Add a watermark
Add a text or image watermark, privately.
100% local processing: no upload to a server. Your files stay on your device.
1
Drop your files
Drop one or more files.
2
Choose a setting
Adjust options (format, quality, ratio…).
3
Download
Download the result, with the localoptim_ prefix automatically.
Drag and drop here
Drag and drop here, or use the button. You can also drop directly onto the list to reorder.
100% local processing: no upload to a server. Your files stay on your device.
Generator
Set the options, then start the generation.
100% local processing: no upload to a server. Your files stay on your device.
Files
You can reorder by drag and drop.
Preview
Preparing
Downloads
Frequently asked questions
Import the image, add your text/logo, position it, then export. Everything runs locally.
No. Local processing (privacy-first), no server upload.
Yes, tweak opacity, size, and position for a subtle watermark.
Yes: no storage, no personal data collected.
WebP/JPG for photos, PNG if you need transparency.
A visible watermark discourages theft, but also consider metadata and export size.
Settings
Help