What is lossy vs lossless compression?

Lossy compression (used for JPEG) permanently removes some image data to reduce file size — quality degrades slightly but files are much smaller. Lossless compression (used for PNG) reduces size without removing any data — quality is preserved perfectly but files are larger.

Will compression reduce image quality visibly?

At quality settings of 70–85%, JPEG compression is nearly indistinguishable to the human eye for photographs. Setting quality below 50% may introduce visible artifacts. This tool defaults to an optimal quality setting that balances size reduction with visual quality.

Is my image uploaded to a server?

No. All compression happens entirely in your browser. Your images are never uploaded or sent anywhere — complete privacy.

What formats does this tool support?

JPEG/JPG and PNG are supported. JPEG works best for photographs. PNG works best for graphics, logos, and images with transparency.

How much can image compression reduce file size?

JPEG images can typically be reduced 60–80% with minimal quality loss. PNG files vary — images with few colors compress more than detailed photographs. Switching from PNG to JPEG for photos can reduce size by 80%+.

Image Compressor

Image

Compress JPEG and PNG images without visible quality loss.

Drop your image here

or click to browse · JPEG, PNG, WebP

How to use Image Compressor

1Click "Choose Image" or drag and drop a JPEG or PNG file.
2Use the quality slider to control compression level (lower = smaller file).
3See the original vs. compressed file size in real time.
4Click "Download Compressed Image" to save the result.

Frequently Asked Questions

Learn More

Image Compression — Wikipedia

How image compression algorithms work (lossy vs lossless)

JPEG — Wikipedia

How JPEG compression works and its trade-offs

PNG — Wikipedia

PNG format, lossless compression, and transparency support

Data Compression — Wikipedia

Principles of data compression used in image formats

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Image Compressor

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Frequently Asked Questions

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