Image Compressor
Compress images online for free. Adjust quality with a slider and download instantly. 100% client-side, no server upload needed.
About This Tool
Image Compressor reduces the file size of your JPEG, PNG, and WebP images by adjusting the compression quality level. Drag the quality slider to find the perfect balance between file size and visual fidelity — essential for speeding up websites, meeting email attachment limits, and saving storage space.
Drag & drop image or click to upload
JPG, PNG, WebP
How to Use
- Upload an image by dragging or clicking the upload area.
- Adjust the quality slider (1-100%).
- Select the output format (JPEG, PNG, WebP).
- Click Compress and review the result.
- Click Download if satisfied.
Frequently Asked Questions
What quality setting should I use?
70-80% quality is ideal for most cases — significant size reduction with minimal visible difference. Use 60-70% for web, 85-95% for print.
Why can't I adjust quality for PNG?
PNG is a lossless format, so quality levels don't apply like JPEG/WebP. To reduce PNG file size, consider reducing the image dimensions instead.
Is my image uploaded to a server?
No. All processing happens in your browser using the Canvas API. Your images are never sent to any external server, ensuring complete privacy.
Which format produces the smallest file?
WebP offers the smallest file size at equivalent quality. JPEG is great for photos, while PNG is best for images requiring sharpness like text or icons.
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How It Works
After you drop an image into the tool, it is decoded and drawn onto an HTML5 Canvas. The Canvas API's toBlob() method is then called with an adjustable quality parameter (0 to 1 for JPEG/WebP) to re-encode the image at the desired compression level. For PNG files, a quantization algorithm reduces the color palette to achieve smaller file sizes. A real-time preview and file-size comparison let you fine-tune the result before downloading.
All encoding and decoding happens inside your browser using the Canvas API and JavaScript — your images never leave your device, so your files remain completely private.
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