Online Image Watermark Tool

Add text or image watermarks to multiple photos — all in your browser

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Click or drag images here

Supports PNG, JPEG, WebP, BMP, TIFF — add multiple files at once

How It Works

Upload Your Images

Click or drag multiple images into the tool. Supports JPEG, PNG, WebP, BMP, and more.

Customize Your Watermark

Choose text or image watermark. Adjust font, size, color, opacity, position, and rotation. Preview updates in real time.

Download Watermarked Images

Review results in the gallery, download individual images or grab everything as a ZIP file. All processing stays in your browser.

Why Use Our Watermark Tool

100% Private & Secure

Your images never leave your device. All watermark processing runs locally in your browser using Canvas API — no upload to any server.

Batch Processing

Add watermarks to multiple images at once. Apply the same watermark configuration to an entire batch and download everything as a ZIP file.

Text & Image Watermarks

Choose between text watermarks with custom fonts, colors, and rotation, or upload your own logo/image to use as a watermark.

Real-Time Preview

See your watermark changes instantly as you adjust settings. No save-and-reload — the preview updates as you type.

Full Control Over Position

Place your watermark anywhere with the 9-position grid. Set custom opacity and rotation for the perfect look.

No Registration Required

Start watermarking immediately. No signup, no ads, no watermarks added by us. Just upload and process.

Need Batch Processing? Get the Desktop App

The online tool is great for quick, one-off tasks. For heavy daily workloads, our desktop app offers much more power.

Feature	Online Tool	TinyOpt Desktop
Batch Processing	One image at a time	Unlimited batch processing
Watermark	Basic text & image	Advanced placement with drag preview
Format Conversion	JPEG / PNG / WebP	9 formats (incl. AVIF, ICO, PDF)
Batch Rename	Not available	Templates, sequences, date stamps
Compression Engine	Browser-based (WASM)	TinyPNG API (industry standard)

Download Desktop App

Frequently Asked Questions

Are my images uploaded to a server?

No. All watermark processing happens entirely in your browser using the Canvas API. Your images never leave your device, making this one of the most private online watermark tools available.

What image formats are supported?

You can upload JPEG, PNG, WebP, BMP, and TIFF images. The output will be in PNG format to preserve the best quality and transparency of your watermark.

Can I add both text and image watermarks at once?

Currently you can apply one watermark type per batch — either text or image. You can run the tool twice if you need both.

How do I get the best watermark quality?

For image watermarks, use a PNG logo with a transparent background. For text watermarks, use a bold font at a readable size. Adjust opacity to balance visibility with image aesthetics.

Can I batch process images with different watermarks?

Our tool applies the same watermark to all images in a batch. If you need different watermarks, process them in separate batches.

Is this tool really free?

Yes, completely free. There are no usage limits, no hidden costs, and no premium tiers. The tool is open source and runs entirely in your browser.