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Convertto

Image Watermark Tool — Text or Logo, in Bulk

Stamp text or a logo across your images, one at a time or a whole batch.

To watermark images, add your photos, type the text or upload a logo, then choose where it sits and how transparent it should be. The size is set as a percentage of each image, so a batch of mixed dimensions gets a proportional mark rather than one that is huge on some and invisible on others. Everything is composited in your browser.

Runs in your browser
Batch
One watermark applied across any number of images at once
Privacy
Photos are composited in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Can a watermark be removed from my image?

Yes, by anyone determined enough — a corner watermark crops off in seconds and inpainting tools erase the rest. A tiled semi-transparent watermark across the whole frame is far harder to remove cleanly, which is why stock libraries use exactly that. Treat a watermark as a deterrent and an attribution, not as protection.

Why is my watermark invisible on some photos?

White text at 45% opacity disappears over a bright sky. Switch on the drop shadow, which keeps light text readable over light backgrounds, or pick a colour with more contrast against the images you are actually marking.

Does watermarking reduce image quality?

Only through re-encoding. Keeping the format as PNG or WebP is lossless; a JPG is decoded and re-encoded, which loses a little. Set quality to 95 or higher and the difference is not visible, or export as WebP to avoid the question.

How to use the add a watermark to images

  1. 1Select your images — the file stays on your device and is never uploaded.
  2. 2Enter or paste your watermark text.
  3. 3Select your logo image — the file stays on your device and is never uploaded.
  4. 4Choose the position.
  5. 5Set the size.
  6. 6Set the opacity.
  7. 7Set the rotation.
  8. 8Pick the text colour.
  9. 9Set the edge margin.
  10. 10Turn "Drop shadow behind the text" on or off as needed.
  11. 11Choose the output format.
  12. 12Set the quality.
  13. 13Press Run, then download the result when it is ready.

Embed this tool

Put the working add a watermark to images on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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