Table of Contents
Why Watermark a PDF?
Watermarks serve three main purposes:
- Classification: "CONFIDENTIAL," "INTERNAL," "PUBLIC," "DRAFT v2.3" — instantly communicates handling rules
- Ownership/Traceability: Your logo, "Property of Acme Corp," "Prepared for [Client Name]" — discourages unauthorized sharing, identifies leaks
- Status: "DRAFT," "FOR REVIEW," "APPROVED," "VOID" — prevents accidental use of wrong version
Our Watermark PDF tool handles text and image watermarks with full styling — font, size, color, opacity, rotation, position, page ranges. Client-side. Free. No upload.
How to Add a Watermark Online
Step-by-step with Watermark PDF
- Open onlinepdfeditors.com/watermark-pdf
- Drag your PDF in (or click to browse)
- Choose watermark type: Text or Image
- Configure (see sections below for details)
- Preview updates in real-time — check every page
- Click Apply Watermark
- Download the watermarked PDF
Text Watermarks: Full Styling Control
What you can customize
- Text: Any string — "CONFIDENTIAL," "DRAFT," "Property of [Company]," "Page {page} of {total}"
- Font: Helvetica, Times New Roman, Courier New, Georgia, Verdana, Arial, plus system fonts
- Size: 6–200 pt (slider + manual input)
- Color: Full color picker + opacity (0–100%)
- Rotation: -180° to +180° (diagonal, vertical, custom angle)
- Position: 9 presets (corners, centers, edges) + custom X/Y offset
- Layer: Over content (on top) or Under content (behind)
Pro Tips
- Opacity 30–50% for classification watermarks — visible but doesn't obscure content
- Diagonal (45°) across page center — classic "CONFIDENTIAL" style, hard to crop out
- Under content for subtle branding — logo behind text, visible in margins
- Over content for status stamps — "APPROVED" on top, unmissable
- Dynamic text: Use {page} and {total} placeholders for page numbers (or use Add Page Numbers for Bates numbering)
Image Watermarks: Logos, Signatures, Stamps
Supported formats
PNG (transparency supported), JPG, WebP, SVG (rasterized on import). Max 10 MB.
What you can customize
- Scale: 10–200% of original size
- Opacity: 0–100%
- Rotation: -180° to +180°
- Position: 9 presets + custom offset
- Layer: Over / Under content
Best Practices
- Use PNG with transparency for logos — no white box around the mark
- High-res source (300+ DPI) — watermark scales cleanly
- Opacity 20–40% for background branding — subtle, professional
- Signature images — scan your signature (white bg → transparent PNG), watermark as "signed" stamp
- Stamp graphics — "PAID," "RECEIVED," "APPROVED" rubber-stamp style images
Page Ranges & Positioning
Watermark doesn't have to be every page:
- All pages (default)
- Single page: "5"
- Range: "3-7"
- Multiple ranges: "1, 3-5, 10"
- Odd/Even: "odd" / "even"
Position presets (9-point grid): Top-Left, Top-Center, Top-Right, Middle-Left, Center, Middle-Right, Bottom-Left, Bottom-Center, Bottom-Right. Custom X/Y offset in mm or % for pixel-perfect placement.
Common Use Cases
Photographers — Proof Watermarks
Client proofs: diagonal "PROOF" text (opacity 40%, 45° rotation) + logo in corner. Prevents unauthorized use before purchase. Batch apply to whole gallery PDF.
Designers — Client Review
"FOR REVIEW ONLY — NOT FOR PRODUCTION" diagonal. Logo bottom-right. Send to client — they know it's not final.
Legal/HR — Confidentiality
"CONFIDENTIAL — ATTORNEY-CLIENT PRIVILEGED" diagonal. Company logo. Recipient name in text: "Prepared for [Client Name]." Traceable if leaked.
Internal Docs — Version Control
"DRAFT v1.2 — DO NOT DISTRIBUTE" + date. Prevents someone acting on stale draft.
Invoices/Statements — Status
"PAID" stamp (image watermark, green, opacity 60%, center) on paid invoices. "VOID" on cancelled.
FAQ
How do I add a watermark to a PDF for free?
Open onlinepdfeditors.com/watermark-pdf. Drag file. Add text or image. Style it. Download. Free, no limits, no watermark on output, no account.
Can I add a confidential watermark to a PDF?
Yes. Text: "CONFIDENTIAL." Font: Helvetica Bold. Size: 72 pt. Color: Red. Opacity: 40%. Rotation: 45°. Position: Center. Layer: Over. Done.
How do I watermark a PDF with my logo?
Choose Image watermark. Upload your logo (PNG with transparency preferred). Scale 50–100%. Opacity 30%. Position: Bottom-Right (or your preference). Layer: Under for subtle, Over for prominent.
Can I watermark only some pages?
Yes. Page range field: "1" (first page only), "3-7" (pages 3-7), "1, 5, 10" (specific pages), "odd"/"even".
Can I add page numbers as a watermark?
Yes — use text watermark with {page} / {total} placeholders. Or use our dedicated Add Page Numbers tool for Bates numbering, prefixes, formatting.
Does watermarking a PDF reduce quality?
No. The original page content is unchanged. Watermark is drawn as a new layer. Text stays sharp (vector). Images untouched.
Can I watermark a PDF without uploading it?
Yes — our tool is client-side. Your PDF never leaves your browser. Watermark applied locally via WebAssembly.
How do I remove a watermark from a PDF?
If you added it with our tool and still have the original: use the original. If you only have the watermarked file: you can't easily remove a burned-in watermark (it's part of the page content now). Our Remove PDF Pages deletes whole pages, not layers.
Ready to watermark? Open Watermark PDF — add text or logo, style it, apply to any pages. Free. Private. Instant.