Compress images directly in your browser
Reduce the file size of JPG, PNG, or WEBP images locally in your browser – without uploading them to a server.
100% in the browser
Your images stay on your device. No upload, no cloud, no servers.
Fast & free
Compress images in seconds – no account and no installation required.
Smaller files
Ideal for websites, emails, forms, and faster uploads.
Compress images online – directly in your browser
With the free image compressor from iStyle.ch, you can reduce JPG, PNG, and WEBP files directly in your browser. Image processing runs entirely locally on your device, with no server upload required. This gives you maximum privacy, fast processing, and a simple user experience right in your browser.
How does image compression work?
Choose your image, set the output format, quality, and optionally a maximum width and height, then start compression with one click. The tool creates an optimized version of the file locally in your browser, ready for immediate download.
JPG, PNG, and WEBP
Compress the most important image formats directly in your browser – ideal for web, email, forms, and documents.
Adjust quality flexibly
Decide how strongly your image should be compressed and find the best balance between quality and file size.
Reduce width and height
Optionally shrink the image dimensions as well to optimize files even further and meet upload limits.
No data storage
Your images are never transferred to our servers. Everything stays local and private in your browser.
When is image compression useful?
Image compression is especially useful when you want to reduce photos and graphics for websites, online shops, job applications, emails, forms, or messaging apps. Smaller files load faster, save storage space, and improve website performance and the user experience on mobile devices.
Frequently asked questions
Is my image uploaded?
No. The entire image compression process runs locally in your browser. Your file never leaves your device.
Which format creates the smallest files?
WEBP often produces the smallest files with good quality. JPG is highly compatible and usually ideal for photos. PNG is better suited for graphics or images with transparency.
Will the image quality stay good?
That depends on your settings. With moderate compression, quality usually remains very good while the file size decreases significantly.
Can I also change the image dimensions?
Yes. You can define a maximum width and height and optionally keep the aspect ratio.
Compression options
Set the format, quality, and maximum dimensions for your image.
Output
Choose the format and quality for the compressed image.
Only relevant for JPG and WEBP. Higher quality usually means larger files.
Resize image
Optionally define the maximum width and height for your image.
Preview
Compare the original image and the compressed version directly in the tool.
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Your image has been compressed!
Your optimized image is ready to download.