Image Compressor
Reduce image file size. 100% local processing.
How does image compression work?
Image compression reduces file size by removing redundant or less perceptible data to the human eye. Our tool uses the browser's JPEG algorithm, which applies controllable lossy compression: you choose the balance between quality and size with the slider.
Unlike other services, NexTools processes your images 100% locally in your browser. This means your photos never leave your device, ensuring total privacy. Nothing is stored on any server.
Compressing images is essential for websites (improves loading speed and SEO), social media (avoids size limits), emails (lighter attachments), and storage (saves space on your device).
Frequently asked questions
Is quality lost when compressing?
It depends on the compression level. At 70-80% quality, the size reduction is significant and the quality loss is practically imperceptible to the human eye.
Are my images uploaded to any server?
No. All processing is done in your browser using the JavaScript Canvas API. Your images never leave your device.
What formats are supported?
It accepts JPG, PNG, WebP and most image formats. The result is downloaded as a compressed JPG.
Can I compress multiple images at once?
Yes, you can select or drag multiple files. Each image is compressed individually and you can download them all with a single click.
Want to learn more? Read our complete guide →