How to watermark an image with OnyxPDF
- Drop your photos into the tool.
- Choose a text watermark or upload a logo image.
- Set the position, size and opacity — the preview updates live.
- Click “Watermark Images” and download the stamped copies.
Why do it in your browser instead of uploading?
- Text or logo: protect photos with a © line, or brand them with your actual logo.
- Live preview with position/size/opacity control — the same control set as PDF watermarking here.
- Batch stamping with no upload; iLoveIMG-style batch flow without the account or the task caps.
- No OnyxPDF branding is ever added to your output.
Good to know (honest limits)
- Watermarks deter casual reuse; they can be cropped or edited out by a determined person — they are a claim of ownership, not copy protection.
- The stamp is baked into the downloaded copies; keep your unwatermarked originals.
Frequently asked questions
Text or logo — which watermark is better?
Text is fastest for © lines and names. A logo looks more professional for portfolios and product photos. Both support transparency, so neither has to dominate the photo.
What opacity should I use?
Around 30–50% is visible without ruining the photo. For proof galleries you send to clients before payment, tiled mode at moderate opacity is the standard trick.
Can I watermark many photos at once?
Yes — one settings pass stamps the whole batch identically.
Are my photos uploaded?
No. Watermarking runs in your browser.