Image Resizer
Resize PNG, JPG, and WebP images to custom pixel dimensions or popular social media presets while locking aspect ratio.
Image Compressor
PopularCompress JPG, PNG, and WebP images locally in your browser with adjustable quality and side-by-side comparison.
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How to Use Image Compressor
- 1Drag and drop a JPG, PNG, or WebP image into the upload zone, or click to select a file from your device.
- 2Adjust the Compression Quality slider (1% to 100%) and choose an output format (JPG, WebP, or PNG).
- 3Compare the original and compressed image previews alongside exact byte sizes and percentage savings.
- 4Click 'Download Compressed Image' to save the optimized file directly to your device.
Key Features & Privacy
- ✦100% client-side HTML5 Canvas compression with zero server uploads.
- ✦Real-time side-by-side visual preview of original and compressed output.
- ✦Honest size differential warning if re-encoding increases file size (such as PNG or already heavily compressed files).
- ✦Supports JPG, PNG, and WebP input and output formats with transparent background fill options.
Frequently Asked Questions
Is this image compression lossless or lossy?
JPEG and WebP compression use adjustable lossy encoding via the browser's native Canvas API to achieve significant file size reductions. PNG output uses lossless encoding, which may not shrink photographic images unless converted to WebP or JPEG.
Why can the output size sometimes be larger than the original?
If an image is already heavily optimized or you re-encode a low-quality JPEG at 95%+ quality or as PNG, the browser's Canvas encoder can produce a larger file. The tool clearly alerts you whenever the output exceeds the original file size.
Are my photos uploaded to any external server?
No. Every byte of your image is decoded and compressed inside your browser's memory using HTML5 Canvas and Blob URLs.
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