Question 1

How does image compression work?

Accepted Answer

The compressor uses the browser's Canvas API to re-encode your image at a lower quality level. This reduces file size while keeping the image visually similar. The output is always in JPEG format for optimal compression.

Question 2

What quality level should I use?

Accepted Answer

For web use, 70-80% is usually a good balance between file size and visual quality. For printing, use 90%+. Below 50%, you may notice visible artifacts.

Question 3

Is my image uploaded to a server?

Accepted Answer

No, all compression happens entirely in your browser using the Canvas API. Your images never leave your device.

Question 4

What's the maximum file size I can compress?

Accepted Answer

There's no hard limit, but very large images (over 50MB) may slow down depending on your device and browser. Most typical photos work fine.

Question 5

Why is the output always JPEG?

Accepted Answer

JPEG offers the best compression ratio for photographs. The quality slider directly controls JPEG compression level, giving you precise control over the file size vs quality tradeoff.

Image Compressor

Frequently Asked Questions