Drop your images
JPG, PNG and WebP. Mixed sizes are fine — the watermark scales to each image automatically.
Watermark a whole batch of images
Type your text once, drop 20 photos, get a ZIP back with every image watermarked in the same corner. Nothing uploaded.
Drop images here
or · JPG, PNG, WebP, GIF
How it works
Type your watermark text
Enter your shop name, handle or URL in the watermark field. Pick corner and opacity.
Download the ZIP
Every image comes back stamped and renamed, ready to publish.
Questions
Why watermark at all?
If you post product photos, artwork or stock images online, an unwatermarked file gets scraped and reused. A small corner watermark makes that reuse worthless without ruining the image.
Will the watermark cover the important part of my photo?
You choose the corner and the opacity. Keep it under 40% opacity and in a corner and it stays readable without hiding the subject.
Can I use a logo image instead of text?
The free web version does text only. Bulk Image Kit ($19) supports PNG logo watermarks with transparency, plus custom positioning and per-image overrides.
Is anything uploaded to a server?
No. The watermark is drawn onto a canvas in your browser. Your files never leave your computer.
Watermarking approaches compared
A watermark can protect an image or ruin it. The variables are position, opacity, size, and whether it can be removed.
| Case | Value | Why it matters |
|---|---|---|
| Small corner text, 25–35% opacity | Deterrent | Protects against casual reuse while staying invisible to real viewers. The usual right answer. |
| Large centred text, 50%+ | Strong protection | Destroys the image for everyone, including buyers. Only for pre-purchase proofs. |
| Tiled / diagonal repeated | Anti-crop | Cannot be cropped out. Used by stock agencies, unreadably ugly for marketing. |
| PNG logo overlay | Brand | Professional look, needs a transparent PNG. Not available in the free web version. |
| Invisible / steganographic | Forensic | Does not survive re-encoding or resizing. Useful only for tracking a leaked original. |
| Bottom strip with solid background | Caption | Readable on any photo but visibly reduces the image area. |
Five mistakes that waste the most time
Watermarking with 100% opacity on the main subject
Nobody can see what they are buying. Put it in a corner.
Using a huge font covering a third of the image
You lose the sale and the theft is still trivial to crop.
White text on a light background
Disappears. This tool adds a dark shadow behind the text for that reason.
Watermarking before resizing
The watermark gets resized with the image and can end up blurry relative to the sharp photo. Watermark last.
Forgetting the PNG case
A white watermark on a transparent PNG turns into a white rectangle when opened in a viewer with a light background.
Free web version vs the $19 desktop app
| Free, this page | Bulk Image Kit $19 | |
|---|---|---|
| Watermark types | Text only | Text + PNG logo overlay |
| Positions | 5 fixed | 5 fixed + exact coordinates |
| Opacity control | 5–90% | 0–100% per image |
| Batch limit | 20 images | Unlimited |
| Per-image text | No — one text for the batch | Yes, different text per file |
| Offline | After first load | Always |
More questions
Can a watermark be removed?
A corner text watermark can be cropped. A centred one can be inpainted, though it leaves artefacts. Nothing survives a determined editor, so treat watermarks as a deterrent, not protection.
What opacity should I use?
25–35% for a corner mark on a photo. High enough that a casual repost carries your brand, low enough that the image still sells.
Does the watermark apply to every image in the batch?
Yes. The free version uses one text and one position for the whole batch. The desktop version allows per-image settings.
What about PDF or video watermarking?
Out of scope. This tool handles raster images only.
Need 500 photos watermarked, not 20?
Bulk Image Kit does unlimited batch watermarking with PNG logo overlays, per-image positioning, plus resize, compress and rename — one offline app, one-time $19. No subscription, nothing uploaded.
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