Are my images uploaded to a server?

No — never. All processing uses the Canvas API built into your browser. Images never leave your device. After the initial page load the tool works completely offline; you can disconnect Wi-Fi and it still runs.

Why does the watermark look the same size on every image even though they're different dimensions?

Size and position are set as a percentage of each image's shorter dimension, not as fixed pixels. So a 5% font size on a 500 px thumbnail and a 5% font size on a 4000 px photo both produce a watermark that takes up the same visual proportion of the image — the key feature for batch consistency.

Can I use a transparent PNG logo as the watermark?

Yes. Switch to Logo / Image mode, upload your PNG (transparency is preserved), and set scale and opacity. The logo is composited cleanly on top of each image without a white box.

What is tiled / repeat mode?

Tiled mode stamps the watermark repeatedly across the whole image in a diagonal pattern — the classic look of a 'DRAFT' or copyright overlay. It's useful when you want it to be impossible to crop out the watermark.

How many images can I watermark at once?

The free plan processes up to 10 images per batch. Upgrade to Pro for unlimited batches and saved watermark presets.

Does it handle iPhone HEIC photos?

Yes. HEIC files are decoded in-browser using the same engine as the HEIC Converter tool — no app or plugin needed. The decoded image is watermarked and exported as JPG by default.

What output formats are supported?

Keep the original format (JPG stays JPG, PNG stays PNG), or convert the whole batch to JPG, PNG, or WebP. For lossy formats you can set the quality from 50% to 100%.

Photos

Batch Watermark

Add a text or logo watermark to many images at once — entirely in your browser. Drag-to-position or use the 9-point grid. Relative sizing keeps the watermark consistent across every image, whatever the resolution. Download all as a ZIP.

Runs entirely on your device — nothing is uploaded.

Drop your images here

or click to browse · JPG, PNG, WebP, HEIC · Batch watermark · Nothing is uploaded

⚠️ The free plan processes up to 10 images per batch. Large batches at very high resolution use browser memory — if the page slows down, process in smaller groups.

The Batch Watermark tool adds a text or image watermark to many photos at once — with drag-to-position, a tiled pattern option and relative sizing so the watermark stays consistent across every image — entirely in your browser.

Key facts

Text or image (logo) watermark
Drag-to-position or 9-point grid placement; tiled pattern option
Relative sizing keeps watermark proportional across all image sizes
Batch-process many images, download all as ZIP
100% in-browser — your images never leave your device
Free, no account or sign-up required

Drop your images

Drag one or many images — JPG, PNG, WebP, or HEIC — onto the drop zone, or click to browse. Everything stays on your device. Nothing is uploaded to a server.

Configure your watermark

Choose a text watermark (custom text, font, size, colour, opacity, rotation, shadow/outline) or a logo watermark (transparent PNG with scale and opacity). Set the position using the 9-point grid, drag directly on the preview to place it exactly, or enable tiled mode for a diagonal copyright pattern across the whole image. All sizes are relative (% of each image), so the watermark looks consistent across images of different dimensions.

Apply and download

Click Apply to watermark all your images in one go — you'll see a live progress bar. Download each file individually or grab the whole batch as a single ZIP. The original format is preserved by default, or you can convert to JPG, PNG, or WebP.