Is my image uploaded to a server?

No. Compression runs entirely in your browser. Your image never leaves your device.

Which formats are supported?

Input: any image format your browser can decode (JPG, PNG, WebP, GIF, BMP). Output: JPEG or WebP (lossy compression). PNG does not benefit meaningfully from this tool.

What quality setting should I use?

80% is a good default for photos — significant size reduction with minimal visual difference. Drop to 60-70% for thumbnails. Use 90%+ if the image has fine detail you want to preserve.

Why does image size matter for SEO and performance?

Image weight is the #1 cause of slow page loads on most sites. Google's Core Web Vitals (LCP) penalize heavy images, mobile users on cellular pay for the bytes, and conversion drops measurably above 3-second loads.

When should I convert to WebP instead of compressing JPEG?

WebP typically beats JPEG by 25–35% at the same visual quality and is supported by all modern browsers. For new uploads where browser support is fine, output WebP. Keep JPEG for legacy email/embed contexts.

Image Compressor

Image Tools· 9 tools

Free online image compressor. Upload a JPG, PNG, or WebP image and choose a quality level to shrink file size. Nothing is uploaded to a server — compression happens entirely in your browser using the Canvas API.

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Quality: 80%

Output Format

Frequently Asked Questions

References

Optimize your images — web.dev guide — Google web.dev

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Frequently Asked Questions

References and sources

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