What logo format works best?

PNG with a transparent background - the watermark blends into the photo cleanly without a white box. JPG works but the white background shows. SVG isn't supported (we render to raster Canvas).

How big should my logo file be?

256-512 px on the long side is plenty - logos scale down to ~25% of the photo's shorter dimension by default. Bigger logos just take longer to decode without improving final quality.

Can I save the logo for next time?

Image watermarks aren't persisted between sessions (the logo file is held in browser memory and can't be serialised to localStorage). Re-upload the logo at the start of each session - takes 2 seconds.

Will my logo's transparency be preserved?

Yes - PNG transparency maps cleanly to the canvas alpha channel. Plus our opacity slider blends the whole watermark over the photo, controllable from 5% (barely there) to 100% (fully opaque).

Is there any watermark on the output?

No. Output is pixel-clean - exactly what you'd get if you'd applied the logo in Photoshop yourself.

100% browser-side · No upload · Free

Logo Watermark to Photos

Upload your brand logo and stamp it across single photos or batches of up to 30. PNG with transparent background works best - opacity and size sliders give you full control.

Drop photos to watermark

JPG, PNG, WebP, HEIC up to 40 MB each · stays in your browser · up to 30 at once

Never uploaded · 100% browser-side · settings remembered between sessions

No upload · stays in browserInstant · no waitingFree · no signup, no watermark

How it works

1
Drop photos to watermark
Up to 30 at once. Each photo decoded locally, ready for the watermark.
2
Upload your logo
Click Logo mode and pick your file. PNG with transparency is the best fit - the watermark scales as a percent of each photo's smaller dimension, so it sits proportionally on landscape and portrait sources alike.
3
Position, size, opacity, save
Drag to place, slider for size (5-80% of photo), slider for opacity (5-100%). Save all as ZIP or just the active photo.

Why use this online tool

Use your real logo

PNG, JPG, WebP - any image works. PNG with transparency keeps the original photo visible behind the watermark, instead of stamping a white box on top.

Proportional scaling

Size is a PERCENT of the photo's smaller side, so the same logo sits at the right relative scale across mixed photo sizes (12 MP iPhone next to 1080×1080 square).

Bulk consistency

One logo, one position, one opacity → applied identically to every photo in the batch. The brand stamp stays consistent across an entire shoot.

100% browser-side, free

Logo and photos never leave your device. No upload, no signup, no per-batch cost. Output is pixel-clean (no 'made with' overlay).

When to use it

Photographers with brand logos applying consistent identity across a wedding / event gallery
E-commerce sellers stamping product photos with shop logo for Etsy / Shopify
Real estate agents placing agency logo on listing photos before MLS upload
Designers showing draft mock-ups to clients with studio logo overlay
Influencers with pre-existing brand assets (PNG logos) for cross-platform consistency

Frequently asked questions

What logo format works best?: PNG with a transparent background - the watermark blends into the photo cleanly without a white box. JPG works but the white background shows. SVG isn't supported (we render to raster Canvas).
How big should my logo file be?: 256-512 px on the long side is plenty - logos scale down to ~25% of the photo's shorter dimension by default. Bigger logos just take longer to decode without improving final quality.
Can I save the logo for next time?: Image watermarks aren't persisted between sessions (the logo file is held in browser memory and can't be serialised to localStorage). Re-upload the logo at the start of each session - takes 2 seconds.
Will my logo's transparency be preserved?: Yes - PNG transparency maps cleanly to the canvas alpha channel. Plus our opacity slider blends the whole watermark over the photo, controllable from 5% (barely there) to 100% (fully opaque).
Is there any watermark on the output?: No. Output is pixel-clean - exactly what you'd get if you'd applied the logo in Photoshop yourself.

Related free tools

Watermark to Photo

Brand single photos or whole batches with a custom text or logo watermark. Drag-to-place, drop-shadow, opacity slider - then download a ZIP of all watermarked photos in one click. Up to 30 photos at once, 100% browser-side.

Text Watermark to Photos

Type your watermark - © your name, brand handle, copyright notice - and stamp it across single photos or batches of up to 30. 17 web fonts, full styling controls, drag-to-place.

Tile Watermark Across Whole Photo

Repeating diagonal pattern across the entire photo - the strongest discouragement against unauthorised reuse. Tunable spacing + rotation, applies to single photos or batches of up to 30.

Convert PNG to WebP

WebP keeps PNG's transparency support but with 60-80% smaller file sizes. Modern, fast, fully browser-side.

Need more than just logo watermark to photos?

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