Watermark PDF Online Free — Add Custom Text, Logo & Stamp
Add custom text, logo, or confidential stamps to PDF pages online for free. Adjust opacity, rotation, and tiling to protect marksheet copies, court filings, and proposals. 100% private.
To add a watermark to a PDF online for free, upload your document to iEditPDF Watermark Studio. Enter your custom text (e.g. 'FOR KYC ONLY', 'CONFIDENTIAL', or 'SUBMITTED TO [COMPANY]') or upload your organization's logo. Customize opacity and diagonal angle to stamp all pages simultaneously with zero server uploads.
6 Watermark Studio Superpowers (Batch Text & Logo Stamping)
Protect confidential PDF documents with custom watermarks, dynamic dates, and transparency control.
Paid tools charge subscriptions for multi-page batch watermarking. iEditPDF stamps unlimited pages in seconds for free.
1. Text & Transparent PNG Logo Support
Stamp bold security text like CONFIDENTIAL, DRAFT, SAMPLE, or upload your full-color company logo.
2. Granular Opacity & Alpha Slider
Fine-tune watermark transparency between 10% and 90% so underlying document text remains crisp and legible.
3. 45° Diagonal or Horizontal Angles
Position watermarks corner-to-corner across pages or centered horizontally for subtle header/footer branding.
4. 1-Click All-Page Batch Stamp
Apply your configured watermark across hundreds of pages in under 200 milliseconds using WebAssembly.
5. Layer Vector Bonding
Composites watermarks directly into the document structure to prevent casual deletion or scraping.
6. 100% In-Browser Privacy Guarantee
All watermarking logic executes entirely on your computer or phone. Sensitive drafts never leave your device.
How to Add Confidential Stamp or Logo Watermark to PDF
Simple 4-step walkthrough for fast, secure processing
Upload PDF
Drop your PDF file into the Watermark PDF studio.
Configure Watermark
Type custom text or upload a transparent PNG logo.
Tune Opacity & Angle
Select transparency, font styling, color, and 45-degree diagonal rotation.
Apply & Export
Preview live on page 1, apply across all pages, and download your watermarked document.
How Watermark PDF Works: Keep Your Files Safe & Private
See step-by-step how your files are processed. Everything happens right inside your browser — your files are never uploaded to the internet or shared with anyone.
1. Open on Your Device
When you pick a file, your browser opens it directly on your computer or phone. Your document stays on your device and is never uploaded anywhere.
2. Process in Your Browser
Your device does all the work right inside your browser. Because there are no server queues or waiting lines, your files are processed instantly.
3. Save in Private Vault
When you save your work, your file is stored securely inside your browser's private vault on your device. You can view or reopen it anytime, even without internet.
4. Download, Reuse, or Delete
Download your finished file, send it directly to another tool without re-uploading, or click 'Clear Vault' to permanently erase your files anytime with one click.
How You Can Prove Your Files Never Leave Your Device
Open this tool, turn off your Wi-Fi or turn on Airplane Mode, and drop your file. It will still process and let you download the result! This demonstrates that processing happens locally on your device without sending your files to any external server.
We never ask for your email, credit card, or account. Your files are never stored on any remote cloud server. When you finish and close your browser or click "Clear Vault", your documents are permanently erased from your device memory.
Watermark PDF Technical Details & Browser Support
Key features, device compatibility, and supported file types
Runs Directly on Your Device
Processed by your browser with zero waiting or upload lag.
100% Private (0 Files Uploaded)
Safe for bank statements, IDs, tax forms, and confidential files.
100% Watermark-Free
Clean original documents ready for official submissions.
Drag & drop or paste directly from clipboard (Ctrl+V).
100% Free With No Limits
No account needed, no daily limits, and no paywalls.
Works on All Phones & Computers
iPhone, Android, Windows PC, Mac, iPad, and Chromebook.
Looking for a Free Alternative to Popular Cloud Tools?
Unlike cloud-based services that upload your files to remote servers or enforce hourly limits, iEditPDF runs 100% in your browser.
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Frequently Asked Questions About Watermark PDF
Everything you need to know about Watermark PDF on ieditpdf.in