Every gif reverser on the internet sucks, and I've been playing around with gif editing in the browser, so this seemed like a fun thing to do.
Uses:
- jsgif for decoding: https://github.com/shachaf/jsgif
- gif.js for encoding: https://github.com/jnordberg/gif.js
Requires web workers and html5 file API support. Should work in Latest FF, Safari, Chrome and IE10+.