Question 1

How does the image compressor work?

Accepted Answer

It uses the browser-image-compression library which applies JPEG/WebP encoding at your chosen quality level entirely inside your browser tab. No data is sent to any server.

Question 2

Are my images private?

Accepted Answer

Yes, completely. All processing happens on your own device using JavaScript. Your files never leave your browser and we have no technical ability to access them.

Question 3

Which formats are supported?

Accepted Answer

JPG/JPEG, PNG, and WebP as inputs. You can output to JPG or WebP. PNG output preserves transparency. For other formats like HEIC or AVIF, use the Image Converter tool first.

Question 4

Is there a file size or count limit?

Accepted Answer

There is no hard limit — you can compress up to 20 files at once, each up to 50 MB. Very large files may be slower depending on your device's CPU.

Question 5

What quality setting should I use?

Accepted Answer

75% is the default and works well for most photos — the difference from 100% is invisible to the human eye but saves 60–80% of the file size. For web use, 70–80% is ideal. For print or archiving, use 85–95%.

Free Online Image Compressor

How it works

Frequently asked questions