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Image · Watermark

Add a watermark. Text or logo, nine anchor positions.

Stamp text or logo watermarks onto any photo — positioned exactly where you want, at exactly the opacity you choose. Right here in the browser. Nothing leaves your device.

Watermark now Watch the 20-sec demo →
JPEG · PNG · WebP · HEIC Text & logo Batch mode
watermark · colosseo.jpg
Input
JPEG PNG WebP TIFF HEIC BMP
Output
JPEG PNG WebP

Runs in your browser. Nothing leaves your machine.

Every watermark is composited locally using the Canvas API. The pixel data never leaves your device — no server roundtrip, no hidden upload.

4.8M+
images watermarked
100%
client-side
0
files uploaded

Workflow

Three steps. Then done.

From raw photo to stamped download in under a minute — no registration, no server roundtrip, no waiting.

01 / DROP

Drop your photos.

Drag a folder or pick individual files. JPEG, PNG, WebP, HEIC, TIFF — anything the browser can decode lands in the queue.

02 / STYLE

Design your watermark.

Type your text or upload a transparent PNG logo. Dial in opacity, pick your anchor point from the 9-position grid, and scale to taste.

03 / DOWNLOAD

Download. Or ZIP them all.

Single file or batch — download individually or grab a ZIP. Output quality matches input; no surprise re-compression happens behind the scenes.

What people say

Photographers, designers, small studios.

Watermark types

Text or logo — your call.

Type a copyright line or drop a transparent PNG of your logo. Both modes use the same compositing pipeline: pixel-perfect alpha blending, no re-encoding artifacts.

  • Text
    Scalable at any resolution Rendered at output pixel density — crisp on 6000×4000 prints and 800×600 web previews alike.
  • Logo
    Transparent PNG, pixel-perfect Upload any RGBA PNG. The alpha channel is respected exactly — semi-transparent edges stay semi-transparent.

What you can stamp

Text, logo, signature — anything goes.

There's no limit to what you can use as a watermark. Type a copyright line, drop your studio logo, paste a handwritten signature scan, or overlay any transparent PNG you like.

  • Text
    Copyright lines, names, URLs Type anything — © 2025 Your Name, your website, a tagline. Rendered at full output resolution so it stays crisp on any print size.
  • Logo
    Your brand mark as a transparent PNG Upload any RGBA PNG — studio logo, seal, icon, handwritten signature. Alpha channel is respected exactly, soft edges included.
  • Custom
    Anything that fits in a PNG Badge, QR code, date stamp, "PROOF" overlay — if you can export it as a transparent PNG, you can stamp it onto any photo.
The honest comparison

kindatool vs. the ones that upload.

Not a knock — they're just not designed for your privacy the way this is.

Feature comparison
★ Best pick kindatool
Adobe Photoshop
iWatermark
Visual Watermark
Runs entirely in your browser
Yes
Desktop app
Desktop app
Desktop app
No account, no email
Never
Required
App Store
Required
Text & transparent PNG logo
Both
Both
Both
Text only (free)
9-point position grid
Yes
Manual placement
Yes
Yes
Output WebP
Yes
Yes
Price
Free, forever
$10.99–$69.99/mo
$20 one-time
$19.95/yr or $39.95 lifetime
Things people ask

Common questions about watermarking.

Does kindatool upload my photos to add the watermark?
No. The watermark is composited using the browser's Canvas API — your pixels never travel beyond your own RAM. Open DevTools → Network while you watermark an image and you'll see exactly zero outbound requests. There is no server receiving your photos.
Can I use a logo image as the watermark instead of text?
Yes. Upload any transparent PNG — your logo, signature, or icon — and it will be composited pixel-for-pixel onto the photo, alpha channel intact. Semi-transparent edges stay soft. Vector-style PNGs at 2× or 3× render crisp on every output resolution.
What's the best opacity for a visible but non-intrusive watermark?
It depends on the photo. As a starting point: 30–45% for editorial proofs where you want it subtle; 55–70% for proof sheets meant to prevent unauthorized use; above 70% for clearly promotional "sample" overlays. Light-colored photos need slightly higher opacity — the slider lets you preview before you commit.
Can I watermark once and a user just remove it in Photoshop?
A determined person with Photoshop can attempt content-aware fill on any visible watermark — that's true of every tool in this space. The goal isn't cryptographic undeniability; it's raising the cost of removal above the value of unauthorized use. Opacity around 50% centered on the subject makes clean removal genuinely difficult.
Does adding a watermark reduce my image quality?
Only where the watermark overlaps — and only by the alpha blend amount you chose. The surrounding image is untouched. If you export as PNG the output is lossless. If you export as JPEG, the encoder runs once on the composited image at quality 92 — comparable to Lightroom's "high quality" export setting.
Can I watermark multiple photos at once?
Yes. Drop a folder or select multiple files in the picker — the tool queues them and processes in parallel using a Worker pool. Results download as a ZIP. A batch of 50 JPEG files at 24 MP takes roughly 20–40 seconds on a modern laptop, depending on your CPU.
Pair it with
Compress
SSIM-aware encoder. Cut size without hurting quality.
Open →
Resize
Lanczos & Mitchell filters, locally.
Open →
Convert
HEIC, AVIF, WebP, PNG, JPEG — any to any.
Open →
Rotate
90°, 180°, free-angle. Lossless for JPEG.
Open →
Blur
Gaussian, motion, face detection.
Open →

Your work. Your stamp. Done.

Drop your photos below — or paste a URL and we'll fetch the image client-side. The same pipeline runs either way. Nothing routes through us.

No upload No account No limits Free forever