Are my original photos uploaded to the cloud?

No. All watermarking operations are performed locally in your web browser using the HTML5 Canvas API. Your images never leave your computer or phone.

Can I position the watermark diagonally across the whole image?

Yes. Select 'Tiled diagonal' from the position dropdown to repeat the watermark across the entire photo, protecting your work from unauthorized cropping.

Can I adjust watermark transparency and color?

Yes. You can customize font size, opacity percentage, and text color with real-time live preview before downloading.

Home / Watermark Image

100% In-Browser · Zero Uploads

Watermark Images Privately

Protect your photos and designs with custom text or tiled diagonal watermarks directly in your browser. Zero cloud uploads and total privacy.

Drop your image here

or click to browse from your computer or phone

Watermark Text

Position

Color

Size

Opacity

Drop a photo above, tune the watermark settings, then download.

Why Watermark Photos Directly In Your Browser?

Sharing creative work, architectural blueprints, real estate listings, and photography online exposes your images to unauthorized reuse, scraping, and content theft. Watermarking establishes ownership and deters copyright infringement.

Most commercial watermarking tools require uploading your high-resolution files to remote cloud servers. OnlyFiles processes every single pixel locally in your browser tab using the HTML5 Canvas API. Your source photographs remain on your machine at all times.

100% On-Device Privacy

Photos never leave your device. Perfect for confidential design drafts, client proofs, and personal photography.

Anti-Theft Tiled Pattern

Repeat your watermark diagonally across the whole canvas so unauthorized users cannot crop it out.

Full Visual Customization

Fine-tune font scale, opacity, text color, and alignment with instantaneous live preview updates.

Lossless Source Quality

Exports at original image dimensions without forced resizing or unwanted visual artifacts.

How to Watermark Images in 3 Simple Steps

1. Upload your photo: Drag and drop your JPG, PNG, or WebP photo into the box above or click to select from your file manager.

2. Configure your watermark: Type your copyright name or brand, adjust text opacity and color, and choose corner, center, or full diagonal tiling.

3. Save instantly: Click "Download Watermarked Image" to immediately save the stamped photograph directly to your device.

Frequently Asked Questions

Does watermarking reduce the sharpness of my original photo?

No. The canvas draws the watermark directly onto the full-resolution pixel buffer of your image, preserving crisp focus and fine details.

Can the watermark be easily cropped out?

If you select the 'Tiled Diagonal' placement mode, the text repeats across the entire surface of the photograph, making it virtually impossible for someone to crop the watermark away without ruining the picture.

Are there any file size or daily usage caps?

None. Because all processing happens locally using your own hardware, you can watermark as many pictures of any resolution as you desire.