How the target size works
When you enter a size in KB, the converter tries several quality levels for each image. It keeps the highest quality whose file is still under your limit, so you get the best looking picture that fits. Each result shows the quality that was chosen. Leave the box empty to use the quality slider as it is.
When a size limit is useful
- Upload forms with a maximum file size, such as applications and profile photos.
- Email newsletters, where each image adds to the load time.
- Performance budgets, for example no hero image above 150 KB.
- Content management systems with small default upload limits.
If the size cannot be reached
Quality can only go so low before a picture looks bad. If a large photo cannot fit the limit even at the lowest quality, the tool says so and gives you the smallest file it could make. The fix is to make the image smaller as well: use the Maximum size option to limit the longest side to 1920, 1280 or fewer pixels. Fewer pixels reduce the file size more than a lower quality does, and they hurt the picture less.
Good starting sizes
| Use | Longest side | Target |
|---|---|---|
| Full width hero image | 1920 px | 150 to 250 KB |
| Blog or article photo | 1280 px | 60 to 120 KB |
| Product thumbnail | 600 to 800 px | 20 to 50 KB |
| Profile photo | 400 to 600 px | 20 to 40 KB |
The tool runs in your browser, so the photos stay on your device. For plain conversion at a fixed quality use the JPG to WebP converter, and for folders of images see bulk JPG to WebP. If the upload form only accepts JPG, use the image compressor, or convert WebP to JPG at a target size, and to set exact dimensions use the image resizer. The JPG vs WebP guide explains the trade-offs.