diff --git a/library/src/actions/base64Url/base64Url.test-d.ts b/library/src/actions/base64Url/base64Url.test-d.ts
new file mode 100644
index 000000000..bf03ecce2
--- /dev/null
+++ b/library/src/actions/base64Url/base64Url.test-d.ts
@@ -0,0 +1,49 @@
+import { describe, expectTypeOf, test } from 'vitest';
+import type { InferInput, InferIssue, InferOutput } from '../../types/index.ts';
+import {
+  base64Url,
+  type Base64UrlAction,
+  type Base64UrlIssue,
+} from './base64Url.ts';
+
+describe('base64Url', () => {
+  describe('should return action object', () => {
+    test('with undefined message', () => {
+      type Action = Base64UrlAction<string, undefined>;
+      expectTypeOf(base64Url<string>()).toEqualTypeOf<Action>();
+      expectTypeOf(
+        base64Url<string, undefined>(undefined)
+      ).toEqualTypeOf<Action>();
+    });
+
+    test('with string message', () => {
+      expectTypeOf(base64Url<string, 'message'>('message')).toEqualTypeOf<
+        Base64UrlAction<string, 'message'>
+      >();
+    });
+
+    test('with function message', () => {
+      expectTypeOf(
+        base64Url<string, () => string>(() => 'message')
+      ).toEqualTypeOf<Base64UrlAction<string, () => string>>();
+    });
+  });
+
+  describe('should infer correct types', () => {
+    type Action = Base64UrlAction<string, undefined>;
+
+    test('of input', () => {
+      expectTypeOf<InferInput<Action>>().toEqualTypeOf<string>();
+    });
+
+    test('of output', () => {
+      expectTypeOf<InferOutput<Action>>().toEqualTypeOf<string>();
+    });
+
+    test('of issue', () => {
+      expectTypeOf<InferIssue<Action>>().toEqualTypeOf<
+        Base64UrlIssue<string>
+      >();
+    });
+  });
+});
diff --git a/library/src/actions/base64Url/base64Url.test.ts b/library/src/actions/base64Url/base64Url.test.ts
new file mode 100644
index 000000000..686236bf6
--- /dev/null
+++ b/library/src/actions/base64Url/base64Url.test.ts
@@ -0,0 +1,183 @@
+import { describe, expect, test } from 'vitest';
+import { BASE64_URL_REGEX } from '../../regex.ts';
+import type { StringIssue } from '../../schemas/index.ts';
+import { expectActionIssue, expectNoActionIssue } from '../../vitest/index.ts';
+import {
+  base64Url,
+  type Base64UrlAction,
+  type Base64UrlIssue,
+} from './base64Url.ts';
+
+describe('base64Url', () => {
+  describe('should return action object', () => {
+    const baseAction: Omit<Base64UrlAction<string, never>, 'message'> = {
+      kind: 'validation',
+      type: 'base64_url',
+      reference: base64Url,
+      expects: null,
+      requirement: BASE64_URL_REGEX,
+      async: false,
+      '~run': expect.any(Function),
+    };
+
+    test('with undefined message', () => {
+      const action: Base64UrlAction<string, undefined> = {
+        ...baseAction,
+        message: undefined,
+      };
+      expect(base64Url()).toStrictEqual(action);
+      expect(base64Url(undefined)).toStrictEqual(action);
+    });
+
+    test('with string message', () => {
+      expect(base64Url('message')).toStrictEqual({
+        ...baseAction,
+        message: 'message',
+      } satisfies Base64UrlAction<string, string>);
+    });
+
+    test('with function message', () => {
+      const message = () => 'message';
+      expect(base64Url(message)).toStrictEqual({
+        ...baseAction,
+        message,
+      } satisfies Base64UrlAction<string, typeof message>);
+    });
+  });
+
+  describe('should return dataset without issues', () => {
+    const action = base64Url();
+
+    test('for untyped inputs', () => {
+      const issues: [StringIssue] = [
+        {
+          kind: 'schema',
+          type: 'string',
+          input: null,
+          expected: 'string',
+          received: 'null',
+          message: 'message',
+        },
+      ];
+      expect(
+        action['~run']({ typed: false, value: null, issues }, {})
+      ).toStrictEqual({
+        typed: false,
+        value: null,
+        issues,
+      });
+    });
+
+    test('for empty string', () => {
+      expectNoActionIssue(action, ['']);
+    });
+
+    test('for Base64url strings', () => {
+      expectNoActionIssue(action, [
+        // ---- Necessary valid test vectors from https://datatracker.ietf.org/doc/html/rfc4648#section-10 ----
+        // 'f'
+        'Zg==',
+        'Zg',
+        // 'fo'
+        'Zm8=',
+        'Zm8',
+        // 'foo'
+        'Zm9v',
+        // 'foob'
+        'Zm9vYg==',
+        'Zm9vYg',
+        // 'fooba'
+        'Zm9vYmE=',
+        'Zm9vYmE',
+        // 'foobar'
+        'Zm9vYmFy',
+        // ---- Other custom tests ----
+        // ÿÿÿy
+        'w7_Dv8O_eQ==',
+        'w7_Dv8O_eQ',
+        // ~test~123v
+        'fnRlc3R-MTIzdg==',
+        'fnRlc3R-MTIzdg',
+        // valibot
+        'dmFsaWJvdA==',
+        'dmFsaWJvdA',
+        // 🌮
+        '8J-Mrg==',
+        '8J-Mrg',
+        // 1234567890
+        'MTIzNDU2Nzg5MA==',
+        'MTIzNDU2Nzg5MA',
+        // ~`!@#$%^&*()_-+={[}]\|;:"',<.>/?
+        'fmAhQCMkJV4mKigpXy0rPXtbfV1cfDs6IicsPC4-Lz8=',
+        'fmAhQCMkJV4mKigpXy0rPXtbfV1cfDs6IicsPC4-Lz8',
+        // Hello, I am Valibot and I would like to help you validate data easily using a schema.
+        'SGVsbG8sIEkgYW0gVmFsaWJvdCBhbmQgSSB3b3VsZCBsaWtlIHRvIGhlbHAgeW91IHZhbGlkYXRlIGRhdGEgZWFzaWx5IHVzaW5nIGEgc2NoZW1hLg==',
+        'SGVsbG8sIEkgYW0gVmFsaWJvdCBhbmQgSSB3b3VsZCBsaWtlIHRvIGhlbHAgeW91IHZhbGlkYXRlIGRhdGEgZWFzaWx5IHVzaW5nIGEgc2NoZW1hLg',
+      ]);
+    });
+  });
+
+  describe('should return dataset with issues', () => {
+    const action = base64Url('message');
+    const baseIssue: Omit<Base64UrlIssue<string>, 'input' | 'received'> = {
+      kind: 'validation',
+      type: 'base64_url',
+      expected: null,
+      message: 'message',
+      requirement: BASE64_URL_REGEX,
+    };
+
+    test('for blank strings', () => {
+      expectActionIssue(action, baseIssue, [' ', '\n']);
+    });
+
+    test('for invalid chars', () => {
+      expectActionIssue(action, baseIssue, [
+        'foo`', // `
+        'foo~', // ~
+        'foo!', // !
+        'foo@', // @
+        'foo#', // #
+        'foo$', // $
+        'foo%', // %
+        'foo^', // ^
+        'foo&', // &
+        'foo*', // *
+        'foo(', // (
+        'foo)', // )
+        'foo+', // +
+        'foo[', // [
+        'foo]', // ]
+        'foo{', // {
+        'foo}', // }
+        'foo\\', // \
+        'foo|', // |
+        'foo;', // ;
+        'foo:', // :
+        "foo'", // '
+        'foo"', // "
+        'foo,', // ,
+        'foo.', // .
+        'foo<', // <
+        'foo>', // >
+        'foo?', // ?
+        'foo/', // /
+      ]);
+    });
+
+    test('for invalid padding', () => {
+      expectActionIssue(action, baseIssue, [
+        'dmFsaWJvdA=', // = missing
+        'dmFsaWJvdA===', // = extra
+        'Zm9vYmE==', // = extra
+      ]);
+    });
+
+    test('for invalid length or character position', () => {
+      expectActionIssue(action, baseIssue, [
+        '12345', // contains 5 characters
+        'a==A', // `=` is used in between the characters
+      ]);
+    });
+  });
+});
diff --git a/library/src/actions/base64Url/base64Url.ts b/library/src/actions/base64Url/base64Url.ts
new file mode 100644
index 000000000..b9e1aa924
--- /dev/null
+++ b/library/src/actions/base64Url/base64Url.ts
@@ -0,0 +1,106 @@
+import { BASE64_URL_REGEX } from '../../regex.ts';
+import type {
+  BaseIssue,
+  BaseValidation,
+  ErrorMessage,
+} from '../../types/index.ts';
+import { _addIssue } from '../../utils/index.ts';
+
+/**
+ * Base64Url issue interface.
+ */
+export interface Base64UrlIssue<TInput extends string>
+  extends BaseIssue<TInput> {
+  /**
+   * The issue kind.
+   */
+  readonly kind: 'validation';
+  /**
+   * The issue type.
+   */
+  readonly type: 'base64_url';
+  /**
+   * The expected property.
+   */
+  readonly expected: null;
+  /**
+   * The received property.
+   */
+  readonly received: `"${string}"`;
+  /**
+   * The base64 url regex.
+   */
+  readonly requirement: RegExp;
+}
+
+/**
+ * Base64Url action interface.
+ */
+export interface Base64UrlAction<
+  TInput extends string,
+  TMessage extends ErrorMessage<Base64UrlIssue<TInput>> | undefined,
+> extends BaseValidation<TInput, TInput, Base64UrlIssue<TInput>> {
+  /**
+   * The action type.
+   */
+  readonly type: 'base64_url';
+  /**
+   * The action reference.
+   */
+  readonly reference: typeof base64Url;
+  /**
+   * The expected property.
+   */
+  readonly expects: null;
+  /**
+   * The base64 url regex.
+   */
+  readonly requirement: RegExp;
+  /**
+   * The error message.
+   */
+  readonly message: TMessage;
+}
+
+/**
+ * Creates a [base64 url](https://en.wikipedia.org/wiki/Base64#URL_applications) validation action.
+ *
+ * @returns A base64 url action.
+ */
+export function base64Url<TInput extends string>(): Base64UrlAction<
+  TInput,
+  undefined
+>;
+
+/**
+ * Creates a [base64 url](https://en.wikipedia.org/wiki/Base64#URL_applications) validation action.
+ *
+ * @param message The error message.
+ *
+ * @returns A base64 url action.
+ */
+export function base64Url<
+  TInput extends string,
+  const TMessage extends ErrorMessage<Base64UrlIssue<TInput>> | undefined,
+>(message: TMessage): Base64UrlAction<TInput, TMessage>;
+
+// @__NO_SIDE_EFFECTS__
+export function base64Url(
+  message?: ErrorMessage<Base64UrlIssue<string>>
+): Base64UrlAction<string, ErrorMessage<Base64UrlIssue<string>> | undefined> {
+  return {
+    kind: 'validation',
+    type: 'base64_url',
+    reference: base64Url,
+    async: false,
+    expects: null,
+    requirement: BASE64_URL_REGEX,
+    message,
+    '~run'(dataset, config) {
+      if (dataset.typed && !this.requirement.test(dataset.value)) {
+        _addIssue(this, 'Base64Url', dataset, config);
+      }
+      return dataset;
+    },
+  };
+}
diff --git a/library/src/actions/base64Url/index.ts b/library/src/actions/base64Url/index.ts
new file mode 100644
index 000000000..3dc880965
--- /dev/null
+++ b/library/src/actions/base64Url/index.ts
@@ -0,0 +1 @@
+export * from './base64Url.ts';
diff --git a/library/src/actions/index.ts b/library/src/actions/index.ts
index 095dd721e..a515a4643 100644
--- a/library/src/actions/index.ts
+++ b/library/src/actions/index.ts
@@ -1,6 +1,7 @@
 export * from './args/index.ts';
 export * from './await/index.ts';
 export * from './base64/index.ts';
+export * from './base64Url/index.ts';
 export * from './bic/index.ts';
 export * from './brand/index.ts';
 export * from './bytes/index.ts';
diff --git a/library/src/regex.ts b/library/src/regex.ts
index 3e161e9cd..ea97fa7ab 100644
--- a/library/src/regex.ts
+++ b/library/src/regex.ts
@@ -4,6 +4,12 @@
 export const BASE64_REGEX: RegExp =
   /^(?:[\da-z+/]{4})*(?:[\da-z+/]{2}==|[\da-z+/]{3}=)?$/iu;
 
+/**
+ * [Base64url](https://datatracker.ietf.org/doc/html/rfc4648#section-5) regex.
+ */
+export const BASE64_URL_REGEX: RegExp =
+  /^(?:[\w-]{4})*(?:[\w-]{2}(?:==)?|[\w-]{3}=?)?$/iu;
+
 /**
  * [BIC](https://en.wikipedia.org/wiki/ISO_9362) regex.
  */
diff --git a/website/src/routes/api/(actions)/base64Url/index.mdx b/website/src/routes/api/(actions)/base64Url/index.mdx
new file mode 100644
index 000000000..7af232865
--- /dev/null
+++ b/website/src/routes/api/(actions)/base64Url/index.mdx
@@ -0,0 +1,66 @@
+---
+title: base64Url
+description: Creates a base64 url validation action.
+source: /actions/base64Url/base64Url.ts
+contributors:
+  - EltonLobo07
+---
+
+import { ApiList, Property } from '~/components';
+import { properties } from './properties';
+
+# base64Url
+
+Creates a [base64 url](https://en.wikipedia.org/wiki/Base64#URL_applications) validation action.
+
+```ts
+const Action = v.base64Url<TInput, TMessage>(message);
+```
+
+## Generics
+
+- `TInput` <Property {...properties.TInput} />
+- `TMessage` <Property {...properties.TMessage} />
+
+## Parameters
+
+- `message` <Property {...properties.message} />
+
+### Explanation
+
+With `base64Url` you can validate the formatting of a string. If the input is not a base64 url string, you can use `message` to customize the error message.
+
+## Returns
+
+- `Action` <Property {...properties.Action} />
+
+## Examples
+
+The following examples show how `base64Url` can be used.
+
+### Base64Url schema
+
+Schema to validate a base64 url string.
+
+```ts
+const Base64UrlSchema = v.pipe(
+  v.string(),
+  v.base64Url('The data is badly encoded.')
+);
+```
+
+## Related
+
+The following APIs can be combined with `base64Url`.
+
+### Schemas
+
+<ApiList items={['any', 'custom', 'string', 'unknown']} />
+
+### Methods
+
+<ApiList items={['pipe']} />
+
+### Utils
+
+<ApiList items={['isOfKind', 'isOfType']} />
diff --git a/website/src/routes/api/(actions)/base64Url/properties.ts b/website/src/routes/api/(actions)/base64Url/properties.ts
new file mode 100644
index 000000000..05fc18bfb
--- /dev/null
+++ b/website/src/routes/api/(actions)/base64Url/properties.ts
@@ -0,0 +1,58 @@
+import type { PropertyProps } from '~/components';
+
+export const properties: Record<string, PropertyProps> = {
+  TInput: {
+    modifier: 'extends',
+    type: 'string',
+  },
+  TMessage: {
+    modifier: 'extends',
+    type: {
+      type: 'union',
+      options: [
+        {
+          type: 'custom',
+          name: 'ErrorMessage',
+          href: '../ErrorMessage/',
+          generics: [
+            {
+              type: 'custom',
+              name: 'Base64UrlIssue',
+              href: '../Base64UrlIssue/',
+              generics: [
+                {
+                  type: 'custom',
+                  name: 'TInput',
+                },
+              ],
+            },
+          ],
+        },
+        'undefined',
+      ],
+    },
+  },
+  message: {
+    type: {
+      type: 'custom',
+      name: 'TMessage',
+    },
+  },
+  Action: {
+    type: {
+      type: 'custom',
+      name: 'Base64UrlAction',
+      href: '../Base64UrlAction/',
+      generics: [
+        {
+          type: 'custom',
+          name: 'TInput',
+        },
+        {
+          type: 'custom',
+          name: 'TMessage',
+        },
+      ],
+    },
+  },
+};
diff --git a/website/src/routes/api/(types)/Base64UrlAction/index.mdx b/website/src/routes/api/(types)/Base64UrlAction/index.mdx
new file mode 100644
index 000000000..9fb52f253
--- /dev/null
+++ b/website/src/routes/api/(types)/Base64UrlAction/index.mdx
@@ -0,0 +1,27 @@
+---
+title: Base64UrlAction
+description: Base64Url action interface.
+contributors:
+  - EltonLobo07
+---
+
+import { Property } from '~/components';
+import { properties } from './properties';
+
+# Base64UrlAction
+
+Base64Url action interface.
+
+## Generics
+
+- `TInput` <Property {...properties.TInput} />
+- `TMessage` <Property {...properties.TMessage} />
+
+## Definition
+
+- `Base64UrlAction` <Property {...properties.BaseValidation} />
+  - `type` <Property {...properties.type} />
+  - `reference` <Property {...properties.reference} />
+  - `expects` <Property {...properties.expects} />
+  - `requirement` <Property {...properties.requirement} />
+  - `message` <Property {...properties.message} />
diff --git a/website/src/routes/api/(types)/Base64UrlAction/properties.ts b/website/src/routes/api/(types)/Base64UrlAction/properties.ts
new file mode 100644
index 000000000..0d52f7f58
--- /dev/null
+++ b/website/src/routes/api/(types)/Base64UrlAction/properties.ts
@@ -0,0 +1,93 @@
+import type { PropertyProps } from '~/components';
+
+export const properties: Record<string, PropertyProps> = {
+  TInput: {
+    modifier: 'extends',
+    type: 'string',
+  },
+  TMessage: {
+    modifier: 'extends',
+    type: {
+      type: 'union',
+      options: [
+        {
+          type: 'custom',
+          name: 'ErrorMessage',
+          href: '../ErrorMessage/',
+          generics: [
+            {
+              type: 'custom',
+              name: 'Base64UrlIssue',
+              href: '../Base64UrlIssue/',
+              generics: [
+                {
+                  type: 'custom',
+                  name: 'TInput',
+                },
+              ],
+            },
+          ],
+        },
+        'undefined',
+      ],
+    },
+  },
+  BaseValidation: {
+    modifier: 'extends',
+    type: {
+      type: 'custom',
+      name: 'BaseValidation',
+      href: '../BaseValidation/',
+      generics: [
+        {
+          type: 'custom',
+          name: 'TInput',
+        },
+        {
+          type: 'custom',
+          name: 'TInput',
+        },
+        {
+          type: 'custom',
+          name: 'Base64UrlIssue',
+          href: '../Base64UrlIssue/',
+          generics: [
+            {
+              type: 'custom',
+              name: 'TInput',
+            },
+          ],
+        },
+      ],
+    },
+  },
+  type: {
+    type: {
+      type: 'string',
+      value: 'base64_url',
+    },
+  },
+  reference: {
+    type: {
+      type: 'custom',
+      modifier: 'typeof',
+      name: 'base64Url',
+      href: '../base64Url/',
+    },
+  },
+  expects: {
+    type: 'null',
+  },
+  requirement: {
+    type: {
+      type: 'custom',
+      name: 'RegExp',
+    },
+  },
+  message: {
+    type: {
+      type: 'custom',
+      name: 'TMessage',
+    },
+  },
+};
diff --git a/website/src/routes/api/(types)/Base64UrlIssue/index.mdx b/website/src/routes/api/(types)/Base64UrlIssue/index.mdx
new file mode 100644
index 000000000..55afe840e
--- /dev/null
+++ b/website/src/routes/api/(types)/Base64UrlIssue/index.mdx
@@ -0,0 +1,26 @@
+---
+title: Base64UrlIssue
+description: Base64Url issue interface.
+contributors:
+  - EltonLobo07
+---
+
+import { Property } from '~/components';
+import { properties } from './properties';
+
+# Base64UrlIssue
+
+Base64Url issue interface.
+
+## Generics
+
+- `TInput` <Property {...properties.TInput} />
+
+## Definition
+
+- `Base64UrlIssue` <Property {...properties.BaseIssue} />
+  - `kind` <Property {...properties.kind} />
+  - `type` <Property {...properties.type} />
+  - `expected` <Property {...properties.expected} />
+  - `received` <Property {...properties.received} />
+  - `requirement` <Property {...properties.requirement} />
diff --git a/website/src/routes/api/(types)/Base64UrlIssue/properties.ts b/website/src/routes/api/(types)/Base64UrlIssue/properties.ts
new file mode 100644
index 000000000..2e6be084a
--- /dev/null
+++ b/website/src/routes/api/(types)/Base64UrlIssue/properties.ts
@@ -0,0 +1,59 @@
+import type { PropertyProps } from '~/components';
+
+export const properties: Record<string, PropertyProps> = {
+  TInput: {
+    modifier: 'extends',
+    type: 'string',
+  },
+  BaseIssue: {
+    modifier: 'extends',
+    type: {
+      type: 'custom',
+      name: 'BaseIssue',
+      href: '../BaseIssue/',
+      generics: [
+        {
+          type: 'custom',
+          name: 'TInput',
+        },
+      ],
+    },
+  },
+  kind: {
+    type: {
+      type: 'string',
+      value: 'validation',
+    },
+  },
+  type: {
+    type: {
+      type: 'string',
+      value: 'base64_url',
+    },
+  },
+  expected: {
+    type: 'null',
+  },
+  received: {
+    type: {
+      type: 'template',
+      parts: [
+        {
+          type: 'string',
+          value: '"',
+        },
+        'string',
+        {
+          type: 'string',
+          value: '"',
+        },
+      ],
+    },
+  },
+  requirement: {
+    type: {
+      type: 'custom',
+      name: 'RegExp',
+    },
+  },
+};
diff --git a/website/src/routes/api/menu.md b/website/src/routes/api/menu.md
index fa8096268..30b4c961e 100644
--- a/website/src/routes/api/menu.md
+++ b/website/src/routes/api/menu.md
@@ -77,6 +77,7 @@
 
 - [args](/api/args/)
 - [base64](/api/base64/)
+- [base64Url](/api/base64Url/)
 - [bic](/api/bic/)
 - [brand](/api/brand/)
 - [bytes](/api/bytes/)
@@ -258,6 +259,8 @@
 - [AwaitActionAsync](/api/AwaitActionAsync/)
 - [Base64Action](/api/Base64Action/)
 - [Base64Issue](/api/Base64Issue/)
+- [Base64UrlAction](/api/Base64UrlAction/)
+- [Base64UrlIssue](/api/Base64UrlIssue/)
 - [BaseIssue](/api/BaseIssue/)
 - [BaseMetadata](/api/BaseMetadata/)
 - [BaseSchema](/api/BaseSchema/)