diff --git a/.changeset/bright-adults-battle.md b/.changeset/bright-adults-battle.md
new file mode 100644
index 0000000..adeadd7
--- /dev/null
+++ b/.changeset/bright-adults-battle.md
@@ -0,0 +1,5 @@
+---
+"@obosbbl/format": minor
+---
+
+initial release
diff --git a/packages/format/README.md b/packages/format/README.md
new file mode 100644
index 0000000..05d87b2
--- /dev/null
+++ b/packages/format/README.md
@@ -0,0 +1,39 @@
+# @obosbbl/format
+
+[![NPM Version](https://img.shields.io/npm/v/%40obosbbl%2Fformat)](https://www.npmjs.com/package/@obosbbl/format)
+
+
+A collection of formatting functions for both 🇳🇴 and 🇸🇪 with zero dependencies.
+
+## Install
+
+```sh
+# npm
+npm install @obosbbl/format
+
+# pnpm
+pnpm add @obosbbl/format
+```
+
+## Usage
+
+The package has two entrypoints, one for `no` and one for `se`. That allows you to import for only the locale you need.
+
+Note that the methods are very lenient when attempting to format the input. It will strip all characters that aren't digits or letters before it applies the formatting.
+That way any existing format of the input won't affect the formatted output
+
+If unable to format the input, the method will return the (cleaned) input as is.
+
+```js
+// 🇳🇴 example
+import { formatOrganizationNumber } from '@obosbbl/format/no';
+formatOrganizationNumber('000000000') // => '000 000 000'
+
+// 🇸🇪 example
+import { formatOrganizationNumber } from '@obosbbl/format/se';
+formatOrganizationNumber('0000000000') // => '000000-0000'
+```
+
+## Methods
+
+* formatOrganizationNumber
diff --git a/packages/format/package.json b/packages/format/package.json
new file mode 100644
index 0000000..2b8057a
--- /dev/null
+++ b/packages/format/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "@obosbbl/format",
+  "version": "0.0.0",
+  "description": "A collection of formatting methods for OBOS",
+  "repository": {
+    "url": "https://github.com/code-obos/public-frontend-modules"
+  },
+  "license": "MIT",
+  "sideEffects": false,
+  "type": "module",
+  "exports": {
+    "./no": {
+      "types": "./dist/no.d.mts",
+      "default": "./dist/no.mjs"
+    },
+    "./se": {
+      "types": "./dist/se.d.mts",
+      "default": "./dist/se.mjs"
+    }
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "bunchee"
+  },
+  "dependencies": {}
+}
diff --git a/packages/format/src/format.test.ts b/packages/format/src/format.test.ts
new file mode 100644
index 0000000..919cbd9
--- /dev/null
+++ b/packages/format/src/format.test.ts
@@ -0,0 +1,27 @@
+import { describe, expect, test } from 'vitest';
+import { formatOrganizationNumber as formatOrganizationNumberNo } from './no';
+import { formatOrganizationNumber as formatOrganizationNumberSe } from './se';
+
+describe('no', () => {
+  test.each([
+    ['000000000', '000 000 000'],
+    ['000 000 000', '000 000 000'],
+    ['000-000-000', '000 000 000'],
+    ['abc', 'abc'],
+  ])('formatOrganizationNumber(%s) -> %s', (input, expected) => {
+    expect(formatOrganizationNumberNo(input)).toBe(expected);
+  });
+});
+
+describe('se', () => {
+  test.each([
+    ['0000000000', '000000-0000'],
+    ['000000-0000', '000000-0000'],
+    ['000000 0000', '000000-0000'],
+    [' 000000 0000 ', '000000-0000'],
+    ['000', '000'],
+    ['abc', 'abc'],
+  ])('formatOrganizationNumber(%s) -> %s', (input, expected) => {
+    expect(formatOrganizationNumberSe(input)).toBe(expected);
+  });
+});
diff --git a/packages/format/src/no.ts b/packages/format/src/no.ts
new file mode 100644
index 0000000..c2e823f
--- /dev/null
+++ b/packages/format/src/no.ts
@@ -0,0 +1,14 @@
+import { replaceIfMatch } from './utils';
+
+const ORG_NUMBER_FORMAT = /^(\d{3})(\d{3})(\d{3})$/;
+
+/**
+ * Format an organization number
+ * @example
+ * ```
+ * formatOrganizationNumber('000000000') // => '000 000 000'
+ * ```
+ */
+export function formatOrganizationNumber(input: string): string {
+  return replaceIfMatch(input, ORG_NUMBER_FORMAT, '$1 $2 $3');
+}
diff --git a/packages/format/src/se.ts b/packages/format/src/se.ts
new file mode 100644
index 0000000..363ce12
--- /dev/null
+++ b/packages/format/src/se.ts
@@ -0,0 +1,14 @@
+import { replaceIfMatch } from './utils';
+
+const ORG_NUMBER_FORMAT = /^(\d{6})(\d{4})$/;
+
+/**
+ * Format an organization number
+ * @example
+ * ```
+ * formatOrganizationNumber('0000000000') // => '000000-0000'
+ * ```
+ */
+export function formatOrganizationNumber(input: string): string {
+  return replaceIfMatch(input, ORG_NUMBER_FORMAT, '$1-$2');
+}
diff --git a/packages/format/src/utils.ts b/packages/format/src/utils.ts
new file mode 100644
index 0000000..80e96ee
--- /dev/null
+++ b/packages/format/src/utils.ts
@@ -0,0 +1,12 @@
+export function replaceIfMatch(
+  input: string,
+  regex: RegExp,
+  replacerPattern: string,
+): string {
+  // We're extremely lenient when attemtping to format the input.
+  // We remove everything that isn't a letter or a number, that way we can get rid of any
+  // formatting that might already be present in the input, eg spaces, hyphens or dots
+  const cleaned = input.replace(/[^a-zA-Z0-9]/g, '');
+
+  return cleaned.replace(regex, replacerPattern);
+}
diff --git a/packages/format/tsconfig.json b/packages/format/tsconfig.json
new file mode 100644
index 0000000..dcbf63f
--- /dev/null
+++ b/packages/format/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["./src/*"],
+  "compilerOptions": {
+    "outDir": "dist"
+  }
+}