diff --git a/dist/index.js b/dist/index.js
index af42dfd..1e34b50 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -195,6 +195,10 @@
     return `${xyz}${s}`.toUpperCase();
   };
 
+  const normalize = str => {
+    return str.replace(/[-_\s]/gi, '');
+  };
+
   exports.isValid = isValid;
   exports.isNIE = isNIE;
   exports.isNIF = isNIF;
@@ -203,6 +207,7 @@
   exports.ctrlChar = ctrlChar;
   exports.randomNIFWith = randomNIFWith;
   exports.randomNIEWith = randomNIEWith;
+  exports.normalize = normalize;
 
   Object.defineProperty(exports, '__esModule', { value: true });
 
diff --git a/dist/index.js.map b/dist/index.js.map
index 018a2b3..c87720d 100644
--- a/dist/index.js.map
+++ b/dist/index.js.map
@@ -1 +1 @@
-{"version":3,"file":"index.js","sources":["../src/internal/_isNIE.js","../src/internal/_isNIF.js","../src/isValid.js","../src/internal/_utils.js","../src/ctrlChar.js","../src/isNIE.js","../src/isNIF.js","../src/randomNIF.js","../src/randomNIE.js","../src/randomNIFWith.js","../src/randomNIEWith.js"],"sourcesContent":["export const _isNIE = v => /^[XYZ]{1}[0-9]{7}[TRWAGMYFPDXBNJZSQVHLCKE]{1}$/i.test(v);\n","export const _isNIF = v => /^[0-9]{8}[TRWAGMYFPDXBNJZSQVHLCKE]{1}$/i.test(v);\n","import { _isNIE } from './internal/_isNIE';\nimport { _isNIF } from './internal/_isNIF';\n\n/**\n * Returns true if the string is a valid DNI (NIF or NIE)\n * @param {string} value\n * @returns {boolean}\n * @since 1.1.0\n * @example\n * isValid(\"X9464186P\"); // => true\n * isValid(\"03118880B\"); // => true\n */\nconst isValid = value => {\n  const dni = !value ? '' : value; // lowercase is faster\n\n  if (dni.length !== 9 && !_isNIE(dni) && !_isNIF(dni)) return false;\n\n  let f = 'xyzXYZ'.indexOf(dni[0]) % 3;\n  if (f === -1) f = dni[0];\n  const i = +(f + dni.slice(1, 8)) % 23;\n\n  return 'trwagmyfpdxbnjzsqvhlcket'.indexOf(dni[8].toLowerCase()) === i;\n};\n\nexport { isValid };\n","function _Random(seed) {\n  this._seed = seed % 2147483647;\n  if (this._seed <= 0) this._seed += 2147483646;\n}\n\n_Random.prototype.next = function() {\n  return (this._seed = (this._seed * 16807) % 2147483647);\n};\n\n// _Random :: https://gist.github.com/blixt/f17b47c62508be59987b#file-prng-js\n\nconst _letter = x => 'trwagmyfpdxbnjzsqvhlcke'[+x % 23];\nconst _randStrLimit = limit => `${Math.random()}`.slice(-limit);\nconst _randFloat = seed => (new _Random(seed).next() - 1) / 2147483646;\n\nexport { _letter, _randStrLimit, _randFloat };\n","import { _letter } from './internal/_utils';\n\n/**\n * Returns the control letter in upper case\n * for a NIF or NIE with or without control letter\n * @param {string} value\n * @returns {string}\n * @since 1.9.1\n * @example\n * ctrlChar(\"X9464186P\"); // => 'P'\n * ctrlChar(\"X9464186\"); // => 'P'\n * ctrlChar(\"03118880B\"); // => 'B'\n * ctrlChar(\"03118880\"); // => 'B'\n */\nconst ctrlChar = y => {\n  // Get a number from 0 - 2 when `y` is a NIE\n  let f = 'xyzXYZ'.indexOf(y[0]) % 3;\n  // Otherwise default to the number (NIF case only)\n  if (f === -1) f = y[0];\n  // Strip the letters\n  const i = `${f}${y.slice(1, 8)}`;\n  return _letter(i).toUpperCase();\n};\n\nexport { ctrlChar };\n","import { _isNIE } from './internal/_isNIE';\nimport { ctrlChar } from './ctrlChar';\n\n/**\n * Returns true if the string is a NIE\n * @param {string} value\n * @returns {boolean}\n * @since 1.0.1\n * @example\n * isNIE(\"X4108613P\"); // => true\n */\nconst isNIE = value => {\n  return (\n    !!value && value.length === 9 && _isNIE(value) && ctrlChar(value) === value[8].toUpperCase()\n  );\n};\n\nexport { isNIE };\n","import { _isNIF } from './internal/_isNIF';\nimport { ctrlChar } from './ctrlChar';\n\n/**\n * Returns true if the string is a NIF\n * @param {string} value\n * @returns {boolean}\n * @since 1.0.1\n * @example\n * isNIF(\"93375221M\"); // => true\n */\nconst isNIF = value => {\n  return (\n    !!value && value.length === 9 && _isNIF(value) && ctrlChar(value) === value[8].toUpperCase()\n  );\n};\n\nexport { isNIF };\n","import { _randStrLimit, _letter } from './internal/_utils';\n\n/**\n * Returns a valid NIF string\n * @returns {string}\n * @since 1.8.1\n * @example\n * randomNIF() // => \"93375221M\"\n */\nconst randomNIF = () => {\n  const nn = _randStrLimit(8);\n  return nn + _letter(nn).toUpperCase();\n};\n\nexport { randomNIF };\n","import { _randStrLimit, _letter } from './internal/_utils';\n\n/**\n * Returns a valid NIE string\n * @returns {string}\n * @since 1.8.1\n * @example\n * randomNIE() // => \"X4108613P\"\n */\nconst randomNIE = () => {\n  const r = Math.floor(Math.random() * 3);\n  const nn = _randStrLimit(7);\n  const l = _letter(+`${r}${nn}`).toUpperCase();\n  return `${'XYZ'[r]}${nn}${l}`;\n};\n\nexport { randomNIE };\n","import { _randFloat } from './internal/_utils';\n\n/**\n * Returns a random NIF with a specific letter\n * A seed can be passed as a second parameter and\n * it will always return the same value\n * @returns {string | null}\n * @since 1.11.0\n * @example\n * with random seed\n * randomNIFWith('C'); //=> '95652190C'\n * randomNIFWith('G'); //=> '60869550G'\n *\n * with the same seed\n * randomNIFWith('G', 1); //=> '95652174G'\n * randomNIFWith('G', 1); //=> '95652174G'\n */\nconst randomNIFWith = (char, seed = 100000000 * Math.random()) => {\n  const lastNum = 'trwagmyfpdxbnjzsqvhlckeTRWAGMYFPDXBNJZSQVHLCKE'.indexOf(char) % 23;\n\n  if (lastNum === -1) return null;\n\n  // TODO: Better calculation\n  const n = 99999998 - 4347826 * (Math.floor(_randFloat(seed) * 22) + 1);\n\n  const d = Math.max(0, n) % 23;\n  const h = n + (lastNum - d);\n  const s = `0${h}`.slice(-8);\n\n  return `${s}${char}`.toUpperCase();\n};\n\nexport { randomNIFWith };\n","import { _randFloat } from './internal/_utils';\nimport { ctrlChar } from './ctrlChar';\n\n/**\n * Returns a random NIE with a specific letter\n * A seed can be passed as a third parameter and\n * it will always return the same value\n * @param head {string}\n * @param char {string}\n * @returns {string | null}\n * @since 1.12.0\n * @example\n * with random seed\n * randomNIEWith('Y', 'C'); //=> 'Y2098020C'\n * randomNIEWith('Z', 'G'); //=> 'Z5670557G'\n *\n * with the same seed\n * randomNIEWith('X', 'E', 1); //=> 'X2080280E'\n * randomNIEWith('X', 'E', 1); //=> 'X2080280E'\n */\nconst randomNIEWith = (xyz, l, seed = 100000000 * Math.random()) => {\n  const headNum = 'xyzXYZ'.indexOf(xyz) % 3;\n\n  if (headNum === -1) return null;\n\n  const lastNum = 'trwagmyfpdxbnjzsqvhlckeTRWAGMYFPDXBNJZSQVHLCKE'.indexOf(l) % 23;\n\n  if (lastNum === -1) return null;\n\n  const headOne = headNum + 1;\n\n  // TODO: Better calculation\n  const num = Math.floor(1000000 * headOne + (9999999 - 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'' : value; // lowercase is faster\n\n  if (dni.length !== 9 && !_isNIE(dni) && !_isNIF(dni)) return false;\n\n  let f = 'xyzXYZ'.indexOf(dni[0]) % 3;\n  if (f === -1) f = dni[0];\n  const i = +(f + dni.slice(1, 8)) % 23;\n\n  return 'trwagmyfpdxbnjzsqvhlcket'.indexOf(dni[8].toLowerCase()) === i;\n};\n\nexport { isValid };\n","function _Random(seed) {\n  this._seed = seed % 2147483647;\n  if (this._seed <= 0) this._seed += 2147483646;\n}\n\n_Random.prototype.next = function() {\n  return (this._seed = (this._seed * 16807) % 2147483647);\n};\n\n// _Random :: https://gist.github.com/blixt/f17b47c62508be59987b#file-prng-js\n\nconst _letter = x => 'trwagmyfpdxbnjzsqvhlcke'[+x % 23];\nconst _randStrLimit = limit => `${Math.random()}`.slice(-limit);\nconst _randFloat = seed => (new _Random(seed).next() - 1) / 2147483646;\n\nexport { _letter, _randStrLimit, _randFloat };\n","import { _letter } from './internal/_utils';\n\n/**\n * Returns the control letter in upper case\n * for a NIF or NIE with or without control letter\n * @param {string} value\n * @returns {string}\n * @since 1.9.1\n * @example\n * ctrlChar(\"X9464186P\"); // => 'P'\n * ctrlChar(\"X9464186\"); // => 'P'\n * ctrlChar(\"03118880B\"); // => 'B'\n * ctrlChar(\"03118880\"); // => 'B'\n */\nconst ctrlChar = y => {\n  // Get a number from 0 - 2 when `y` is a NIE\n  let f = 'xyzXYZ'.indexOf(y[0]) % 3;\n  // Otherwise default to the number (NIF case only)\n  if (f === -1) f = y[0];\n  // Strip the letters\n  const i = `${f}${y.slice(1, 8)}`;\n  return _letter(i).toUpperCase();\n};\n\nexport { ctrlChar };\n","import { _isNIE } from './internal/_isNIE';\nimport { ctrlChar } from './ctrlChar';\n\n/**\n * Returns true if the string is a NIE\n * @param {string} value\n * @returns {boolean}\n * @since 1.0.1\n * @example\n * isNIE(\"X4108613P\"); // => true\n */\nconst isNIE = value => {\n  return (\n    !!value && value.length === 9 && _isNIE(value) && ctrlChar(value) === value[8].toUpperCase()\n  );\n};\n\nexport { isNIE };\n","import { _isNIF } from './internal/_isNIF';\nimport { ctrlChar } from './ctrlChar';\n\n/**\n * Returns true if the string is a NIF\n * @param {string} value\n * @returns {boolean}\n * @since 1.0.1\n * @example\n * isNIF(\"93375221M\"); // => true\n */\nconst isNIF = value => {\n  return (\n    !!value && value.length === 9 && _isNIF(value) && ctrlChar(value) === value[8].toUpperCase()\n  );\n};\n\nexport { isNIF };\n","import { _randStrLimit, _letter } from './internal/_utils';\n\n/**\n * Returns a valid NIF string\n * @returns {string}\n * @since 1.8.1\n * @example\n * randomNIF() // => \"93375221M\"\n */\nconst randomNIF = () => {\n  const nn = _randStrLimit(8);\n  return nn + _letter(nn).toUpperCase();\n};\n\nexport { randomNIF };\n","import { _randStrLimit, _letter } from './internal/_utils';\n\n/**\n * Returns a valid NIE string\n * @returns {string}\n * @since 1.8.1\n * @example\n * randomNIE() // => \"X4108613P\"\n */\nconst randomNIE = () => {\n  const r = Math.floor(Math.random() * 3);\n  const nn = _randStrLimit(7);\n  const l = _letter(+`${r}${nn}`).toUpperCase();\n  return `${'XYZ'[r]}${nn}${l}`;\n};\n\nexport { randomNIE };\n","import { _randFloat } from './internal/_utils';\n\n/**\n * Returns a random NIF with a specific letter\n * A seed can be passed as a second parameter and\n * it will always return the same value\n * @returns {string | null}\n * @since 1.11.0\n * @example\n * with random seed\n * randomNIFWith('C'); //=> '95652190C'\n * randomNIFWith('G'); //=> '60869550G'\n *\n * with the same seed\n * randomNIFWith('G', 1); //=> '95652174G'\n * randomNIFWith('G', 1); //=> '95652174G'\n */\nconst randomNIFWith = (char, seed = 100000000 * Math.random()) => {\n  const lastNum = 'trwagmyfpdxbnjzsqvhlckeTRWAGMYFPDXBNJZSQVHLCKE'.indexOf(char) % 23;\n\n  if (lastNum === -1) return null;\n\n  // TODO: Better calculation\n  const n = 99999998 - 4347826 * (Math.floor(_randFloat(seed) * 22) + 1);\n\n  const d = Math.max(0, n) % 23;\n  const h = n + (lastNum - d);\n  const s = `0${h}`.slice(-8);\n\n  return `${s}${char}`.toUpperCase();\n};\n\nexport { randomNIFWith };\n","import { _randFloat } from './internal/_utils';\nimport { ctrlChar } from './ctrlChar';\n\n/**\n * Returns a random NIE with a specific letter\n * A seed can be passed as a third parameter and\n * it will always return the same value\n * @param head {string}\n * @param char {string}\n * @returns {string | null}\n * @since 1.12.0\n * @example\n * with random seed\n * randomNIEWith('Y', 'C'); //=> 'Y2098020C'\n * randomNIEWith('Z', 'G'); //=> 'Z5670557G'\n *\n * with the same seed\n * randomNIEWith('X', 'E', 1); //=> 'X2080280E'\n * randomNIEWith('X', 'E', 1); //=> 'X2080280E'\n */\nconst randomNIEWith = (xyz, l, seed = 100000000 * Math.random()) => {\n  const headNum = 'xyzXYZ'.indexOf(xyz) % 3;\n\n  if (headNum === -1) return null;\n\n  const lastNum = 'trwagmyfpdxbnjzsqvhlckeTRWAGMYFPDXBNJZSQVHLCKE'.indexOf(l) % 23;\n\n  if (lastNum === -1) return null;\n\n  const headOne = headNum + 1;\n\n  // TODO: Better calculation\n  const num = Math.floor(1000000 * headOne + (9999999 - 1000000 * headOne - 23) * _randFloat(seed));\n\n  const b = +`${headNum}${num}`;\n  const rest = b % 23;\n  const h = b - rest + lastNum;\n\n  const s = `0${h}${l}`.slice(-8);\n\n  return `${xyz}${s}`.toUpperCase();\n};\n\nexport { randomNIEWith };\n","export const normalize = str => {\n  return str.replace(/[-_\\s]/gi, 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\ No newline at end of file
diff --git a/src/index.js b/src/index.js
index 530a3a5..1dba5e9 100644
--- a/src/index.js
+++ b/src/index.js
@@ -6,3 +6,4 @@ export { randomNIE } from './randomNIE';
 export { ctrlChar } from './ctrlChar';
 export { randomNIFWith } from './randomNIFWith';
 export { randomNIEWith } from './randomNIEWith';
+export { normalize } from './normalize';
diff --git a/src/normalize.js b/src/normalize.js
new file mode 100644
index 0000000..45028ec
--- /dev/null
+++ b/src/normalize.js
@@ -0,0 +1,3 @@
+export const normalize = str => {
+  return str.replace(/[-_\s]/gi, '');
+};
diff --git a/test/normalize.test.js b/test/normalize.test.js
new file mode 100644
index 0000000..8987e59
--- /dev/null
+++ b/test/normalize.test.js
@@ -0,0 +1,13 @@
+const assert = require('assert');
+const { normalize } = require('../dist/index');
+
+describe.only('normalize', () => {
+  describe('clean', () => {
+    it('should 1', () => {
+      assert.equal(normalize('X-9464186 P'), 'X9464186P');
+    });
+    it('should 2', () => {
+      assert.equal(normalize('X-9464186-P'), 'X9464186P');
+    });
+  });
+});