Hacker News Reader

Gaining the confidence of the user is not easy:

1) I think you should state explicitly that the compression is lossless (if it is);

2) You should provide some kind of demos/examples to look at.

Good job anyway!

Image compression is lossless.. I really should call that out on the home page. Demo / examples are definitely on my list.. here's an example PR for you: https://github.com/shrinkrayio/demo-images/pull/6

Also, do you preserve metadata (EXIF etc.)?

I believe metadata gets stripped out, which is how I get some lossless size reduction for jpgs. In my experience, this is not something that we've been interested in preserving on our images (use case - websites).

Would you be looking at using this to compress some photos for personal use, or for a photography website? What would be your use case?

JPGs can be optimized without losing metadata. Google "jpegtran". It does some optimizing of the data representation while staying loseless.

Reply on news.ycombinator.com