Lossless Compress

Reduce file size without losing a single pixel. 100% quality preserved, always.

Drag & drop PNG, JPEG, or WebP — click to browse, or paste from clipboard

Lossless mode — no quality loss. Pixels are preserved exactly as the original.

Original Size

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Compressed Size

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Saved

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Compress to see savings

Frequently Asked Questions

What's the difference between lossless and lossy compression?

Lossless compression reduces file size without any quality loss — every pixel is preserved exactly. Lossy compression achieves smaller files by discarding some image data, which can reduce visual quality. This tool uses lossless only.

How much can lossless compression reduce file size?

Typically 10-30% for PNGs and 5-15% for JPEGs. PNGs with large solid-color areas compress best. JPEGs are already well-optimized, so savings are smaller. Results vary based on image content.

Which format compresses best losslessly?

WebP typically achieves the best lossless compression, followed by PNG. JPEG lossless compression offers modest savings since JPEG is inherently lossy. Converting to WebP can yield 25-35% smaller files.

Will lossless compression affect my image quality?

Absolutely not. Lossless compression is mathematically guaranteed to produce an identical image when decompressed. Every single pixel value remains unchanged.

Is my image uploaded to a server?

No. All compression happens locally in your browser using Canvas API. Your images never leave your device, ensuring complete privacy.