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# PostgreSQL MD5() Function

The PostgreSQL `MD5()` function calculates the [MD5](https://en.wikipedia.org/wiki/MD5) hash of a string and returns the result in hexadecimal.

## Syntax

The following illustrates the syntax of the `MD5()` function:

```sql
MD5(string)
```

## Arguments

The `MD5()` function accepts one argument.

**1) `string`**

The `string` argument is the string of which the MD5 hash is calculated.

## Return value

The `MD5()` function returns a string in [`TEXT`](../postgresql-tutorial/postgresql-char-varchar-text) data type.

## Examples

The following example shows how to use the `MD5()` function to return the MD5 hash of the message `'PostgreSQL MD5'`:

```sql
SELECT MD5('PostgreSQL MD5');
```

The result is:

```
        md5
----------------------------------
 f78fdb18bf39b23d42313edfaf7e0a44
(1 row)
```

In this tutorial, you have learned how to use the PostgreSQL `MD5()` function to calculate the MD5 hash of a string.

---

## Related docs (String Functions)

- [ASCII](https://neon.com/postgresql/string-functions/ascii)
- [CHR](https://neon.com/postgresql/string-functions/chr)
- [CONCAT](https://neon.com/postgresql/string-functions/concat-function)
- [CONCAT_WS](https://neon.com/postgresql/string-functions/concat_ws)
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- [INITCAP](https://neon.com/postgresql/string-functions/initcap)
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- [LOWER](https://neon.com/postgresql/string-functions/lower)
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- [RIGHT](https://neon.com/postgresql/string-functions/right)
- [RPAD](https://neon.com/postgresql/string-functions/rpad)
- [RTRIM](https://neon.com/postgresql/string-functions/rtrim)
- [SPLIT_PART](https://neon.com/postgresql/string-functions/split_part)
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