UtilityKit

500+ fast, free tools. Most run in your browser only; Image & PDF tools upload files to the backend when you run them.

PDF Watermark

Stamp semi-transparent text across every page server-side

About PDF Watermark

PDF Watermark stamps semi-transparent text across every page of your document, letting reviewers immediately recognise drafts, confidential bundles, or internal-only variants without permanently obscuring the content. Upload your PDF, type your watermark text (DRAFT, CONFIDENTIAL, FOR REVIEW, or any custom label), set the opacity from subtle to bold, and choose corner placement or diagonal positioning. The server applies the stamp to every page using pdf-lib and sends back a ready-to-share PDF in seconds. This is the go-to tool for legal teams circulating preliminary agreements, HR sharing policy drafts before sign-off, and educators distributing marked-up student materials. Files travel over HTTPS and are permanently deleted from the server the moment your watermarked PDF is downloaded.

Why use PDF Watermark

Custom Text, Position, and Opacity

Type any label, set transparency from barely-there to clearly visible, and place the stamp diagonally or in any corner.

Diagonal or Corner Placement

Classic diagonal-across-page stamping for DRAFT labels, or discreet corner placement for subtle branding or reference marks.

Every Page Stamped Uniformly

The watermark is applied consistently to every page in one pass — no need to open each page individually in an editor.

No Permanent Content Damage

Semi-transparent stamping allows the underlying text and images to remain readable — recipients can work with the content while clearly seeing the status label.

Secure HTTPS Processing

Confidential or preliminary documents travel over an encrypted connection and are deleted immediately after the watermarked PDF is delivered.

Free with No Signup

Stamp as many documents as you need with no account required and no branding added beyond your chosen watermark text.

How to use PDF Watermark

Upload the PDF you want to watermark — files up to 50 MB are accepted.
Type your watermark text in the text field — for example DRAFT, CONFIDENTIAL, or your company name.
Set the opacity slider to control transparency: lower values (e.g., 20%) are subtle, higher values (e.g., 60%) are prominent.
Choose the placement — diagonal (centred across the page at 45°) or a corner position (top-left, top-right, bottom-left, bottom-right).
Click Apply Watermark and wait a few seconds for the server to stamp every page.
Download the watermarked PDF — the server deletes both copies immediately after delivery.

When to use PDF Watermark

When circulating a preliminary contract or agreement for review before final execution.
When sharing internal policy drafts with staff before the official sign-off version is released.
When distributing board meeting materials that are subject to change and should not be shared externally.
When educators distribute student-facing materials marked DRAFT or SAMPLE to prevent them being submitted as final.
When sales teams need to label price lists or proposals as CONFIDENTIAL before sending to prospects.
When adding a company name or PROOF watermark to design proofs before client approval.

Examples

Legal draft watermarking

Input: contract.pdf (8 pages), watermark text: 'DRAFT', opacity: 30%, placement: diagonal

Output: contract-draft.pdf — each page shows 'DRAFT' at 45° in light grey across the centre, content fully readable

Confidential price list

Input: pricing.pdf (3 pages), watermark text: 'CONFIDENTIAL', opacity: 40%, placement: bottom-right corner

Output: pricing-confidential.pdf — discreet bottom-right stamp on every page

Design proof with branding

Input: proof.pdf (12 pages), watermark text: 'UtilityKit PROOF', opacity: 20%, placement: diagonal

Output: proof-watermarked.pdf — light diagonal brand mark across all 12 pages before client approval

Tips

For subtle CONFIDENTIAL labelling, set opacity to 20–25% so the stamp is visible without overwhelming the page content.
Diagonal placement reads more authoritatively as a DRAFT or CONFIDENTIAL mark; corner placement is less obtrusive for reference codes.
Always keep the original unwatermarked PDF — there is no undo once the stamp is applied.
If the document is encrypted, run it through PDF Unlock first before watermarking.
For maximum consistency, use all-caps labels (DRAFT, CONFIDENTIAL, FOR REVIEW) as they render more legibly at small font sizes across varied page sizes.

Frequently Asked Questions

Can I remove the watermark after applying it?▾

Not with this tool — the stamp is baked into the page content by pdf-lib. To remove it, you would need the original unwatermarked file. Always keep the original before watermarking.

Will the watermark cover important content?▾

At typical opacity settings (20–40%), the watermark text is translucent and the underlying content remains clearly readable. Set opacity higher if you need a more prominent stamp.

Can I use images as a watermark instead of text?▾

The current tool supports text watermarks only. For logo or image watermarks, you would need a PDF editor with image overlay capabilities.

Does watermarking work on scanned PDFs?▾

Yes. The stamp is drawn as a vector overlay on top of each page — scanned (raster) pages get the watermark just as text-layer PDFs do.

Can I watermark an encrypted PDF?▾

No — use the PDF Unlock tool to remove the password first, then apply the watermark.

Are my files stored after watermarking?▾

No. The source PDF and the watermarked output are both deleted from UtilityKit's server immediately after your download is sent.

What fonts are available for the watermark text?▾

The tool uses a standard built-in font for cross-platform consistency. Custom font selection is not currently supported.

Can I watermark multiple PDFs at once?▾

The tool processes one PDF at a time. For batch watermarking, merge your PDFs first, watermark the combined file, then split the result if needed.

Explore the category

Glossary

Opacity: The degree of transparency of the watermark text, expressed as a percentage; 0% is fully invisible and 100% is fully opaque.
Diagonal Placement: Positioning the watermark at a 45° angle across the centre of the page — the classic style for DRAFT or CONFIDENTIAL stamps.
Vector Overlay: Drawing the watermark as resolution-independent shapes and text on top of the page content, so it scales cleanly regardless of PDF page size.
pdf-lib: An open-source JavaScript library for creating and modifying PDF documents server-side, used by this tool to apply watermarks.
Flattening: The process of merging overlaid content (annotations, stamps, form fields) into the static page layer — what happens when the watermark is baked in.
Page Layer: A PDF structural concept where content can exist at different z-order levels on a page; the watermark overlay is placed above the base content layer.