirely on pdf-lib in the browser — your files never leave the device. Batch processing and ZIP download supported.

pdfwatermark

How to use

Pick the watermark type (text or image), then drop your PDFs. In text mode, set the string, color, and font size; in image mode, choose a PNG / JPEG / WebP logo. Tune placement (9-grid), opacity, rotation, margin, and the page range (`all` or `1-3,5,7`), then click Add watermark to stamp every selected page. Output PDFs preserve the original page sizes and orientations. Batch processing and a single ZIP download are supported. Everything runs on pdf-lib in your browser — files never leave your device.

FAQ

Is my PDF uploaded to a server?: No. Dropped PDFs are read as ArrayBuffers and handed straight to pdf-lib in the browser. Stamping, encoding, and saving are local — no network traffic.
Can I write Japanese in the text watermark?: Text mode only supports Helvetica (Latin / symbols). For non-Latin scripts, render the text as a transparent PNG in your editor of choice and use image mode instead.
How do I write the page range?: Leave it empty (or write `all`) to apply to every page. Otherwise, use comma-separated page numbers or ranges like `1-3,5,7`. Out-of-bounds entries are silently skipped, not treated as errors.
How do position and margin interact?: Pick one of the 9 anchor points (corners, edge midpoints, or center). The margin (as % of page width) controls how far from each chosen edge the watermark sits. For center placement, the margin value is ignored.
What rotation values are accepted?: Any integer between -180° and 180°. Common picks: 0 (horizontal), -45, 45, 90, -90. Rotation pivots around the watermark's own center.
Does it support encrypted PDFs?: Not in this version. Run them through pdf-unlock first, then pipe the result into this tool.

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