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Watermark Image

Type your name or site, pick a position, stamp it. Your images never leave your device.

Drop your images here

  • Files never leave your device
  • Unlimited · No signup

Watermark an image in 3 steps

  1. Choose your JPG, PNG or WebP images.
  2. Type your text, then pick the strength (Light, Medium, Strong) and the position.
  3. Press "Add Watermark" and download (several images come as one ZIP).

Why ConvertKoala?

  • Readable on any photo

    White text with a soft shadow stands out on bright skies and dark backgrounds alike.

  • Simple choices

    Three strengths and three positions: diagonal across the photo, centered, or bottom-right corner.

  • Whole batches at once

    Stamp the same text on dozens of photos and download them as one ZIP. No caps, no account.

  • Your originals stay private

    Watermarking runs in your browser. Unmarked photos are never uploaded anywhere.

Frequently asked questions

Which position should I choose?

Diagonal covers the whole photo and is the hardest to crop out, so it suits product photos and previews you send to clients. Center is a middle ground. Bottom-right is the most discreet and works for photos you post publicly with a simple credit.

Can a watermark be removed?

Honestly, yes, with enough effort: a corner mark can be cropped off and editing tools can paint over text. A watermark deters casual copying and shows who owns the photo; it is not a lock. A stronger, diagonal mark is much more work to remove.

Can I add a logo instead of text?

Not yet. This tool adds a text watermark such as your name, shop name, website or "Sample". It is not a full text editor either: one line of text, in white with a soft shadow.

Can I watermark many photos at once?

Yes. Choose as many images as you like; the same text, strength and position are applied to all of them and you download one ZIP file.

Does it work on my phone?

Yes. Open this page in your phone’s browser, tap "Choose files" and pick your photos. JPG, PNG and WebP are supported; iPhone’s HEIC format is not supported yet.

Are my images uploaded?

No. Everything happens inside your browser on your own device. Your images never reach our servers, and nothing is kept once you close the page.

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