Convert images
Change your image format (PNG, JPG, WebP…) locally.
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, choose an output format, then download the result.
No. Local conversion in your browser (privacy-first).
WebP for the best balance. JPG for photos. PNG for transparency and graphic elements.
JPG/WebP at too low quality can create artifacts. Adjust quality if available.
Yes: zero upload, zero storage, no account.
Support for some formats depends on the browser. WebP is widely supported today.
Also reduce dimensions (px): size depends on resolution as much as format.
Settings
Higher = better quality, heavier file.
Help