Choose an image
Select a JPG, PNG, or WebP file. The browser opens it locally and shows the original file size.
Image Compressor
Make JPG, PNG, and WebP images smaller. Your image is processed locally and never uploaded.
Your compressed image
—Original
—New size
—Dimensions
How to reduce an image file size
Optimize a photo or graphic for websites, email, forms, and messaging without sending the original image to a remote compression service.
Choose format and quality
Try JPG or WebP at 75–85% for photographs. Use PNG when lossless detail or transparency matters.
Compare and download
Review the preview, dimensions, and size reduction before saving the optimized image.
Compress JPG, PNG, or WebP privately
The source image is decoded and re-encoded inside your browser. JPG output uses a dedicated MozJPEG encoder, while WebP and PNG use the browser's image capabilities. No image content or filename is sent to FreNiMi for processing.
Compression results depend on the source. Detailed photographs usually shrink more than flat graphics that are already optimized. Re-encoding an already compressed image can make it slightly larger, so compare the displayed original and output sizes before downloading.
Choosing an output format
- WebP: a strong default for smaller images used on modern websites.
- JPG: widely compatible and well suited to photographs without transparency.
- PNG: lossless and useful for logos, screenshots, and transparent graphics, but often larger.
Frequently asked questions
Are my photos uploaded?
No. Supported images stay on your device and are processed in browser memory.
What quality setting should I use?
Start around 80% for a photograph, inspect the preview, and lower the setting gradually when a smaller file matters more than fine detail.
Why can PNG output stay large?
PNG is lossless and does not use the quality slider like JPG or WebP. Choose WebP or JPG when the smallest practical file is the priority.
Does compression resize the image?
No. This tool preserves the pixel dimensions. Use the Image Resizer when you also need to change width or height.