# Difference between analyzer and normalizer **URL:** \ **Category:** Elasticsearch\ **Created:** [October 30, 2019, 3:36pm UTC](https://discuss.elastic.co/t/difference-between-analyzer-and-normalizer/205897 "2019-10-30T15:36:44Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![daniele.saccon](https://avatars.discourse-cdn.com/v4/letter/d/4af34b/32.png) [@daniele.saccon](https://discuss.elastic.co/u/daniele.saccon)\ **Post date:** [October 30, 2019, 3:36pm UTC](https://discuss.elastic.co/t/difference-between-analyzer-and-normalizer/205897/1 "2019-10-30T15:36:44Z")
Hello, what is the difference between analyzer and normalizer? Thanks Daniele ---
**Author:** ![Glen\_Smith](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/glen_smith/32/111656_2.png) [@Glen\_Smith](https://discuss.elastic.co/u/Glen_Smith)\ **Post date:** [October 30, 2019, 11:55pm UTC](https://discuss.elastic.co/t/difference-between-analyzer-and-normalizer/205897/2 "2019-10-30T23:55:39Z")
[Normalizers](https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-normalizers.html#analysis-normalizers) > Normalizers are similar to analyzers except that they may only emit a single token. As a consequence, they do not have a tokenizer and only accept a subset of the available char filters and token filters. Only the filters that work on a per-character basis are allowed. For instance a lowercasing filter would be allowed, but not a stemming filter, which needs to look at the keyword as a whole. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 27, 2019, 11:55pm UTC](https://discuss.elastic.co/t/difference-between-analyzer-and-normalizer/205897/3 "2019-11-27T23:55:43Z")
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