Stamp a diagonal word across every page of a document
Lay CONFIDENTIAL, DRAFT or your own wording across a PDF's pages, diagonal or flat, with adjustable size, colour and opacity.
Watermark PDF workspace
Drop files here or browse files
Drop a file here or browse to start.
- Eight ready phrases or your own
- Diagonal or horizontal, six colours
- Opacity and size both adjustable
- All pages or just this one
EditPDFKit draws one centred uppercase text watermark on each page at the angle, colour, size and opacity you choose, sitting in front of the existing page content.
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. EditPDFKit 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.
Built and maintained by Akash Kore · About
How to Add Text or Image Watermarks to PDF Pages
Simple 4-step walkthrough for fast, secure processing
Open the PDF
Drop the document in. The watermark dialog opens on its own once the pages have loaded.
Choose the wording
Pick one of the ready phrases such as CONFIDENTIAL or DRAFT, or type something of your own.
Set the look
Choose diagonal or horizontal, pick a colour, and move the opacity and font size sliders until it reads the way you want.
Apply and export
Apply it to every page or to the current one only, then open the download dialog and save the marked file.
EditPDFKit vs. Cloud PDF Stamping Portals
Why thousands of privacy-conscious users choose EditPDFKit over cloud converters
| Feature | EditPDFKit (editpdfkit.com) | Cloud PDF Portals (iLovePDF, Smallpdf) |
|---|---|---|
| Where Files Are Processed | Directly on Your Device (Zero Uploads) | Uploaded to Remote Company Servers |
| Privacy & Safety | Zero Uploads • Files Never Leave Your Device | Files Uploaded and Retained on Remote Company Servers |
| Custom Text & Logo Stamping | Overlay high-res transparent PNG company logos or custom security text (DRAFT, CONFIDENTIAL) | Rigid plain text only; locks image/logo watermark stamps behind paid subscriptions |
| Diagonal 45° Angle & Layering | Position diagonally across all pages with custom transparency slider (above or behind text) | Single horizontal orientation only; easily obscured by existing document text |
| Permanent Vector Stream Flattening | Bakes watermarks into PDF content streams so they cannot be stripped by basic PDF viewers | Superficial metadata annotations that can be trivially selected and deleted |
| Confidentiality & Zero Uploads | Proprietary investment decks, legal contracts, and audits remain 100% in local browser memory | Uploads sensitive pre-release documents to external cloud queues |
| Built-in Privacy Vault | Saved Privately on Your Device (View or delete anytime) | Saved on Cloud Servers (Cannot verify if or when deleted) |
| Daily Usage Limits | 100% Unlimited & Free Forever | Free tiers commonly cap daily files; check their pricing pages |
| File Size Limits | No Limits (Process files of any size) | Free tiers commonly cap upload size; check their pricing pages |
| Works Without Internet | Yes • 100% Offline (Works without Wi-Fi) | No • Fails without constant internet connection |
| Account & Sign In | No Signup • No Login • Zero Email Required | Commonly requires an account or email to use fully |
| Watermarks on Your Files | 100% Clean • No Watermarks Ever | Free tiers commonly add a watermark or charge to remove it; check their pricing pages |
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 edit, convert, or compress and let you download the result! This proves the tool works completely offline without sending anything to any server.
Press F12 on your keyboard (or right-click anywhere and choose "Inspect"), click on the Network tab, and process your file. You will see 0 bytes of your file sent over the web — absolute proof of 100% privacy.
PDF Page Geometry, Coordinate Systems & Font Embedding Specs
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, no paywalls
Works on All Phones & Computers
iPhone, Android, Windows PC, Mac, iPad, and Chromebook
Need to Hit an Exact File Size Upload Limit?
Online job boards, immigration visa portals, universities, and court e-filing systems enforce strict KB ceilings. Select a calibrated target size solver below to compress without losing readability.
Legal & Court Portals
Strict compliance while keeping vector text razor sharp.
Exam, Job & Visa Portals
The ceiling UPSC, SSC, bank exam and visa forms set most often.
Job Portals & HR Forms
Ideal for resume attachments, certificates, and multi-page scans.
Email & Universities
Reduces large PDF decks under standard mail attachment limits.
Any Custom Limit
Set an exact target size with interactive compression preview.
Looking for a Free Alternative to Popular Cloud Tools?
Unlike cloud-based services that upload your files to remote servers or enforce hourly limits, EditPDFKit runs 100% in your browser.
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Tap a star to rate your experience. No account or email needed.
Frequently Asked Questions About Adding Watermarks to PDF
Everything you need to know about Watermark PDF on editpdfkit.com
How to get the most out of Watermark PDF
Written walkthroughs for the jobs people actually bring to this tool.
- PDF Watermarking & Copyright3 min read
How to Add Confidential and Draft Watermarks to PDF Pages Online
Sending pitch decks to investors, draft contracts to clients, or mock exam papers to students requires copyright protection to prevent unauthorized redistribution. EditPDFKit's Watermark PDF tool lets you stamp diagonal semi-transparent text watermarks (like 'CONFIDENTIAL', 'DRAFT', or 'DO NOT COPY') or company logos across your PDF pages with exact opacity and angle controls.
Read the guide - Document & Photo Security4 min read
How to Add Watermarks to PDF & Images Online Free (Batch Text & Logo Stamping)
Prevent unauthorized distribution and copyright theft by stamping confidential text watermarks or company logos across your PDF documents and photo files. EditPDFKit provides full control over font size, color, opacity, diagonal rotation, and tiled repeat patterns—100% free with zero cloud uploads.
Read the guide