Free private image tool
Image Compressor
Reduce image file size with a quality level you control.
- ✓Choose output quality and format.
- ✓Optionally limit the maximum width.
- ✓Compare original and compressed sizes.
Local image tool
Choose an image and create your result.
Original image
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Your image is ready
- Original file
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- New file
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- Size change
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- Dimensions
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Created locally in this browser. This image was not uploaded.
Your images never leave your device.
Processing happens locally. Nothing is uploaded or saved.
01
How this check works
- 1
Choose an image from your device.
- 2
Adjust the available output settings.
- 3
Create and download the result in your browser.
02
What this result tells you
Compress JPG, PNG, and WebP images locally in your browser. Adjust quality and maximum width, compare file sizes, and download the result.
- Choose output quality and format.
- Optionally limit the maximum width.
- Compare original and compressed sizes.
Practical examples and limitations
When to use this tool
Compress a finished image when file size matters for a webpage, email or upload limit. Choose sensible dimensions first: encoding a huge image at low quality may look worse than a moderately resized image at higher quality. This tool offers quality and format controls rather than promising that every file will become smaller.
Worked example
Start with a JPG or WebP quality of 85, save the output, then compare it with the original. Try 70 only if the first copy is still too large. Inspect text, skies and detailed textures. If an output is 180 KB instead of 600 KB, the reduction is 70%; that arithmetic does not describe the visual quality.
What to check before using the result
PNG ignores the lossy quality slider and a re-encoded PNG may grow. A screenshot with sharp lettering may suit PNG better than JPG. Transparent images need PNG or WebP when transparency must survive. The result is a new encoded copy; inspect the actual downloaded file and avoid repeatedly compressing the previous output.
FAQ
Frequently asked questions
Which format usually makes the smallest image?+
WebP often produces a smaller file than JPEG at similar visual quality, but the best choice depends on the image and its destination. PNG is useful when lossless detail or transparency is essential.
Your images never leave your device.+
ImageMetaCheck reads your file with browser APIs on your device. The image is never sent to our server, stored in a database, or used for training.