﻿---
title: Token filter reference
description: Token filters accept a stream of tokens from a tokenizer and can modify tokens (eg lowercasing), delete tokens (eg remove stopwords) or add tokens (eg...
url: https://www.elastic.co/elastic/docs-builder/docs/2964/reference/text-analysis/token-filter-reference
products:
  - Elasticsearch
---

# Token filter reference
Token filters accept a stream of tokens from a [tokenizer](https://www.elastic.co/elastic/docs-builder/docs/2964/reference/text-analysis/tokenizer-reference) and can modify tokens (eg lowercasing), delete tokens (eg remove stopwords) or add tokens (eg synonyms).
Elasticsearch has a number of built-in token filters you can use to build [custom analyzers](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2964/manage-data/data-store/text-analysis/create-custom-analyzer).