unaccent

Extensions

unaccent

unaccent : text search dictionary that removes accents

Overview

ID	Extension	Package	Version	Category	License	Language
4990	unaccent	unaccent	`1.1`	FUNC	PostgreSQL	C

Attribute	Has Binary	Has Library	Need Load	Has DDL	Relocatable	Trusted
--s-dt-	No	Yes	No	Yes	no	yes

Relationships
See Also	pg_trgm fuzzystrmatch citext btree_gist btree_gin prefix dict_xsyn dict_int

Packages

PG18	PG17	PG16	PG15	PG14
1.1	1.1	1.1	1.1	1.1

This is a built-in contrib extension ship with the PostgreSQL kernel

Install

Create this extension with:

CREATE EXTENSION unaccent;

Usage

unaccent: text search dictionary for accent removal

Removes accents (diacritic signs) from text. Can be used as a text search dictionary or as a standalone function.

CREATE EXTENSION unaccent;

Functions

Function	Description
`unaccent(text)`	Remove accents using the default dictionary
`unaccent(dictionary regdictionary, text)`	Remove accents using a specific dictionary

Text Search Usage

-- Test the dictionary
SELECT ts_lexize('unaccent', 'Hôtel');
-- {Hotel}

-- Create an accent-insensitive French text search config
CREATE TEXT SEARCH CONFIGURATION fr (COPY = french);
ALTER TEXT SEARCH CONFIGURATION fr
  ALTER MAPPING FOR hword, hword_part, word
  WITH unaccent, french_stem;

SELECT to_tsvector('fr', 'Hôtels de la Mer');
-- 'hotel':1 'mer':4

-- Accent-insensitive search
SELECT to_tsvector('fr', 'Hôtel de la Mer') @@ to_tsquery('fr', 'Hotels');
-- true

Standalone Function Usage

SELECT unaccent('Hôtel');           -- Hotel
SELECT unaccent('café');            -- cafe
SELECT unaccent('résumé');          -- resume
SELECT unaccent('niño');            -- nino

Last updated on 2026-03-24

dict_int pg_repack