Why never gives the same result than others crc32?

[ikarius6]

I was trying with a single string and im getting wierd result with negative numbers...

https://www.functions-online.com/crc32.html
4ff9fc6e4e5d5f590c4f2134a8cc96d1 = 3264575876

Your code:
-1030391420

[reviewher]

It's mentioned in the README:

The return value is a signed 32-bit integer.

This decision was made for performance reasons.

The website you linked is giving you the unsigned value. If you want to convert to unsigned, use an unsigned right shift: (-1030391420) >>> 0 == 3264575876 will give you the correct value.

Note: The web demo http://oss.sheetjs.com/js-crc32/ includes both forms:

That output is generated as follows:

var txt = document.getElementById('rawdata');
var crc32_signed = X.str(txt.value);
var crc32_unsigned = crc32_signed >>> 0;