Overview: Add custom text or image watermarks to PDF documents directly in your browser. 100% client-side processing on PDFTeq with zero file uploads or sign-up.
Add Watermark to PDF
Stamp documents with Text or Logo.
Supports Grid Tiling (Repeat) and Transparency.
Select PDF File
Files stay private on your device.
How to Add a Watermark to a PDF Without Uploading
Five simple steps — works on any browser, any device, zero file upload.
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Drop or select your PDF Click the upload box or drag & drop. The file opens locally in browser memory. Nothing is transmitted to any server.
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Choose Text or Logo watermark Type custom text — CONFIDENTIAL, DRAFT, DO NOT COPY, your company name — or switch to Logo mode and upload a transparent PNG logo.
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Set opacity, rotation & size Use the sliders: 30% opacity is ideal, 45° rotation is the industry-standard diagonal stamp. Adjust font/logo size to taste.
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Choose layout — Single Center or Grid Tile Single Center stamps once per page. Grid Tile repeats in a 3×4 mosaic — maximum protection against cropping attacks.
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Click "Apply Watermark" — instant download The Vector Overlay Engine stamps every page. Your file downloads with a timestamped name. Zero data is stored after you close the tab.
.png with a
transparent (not white) background. This blends naturally over document
content instead of covering it with a white box.
(never uploaded)
supported
forever
all pages stamped
Center · Grid Tile
Who Uses This Tool & Why
From solo freelancers to enterprise legal teams — see how different professionals watermark PDFs securely without uploading files.
Legal & Law Firms
Stamp contracts, NDAs, and briefs with CONFIDENTIAL or ATTORNEY-CLIENT PRIVILEGED. Client-side processing means sensitive documents never reach a third-party server.
Corporate & Business
Brand outbound proposals and reports with your company logo. Mark internal strategy docs as FOR INTERNAL USE ONLY before distributing to stakeholders.
Photographers & Designers
Protect portfolio PDFs and design proofs with a logo watermark. Use Grid Tile to prevent clients from using proofs before payment.
Educators & Schools
Mark exam papers and materials as DRAFT or DO NOT DISTRIBUTE. Free and no-account — ideal for educators on a budget.
Real Estate Agents
Add agency logos and SAMPLE stamps to property brochures. Brand every client-facing PDF without expensive desktop software.
Freelancers & Consultants
Watermark client deliverables with your brand. Add INVOICE or APPROVED stamps before sending. Works on Mac, Windows, iPhone, Android.
Healthcare & Medical
Mark patient-facing documents CONFIDENTIAL — PATIENT RECORD. Zero server upload supports HIPAA-compliant local processing.
Mobile Users (iPhone & Android)
Works in mobile browsers — no app download. Open in Chrome or Safari, watermark in seconds, download directly to your device.
PDFteq vs. Other Watermark Tools
How our client-side tool compares on the features that matter most.
| Feature | PDFteq ⚡ | iLovePDF | Smallpdf | Adobe Acrobat | PDF24 |
|---|---|---|---|---|---|
| No File Upload (Client-Side) | ✔ Yes | ✘ Uploads | ✘ Uploads | ✔ Desktop | ✘ Uploads |
| 100% Free Forever | ✔ Yes | ✘ Limits | ✘ Paywall | ✘ $23/mo | ✔ Yes |
| No Sign-Up / No Login | ✔ Yes | ✔ Basic | ✘ Account | ✘ Adobe ID | ✔ Yes |
| Text & Logo Watermark | ✔ Both | ✔ Both | ✔ Both | ✔ Both | Text only |
| Grid Tile / Mosaic Repeat | ✔ Yes | ✘ No | ✘ No | ✔ Pro | ✘ No |
| Works on Mobile Browser | ✔ Yes | ✔ Yes | ✔ Yes | ✘ Desktop | ✔ Yes |
| Server-Side Data Storage | None | Stored | Stored | Local only | Stored |
| Price | Free | Free / $7/mo | $9/mo | $23/mo | Free |
* Based on publicly available feature info as of April 2026.
Frequently Asked Questions
Everything you need to know about watermarking PDFs securely, for free, without uploading your files.
Can I add a watermark to a PDF without uploading the file?
Yes. PDFteq processes your PDF entirely inside your browser using PDF-lib and WebAssembly. The file is loaded into local memory only — no upload, no server contact, nothing stored after you close the tab. This is called client-side processing and it is the safest way to watermark sensitive documents online.
Is this tool really free with no sign-up required?
Completely free, forever. No account, no email, no credit card. There is also no tool watermark added to your output file — a common trick used by many "free" tools. What you configure is exactly what you download.
How do I watermark a PDF on iPhone or Android without an app?
Open pdfteq.com/tools/watermark-pdf in Safari (iOS) or Chrome (Android). The entire tool runs in the mobile browser — no app download needed. Select your PDF from the Files app, configure your watermark, and download the result directly to your device.
What is the Grid Tile (Mosaic) watermark pattern?
Grid Tile repeats your watermark in a 3×4 grid across every page. This prevents cropping attacks — someone cannot remove the stamp by simply cropping a corner. Every section of the page is marked, making the document much harder to misuse.
What opacity setting is best for a PDF watermark?
For standard text documents, 20–35% opacity keeps the watermark clearly visible without obscuring the underlying text. For legal confidentiality marks, up to 50% is appropriate. For subtle branding logos, 10–20% establishes ownership without distracting the reader.
Does watermarking reduce PDF quality or increase file size?
No. PDFteq injects the watermark as a vector path into the PDF content stream — not a rasterised image. File size increases by only a few KB, and the watermark stays crisp at any zoom level. Original text and image quality are fully preserved.
What logo file formats are supported for image watermarks?
Logo watermarks support PNG and JPG files up to 10 MB. PNG with a transparent background gives the best results — it blends naturally with any page background. JPG includes a solid background box that may cover page content.
Can I watermark a scanned PDF or image-based PDF?
Yes. The tool works on both text-based and scanned (image-based) PDFs. For scanned documents, the watermark is placed as a vector layer on top of the scanned page image. The original scan is not modified — only a new transparent vector layer is added above it.
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