Add a Watermark to a PDF

PDF
tools

In the digital age, protecting intellectual property and document confidentiality is more important than ever. Are you sending a draft contract to a client and want to be sure it won’t be used as the final version? Are you a photographer or designer who needs to protect a portfolio from theft? Or maybe you need to label sensitive corporate documents as “CONFIDENTIAL”?

The solution is simple: a Watermark. This is semi-transparent text or an image placed over your document. In the past, this required complex and expensive software. Now, thanks to 24glo.com, you can add a professional watermark to any PDF in seconds — free of charge, with no registration, and directly in your browser.

Why “Add Watermark” on 24glo.com is the best choice

Our tool is built around three core principles: Security, Simplicity, and Autonomy. We offer a unique experience that most other services simply can’t match.

1. Absolute privacy: your files are never uploaded to the internet

This is our key advantage. Most online services work like this: you upload your PDF to their server, the server applies the watermark, and then sends the file back to you. This is risky. If you work with trade secrets, personal data, or copyrighted content, uploading files to third-party servers is unacceptable.

24glo.com guarantees 100% security. We use Client-Side Processing technology. This means the watermarking process happens locally on your device. Your browser acts as the editor. Technically, the file never leaves your computer. Neither we, nor hackers, nor service providers can see the contents of your documents.

2. Works offline (no internet required)

Our service is not just a web page — it is a full-featured web application (PWA). You can load the tool at home, then go to a café without Wi-Fi or board a plane, and it will keep working. You are not dependent on connection quality and you don’t waste mobile data. This is the perfect solution for mobile professionals.

3. Professional settings and flexibility

We don’t limit you to a boring “COPY” stamp. Our tool gives you full control over the appearance of your watermark:

• Text or Image: Enter any text or upload your company logo (PNG/JPG).
• Typography: Choose a font (Helvetica, Times, Courier), text size, and color to match your brand style.
• Positioning: Place the watermark exactly where you need it — center, corner, or side — using a convenient positioning grid.
• Rotation and Opacity: Rotate the text (for example, 45 degrees for a classic look) and adjust opacity so the document remains readable.
• Layers: Choose whether the watermark appears above the content (like a stamp) or below it (as a background).

Why use watermarks: common use cases

Watermarks are a universal tool useful in many situations:

Copyright protection:
When sending samples of your work to clients (photos, design mockups, manuscripts), add a semi-transparent logo or the word “Sample”. This helps prevent unauthorized use without payment.

Document status:
In document workflows, it’s important to know the document’s stage. Add large labels like “DRAFT”, “SAMPLE”, or “APPROVED” to avoid version confusion.

Confidentiality:
Mark important files with stamps such as “CONFIDENTIAL”, “TOP SECRET”, or “FOR INTERNAL USE ONLY”. This is a legally meaningful warning that informs recipients of responsibility.

Branding:
Turn any PDF into branded material by adding your company logo and contact details to the header or footer of every page.

How it works: step-by-step guide

The 24glo.com interface is intuitive. You don’t need to be a designer to create a professional-looking document.

Step 1: Upload the file

Click the upload area or drag and drop your PDF file. The document opens instantly because nothing is sent to a server.

Step 2: Configure the watermark

You’ll see a settings panel on the left and a live preview of the first page on the right. All changes appear in real time.

If you choose Text: Enter the desired phrase (for example, “DO NOT COPY”). Choose a color (such as light gray or red), font, and size.

If you choose Image: Upload a file from your computer. We recommend PNG format with a transparent background for best results. Adjust the logo size using the scale slider.

Step 3: Position and style

Select the placement by clicking on the grid (for example, exactly in the center). Set the rotation angle (commonly 45 degrees diagonally). Most importantly, adjust the opacity. Keep it subtle (20–30%) so it doesn’t interfere with readability but remains visible.

Step 4: Save

Click “Download PDF”. The service instantly processes all pages of your document (even hundreds of them) and creates a new file with the watermark applied. The original file remains unchanged.

Advantages of 24glo.com over competitors

• Free with no limits: Other services charge for logos, large files, or batch processing. All features here are available for free.
• No registration: We don’t collect email addresses or send spam. Just open the site and work.
• High speed: Thanks to local processing, there is no server queue. Speed depends only on your device.
• Live preview: See the result before downloading. No need to re-download files just to adjust text size.

Technical information

Our tool is built on modern web standards and works in all current browsers: Google Chrome, Mozilla Firefox, Safari, Microsoft Edge, and Opera. It supports all operating systems: Windows, macOS, Linux, as well as mobile platforms Android and iOS.

There are no limits on page count or file size. You can process a single-page form or a 500-page book. The original document quality (resolution, text layer) remains intact — we simply add a new layer on top.

Conclusion

The “Add Watermark to PDF” service on 24glo.com is your reliable tool for protecting digital documents. We combine convenience, professional features, and absolute security in one place.

Don’t risk your intellectual property. Protect your files right now — without uploading them to the internet or installing unnecessary software.

A full-featured watermarking application

Features include:

1. Watermark types:

Text: Enter any text, choose font (Helvetica, Times, Courier), size, and color.
Image: Upload a logo (PNG/JPG).

2. Flexible settings:

Position: 3x3 grid (top-left, center, bottom-right, etc.).
Opacity: Slider from 0 to 100%.
Rotation: Adjustable angle.
Scale: For images.

3. Layers

Place the watermark above the content or below it (Background / Foreground).

4. Preview

Live update of the first page thumbnail with the watermark applied.

24glo.com — Global Solutions, Local Security, Online Services.