Image Watermark
Stamp text or a logo onto images, once or tiled across the frame.
Input
Settings
Run
Results
Results will appear here once you run the tool.
About Image Watermark
Stamp text or a logo onto images, once or tiled across the frame. Drop one or more files into Image Watermark — it handles up to 100 at a time.
Your files stay on your device. ZyncTools has no upload step: the file is read in your browser, processed there, and handed straight back to you. There is no account, no watermark and no size cap beyond what your own device can hold.
Settings. Image Watermark gives you control over watermark type, watermark text, logo file, text size, font, bold, text colour and add a dark outline for legibility, plus 8 more.
Also known as: watermark, logo, copyright, branding, stamp.
How to use Image Watermark
- Add your input. Drop your files onto the upload area, or click to browse. You can add up to 100 at once, and they are read in your browser rather than uploaded.
- Choose your settings. Adjust watermark type, watermark text, logo file and the other 13 settings to suit what you need.
- Run the tool. Press Run. Processing happens on your own device, so the time it takes depends on your machine rather than a queue.
- Save the result. Copy the output, or press Download to save it. Nothing is kept once you close the tab.
Frequently asked questions
Are my files uploaded when I use Image Watermark?
No. Image Watermark runs entirely inside your browser. Your file is read locally, processed on your own device, and handed straight back to you. You can confirm this yourself: open your browser's developer tools, watch the Network tab, and run the tool — no request carries your data anywhere.
Is Image Watermark free?
Yes, completely. No account, no sign-up, no watermark on your output, and no cap on how many times you can use it. The project is open source under the AGPL licence.
Is there a file size limit?
There is no server limit, because nothing is uploaded. The practical ceiling is your device's memory — on a modern laptop, files up to a few hundred megabytes are comfortable, while phones handle less. If a tab becomes unresponsive, the file was too large for the memory available.
Can I process several files at once with Image Watermark?
Yes — up to 100 at a time. When there are more than a few results they are packaged into a ZIP so you get everything in one download.
Does Image Watermark work offline?
Mostly. The site caches itself after your first visit, so it keeps working without a connection. Tools that need a specialised library — PDF editing, OCR, QR codes, MP3 encoding — need a connection the first time you run them, then that library is cached too.