Stamp a text watermark on every page of your PDF. Customize the text, opacity, and color.
Drop a PDF file here
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Watermark will be applied to all pages
Maximum recommended file size: 100MB
Protect Your Documents with Custom Watermarks
Adding a watermark is one of the best ways to indicate document status (such as Draft, Confidential, or Approved) or establish ownership of your work. Our secure, browser-based tool lets you quickly apply custom text watermarks across every page of your PDF. With intuitive controls for opacity, font size, and color, you can ensure your watermark is visible without obscuring the underlying content.
What This Tool Does
This client-side tool allows you to apply semi-transparent text/logo stamps to PDF directly in your browser. Without requiring any installation or software downloads, you can securely select your documents, apply your desired parameters, and obtain a high-fidelity watermarked PDF in seconds.
Who Should Use It
Ideal for students compiling homework, legal professionals handling sensitive client files, healthcare administrators matching HIPAA standards, and businesses protecting intellectual property. If you need absolute data confidentiality and cannot risk uploading files to a public cloud, this is your solution.
Supported File Types
Input format: Standard PDF files (.pdf) , as well as source documents like image files or Office spreadsheets.
Output format: Clean watermarked PDF format.
Constraint: Fully preserves original vector shapes, metadata structures, and hyperlinks.
Privacy Model
100% Local-First. Your files are never uploaded to our servers. We do not operate external caches, databases, or third-party tracking mechanisms. All data resides in temporary device memory.
Processing Method
Operations are computed inside the browser’s secure sandbox environment. WebAssembly (Wasm) and Javascript modules read and re-compile document byte streams at near-native execution speed.
Browser Compatibility
Fully compatible with Google Chrome, Apple Safari, Mozilla Firefox, Microsoft Edge, and mobile browsers on Windows, macOS, Linux, ChromeOS, iOS, and Android.
Security Standards
Files remain isolated inside the browser tab’s execution threads. We employ symmetric AES-256 standards when handling passwords and encrypting outputs.
Performance limits
Sub-second response times for typical documents. Since memory allocation happens locally, performance scales directly with your device's processor and free RAM.
Common Use Cases
Consolidating research papers, compressing visa documents under consulates’ limits, hiding confidential digits via black box shapes, or e-signing client receipts offline.
How to Add a Watermark
Upload Document: Select or drag and drop the PDF you want to watermark.
Customize Watermark: Enter your custom text (like 'CONFIDENTIAL' or 'DRAFT'), and tweak the opacity, size, and color.
Apply and Save: Click 'Add Watermark' to process the file, then download the watermarked PDF.
FAQ
Upload your PDF file, enter the text you want to use as a watermark, adjust the opacity, font size, and color, then click 'Add Watermark' to apply it to all pages.
Yes, you can easily adjust the opacity slider to make your watermark more transparent or more opaque depending on your needs.
Absolutely. All processing happens entirely within your browser. Your files are never uploaded to any external servers, ensuring complete privacy.
You can control the watermark's transparency (opacity) using our custom slider. This ensures the watermark is clearly visible as an overlay without blocking readability.
Yes. By default, the text watermark is stamped across all pages of your PDF document in a consistent position.
All document processing takes place directly in your browser's local sandbox memory using WebAssembly and WebGL. We employ a local-first privacy model: your PDF files are never uploaded to any remote server or third-party cloud. Your sensitive information never leaves your device.
Yes, absolutely! Once you load the page in your web browser, all transformation algorithms run entirely on your local machine. You can disconnect from the internet (offline mode) and continue performing all PDF tasks safely.
Unlike server-based converters that restrict free accounts to 10MB or 50 pages, our local tools have no hard-coded limitations. The processing speed and maximum file capability depend entirely on your device's processor speed and browser RAM capacity.
No. Our tools are completely free. You don't need to register an account, sign up with an email, or pay for a premium subscription. All features are open and immediately accessible.
Yes, because your documents are never transmitted over the internet or stored on third-party servers, your document workflows are automatically compliant with strict global security and privacy standards, including HIPAA, GDPR, and CCPA.
Yes, our responsive interface is optimized for all modern web browsers on mobile (iOS, Android, iPadOS) and desktop platforms (Windows, macOS, Linux, ChromeOS).
Adobe Acrobat requires a paid desktop subscription and cloud storage sync. Our tool offers a completely free, browser-native alternative. It allows you to transform and edit documents instantly without any software installation, background telemetry, or monthly fees.
Troubleshooting
If processing fails or the page hangs: close other resource-heavy browser tabs to clear RAM, double-check that your document is not secured with an owner lock, or process the file through our Repair PDF utility first to fix underlying index table errors.
Alternatives
Popular alternatives include Adobe Acrobat Pro, Smallpdf, and Sejda. iluvepdf distinguishes itself by running 100% locally in your browser, maintaining full security without subscriptions or upload waiting queues.
Related Tools & Next Steps
Once you have processed your file, we recommend exploring these related tools: