Compress images online
Reduce JPG, PNG, and WebP file sizes while maintaining crystal-clear visual quality. 100% private in your browser.
Select image to compress
Drag and drop your JPG, PNG, or WebP file here, or click to browse from your device.
How to compress images online
Follow three simple steps to minimize file sizes while keeping crystal-clear quality.
Select your images
Drag and drop your JPG, PNG, or WebP files into the dropzone above, or browse your device.
Choose compression level
Pick an intuitive preset or use the compression slider to dial in the exact compression level you desire.
Inspect and download
Use the split slider to verify visual sharpness, then download your optimized images instantly.
Key features of Velenstac Image Compressor
100% Client-side privacy
All image compression takes place locally in your web browser. Your confidential photos never leave your computer.
Interactive split comparison
Drag the interactive before and after slider to check pixel sharpness and ensure no visual degradation occurred.
Instant local processing
Compress single images directly using your computer or phone's local processing power with zero upload latency.
Preserves original format
Your JPGs stay JPGs and your PNGs stay PNGs. File formats are strictly preserved without unwanted conversion.
Zero upload delays
Because files are processed directly on your hardware, compression happens instantly without waiting for cloud uploads.
Custom compression control
Choose between intuitive presets or activate the custom compression slider to dial in the exact compression level you need.
Frequently asked questions
How much can I reduce image file size without losing quality?
Most JPG and WebP images can be compressed by 60% to 80% using our Balanced preset without noticeable visual degradation to the human eye. Our interactive split slider lets you inspect pixel-by-pixel before downloading.
Are my photos uploaded to any external server?
No. All image compression operations happen 100% in your local browser using client-side HTML5 Canvas. Your images are never sent to our servers or stored in any cloud database.
Which image format offers the best compression?
WebP generally offers superior compression efficiency compared to standard JPEG and PNG formats. It supports both lossy compression and alpha transparency, typically yielding files that are 25% to 35% smaller than comparable JPEGs.
What is the maximum file size supported?
You can compress images up to 50MB in size. Because processing occurs entirely in your browser using local device memory, there are no artificial server upload limits.
Can I compress PNG images with transparent backgrounds?
Yes. Our compression algorithm uses intelligent color quantization and dithering that preserves alpha transparency while significantly reducing PNG file sizes.