Blob.slice()

The slice() method of the Blob interface creates and returns a new Blob object which contains data from a subset of the blob on which it’s called.

Inputs: start An index into the Blob indicating the first byte to include in the new Blob. If you specify a negative value, it’s treated as an offset from the end of the Blob toward the beginning. For example, -10 would be the 10th from last byte in the Blob. The default value is 0. If you specify a value for start that is larger than the size of the source Blob, the returned Blob has size 0 and contains no data. end An index into the Blob indicating the first byte that will not be included in the new Blob (i.e., the byte exactly at this index is not included).