Question 1

How do I compress a JPG to 100 KB?

Accepted Answer

Upload your image, enter 100 in the size box, choose KB, then press Compress. The tool uses a binary search to find the highest quality setting that keeps the output under 100 KB. If 100 KB is impossible at any quality, the tool will keep the lowest quality output and tell you.

Question 2

Does it work for PNG images too?

Accepted Answer

Yes. PNG and WebP images are re-encoded as JPEG with a target size. Transparent areas become white (or any color you choose). For best results with photos, the source is automatically flattened onto a background.

Question 3

Is there a quality loss?

Accepted Answer

Yes, because the output is a re-encoded JPEG. The tool searches for the highest quality factor that still meets your target size, so the visual quality is maximized. Source images that are already below the target are not re-encoded.

Question 4

What if my target is too small?

Accepted Answer

If the target size is smaller than the image can be compressed to (e.g. 5 KB for a 4K photo), the tool stops at quality 1 and tells you the smallest possible size it could achieve. You can then either increase the target or accept the smallest available output.