# Change Case

### Description
Changes the letter-case of all strings in a `[OBJ,STRING]` input.

### Input
- `SOURCE [OBJ,STRING]`: a 2-column input with an object-string pair. Typically obtained with the `Extract string` block

### Output
- `RESULT [OBJ,STRING]`: the pairs from `SOURCE`, where the string has been modified
- `STRINGS [STRING]`: the modified strings, without the object they were paired to

### Parameters
- `Case`:
  - `lower-case`: convert all letters to lower case
  - `upper-case`: convert all letters to upper case

Output scores can be [aggregated](docs://score_aggregation) and/or [normalised](docs://score_normalisation).