Image Compressor
Compress images in your browser. No upload needed.
Drag & drop your image here
or click to browse
Supports JPG, PNG, WebP
Your image is processed in your browser and is not uploaded to our server.
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How to use Image Compressor
1
Drag and drop an image or click to browse. Supported formats: JPG, PNG, WebP.
2
Adjust the compression quality slider (1–100). Lower values produce smaller files with more compression.
3
Optionally, choose an output format and set maximum width/height for resizing.
4
Click "Compress Image" to process. View the before/after comparison and download the result.
How it works
This image compressor uses the HTML5 Canvas API to process images entirely in your browser:
- Loading: The selected image file is loaded as a data URL and rendered into a browser Image element.
- Resizing (optional): If you specify a maximum width or height, the image is proportionally scaled down to fit within those bounds while maintaining the aspect ratio.
- Compression: The image is drawn onto an HTML Canvas element, then exported using
canvas.toBlob()with a quality parameter. For JPEG and WebP, lower quality values produce smaller files. PNG is lossless, so the quality slider does not apply. - Privacy: Your image never leaves your device. All processing is done locally using browser APIs. No data is uploaded to any server.
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Frequently Asked Questions
Is my image uploaded to a server?
No. Your image is processed entirely in your browser using the Canvas API. It is never uploaded, transmitted, or stored on any server. Your privacy is fully protected.
What image formats are supported?
You can compress JPG/JPEG, PNG, and WebP images. You can also convert between these formats during compression. For example, you can compress a PNG and save it as WebP for better compression.
How does the quality slider work?
The quality slider (1–100) controls the compression level for lossy formats (JPEG and WebP). A quality of 70 is a good balance between file size and visual quality. Lower values produce smaller files but may introduce visible artifacts. PNG is a lossless format, so quality does not affect the output.
Can I resize images while compressing?
Yes. Enter optional maximum width and/or height values. The image will be proportionally scaled down to fit within those dimensions. If you only specify one dimension, the other is calculated automatically to maintain the aspect ratio.
Why is my PNG file not getting much smaller?
PNG is a lossless format, so the quality slider does not reduce file size significantly. For PNG compression, resizing is the most effective way to reduce file size. Alternatively, try converting to JPEG or WebP, which support lossy compression and can achieve much smaller file sizes.
Is there a file size limit?
There is no hard limit, but very large images (50MB+) may take longer to process and use more memory. The tool handles large files gracefully with a processing indicator. Since everything runs in your browser, performance depends on your device.