Question 1

Are my images uploaded to your server?

Accepted Answer

No. All image processing happens entirely in your browser using WebAssembly-based compression libraries. Your images never leave your device. This also means there are no file size limits or privacy concerns.

Question 2

What is the difference between lossless and lossy compression?

Accepted Answer

Lossless compression reduces file size without any quality degradation — the decompressed image is pixel-for-pixel identical to the original. Lossy compression achieves much higher compression ratios by discarding some visual data, which can reduce quality but is often imperceptible at moderate settings. PNG supports lossless compression; JPEG is inherently lossy.

Question 3

Should I use WebP instead of PNG or JPEG?

Accepted Answer

WebP typically achieves 25–35% smaller file sizes than JPEG and up to 50% smaller than PNG at equivalent quality. It is supported by all modern browsers (Chrome, Firefox, Safari, Edge). For web use, converting to WebP is recommended whenever you need both quality and small file sizes.

Question 4

What JPEG quality setting should I use?

Accepted Answer

For web images, a quality setting of 75–85% is usually a good balance between visual quality and file size. Values below 60% can introduce noticeable artifacts, especially around edges and text. Photographs typically tolerate higher compression than graphics with text or sharp lines.

Question 5

Can I compress multiple images at the same time?

Accepted Answer

Yes. The tool supports batch processing — drag and drop multiple files and each one is compressed with your chosen settings. You can then download each image individually or all of them together as a ZIP archive.

Image Reducer