# Filters Overview
Filters transform values in templates. They are applied using the pipe (`|`) operator.
## Basic Usage
```html
## Chaining Filters
Multiple filters can be chained:
```html
## Filter Arguments
Many filters accept arguments:
```html
```
## Filter Categories
- [String Filters](filters/string.html) - Text transformation
- [Collection Filters](filters/collection.html) - Array/object operations
- [Number Filters](filters/number.html) - Math operations
- [Date Filters](filters/date.html) - Date formatting
- [HTML Filters](filters/html.html) - HTML processing
- [Encoding Filters](filters/encoding.html) - Encoding/decoding
- [Conditional Filters](filters/conditional.html) - Conditional logic
## Helper Directives
- [@map](filters/helpers.html#map) - Transform array elements
- [@filter](filters/helpers.html#filter) - Filter array elements
- [@each](filters/helpers.html#each) - Iterate with index
- [@reduce](filters/helpers.html#reduce) - Reduce to value
- [@flatten](filters/helpers.html#flatten) - Flatten arrays
- [@partition](filters/helpers.html#partition) - Split array