diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2ccfcfe
--- /dev/null
+++ b/README.md
@@ -0,0 +1,40 @@
+# uint8-base64
+
+[![NPM version][npm-image]][npm-url]
+[![build status][ci-image]][ci-url]
+[![Test coverage][codecov-image]][codecov-url]
+[![npm download][download-image]][download-url]
+
+You can find a lot of NPM libraries dealing with base64 encoding and decoding.
+
+However we could not find one that would have as input AND output an Uint8Array. This library does exactly this.
+
+This library is pretty fast and will convert over 500 Mb per second in nodejs as well as in the browser.
+
+## Installation
+
+`$ npm i uint8-base64`
+
+## Usage
+
+```js
+import { encode } from 'uint8-base64';
+
+const result = myModule(args);
+// result is ...
+```
+
+## License
+
+The code was largely inspired by: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727
+
+[MIT](./LICENSE)
+
+[npm-image]: https://img.shields.io/npm/v/uint8-base64.svg
+[npm-url]: https://www.npmjs.com/package/uint8-base64
+[ci-image]: https://github.com/cheminfo/uint8-base64/workflows/Node.js%20CI/badge.svg?branch=main
+[ci-url]: https://github.com/cheminfo/uint8-base64/actions?query=workflow%3A%22Node.js+CI%22
+[codecov-image]: https://img.shields.io/codecov/c/github/cheminfo/uint8-base64.svg
+[codecov-url]: https://codecov.io/gh/cheminfo/uint8-base64
+[download-image]: https://img.shields.io/npm/dm/uint8-base64.svg
+[download-url]: https://www.npmjs.com/package/uint8-base64
diff --git a/benchmark/big.js b/benchmark/big.js
new file mode 100644
index 0000000..51e3f71
--- /dev/null
+++ b/benchmark/big.js
@@ -0,0 +1,56 @@
+'use strict';
+
+const { Buffer } = require('buffer');
+
+const { decode, encode } = require('../lib/');
+
+const textEncoder = new TextEncoder();
+const textDecoder = new TextDecoder();
+
+let string = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNIOQRSTUVWXYZ';
+for (let i = 0; i < 20; i++) {
+  string += string;
+}
+
+const uint8 = textEncoder.encode(string);
+const buffer = Buffer.from(string, 'utf8');
+
+console.time('btoa');
+const btoaString = btoa(string);
+console.timeEnd('btoa');
+
+console.time('atob');
+const atobString = atob(btoaString);
+console.timeEnd('atob');
+
+console.time('buffer.toString');
+const bufferToString = buffer.toString('base64');
+console.timeEnd('buffer.toString');
+
+console.time('Buffer.from');
+const bufferFrom = Buffer.from(bufferToString, 'base64');
+console.timeEnd('Buffer.from');
+
+console.time('encode');
+const bufferBase64 = encode(uint8);
+console.timeEnd('encode');
+
+console.time('decode');
+const newBuffer = decode(bufferBase64);
+console.timeEnd('decode');
+
+const newString = textDecoder.decode(newBuffer);
+
+console.log(
+  string.length,
+  uint8.length,
+  atobString.length,
+  bufferFrom.length,
+  bufferBase64.length,
+  bufferToString.length,
+  btoaString.length,
+  btoaString === textDecoder.decode(bufferBase64),
+  newString === string,
+  newString === atobString,
+  newString === textDecoder.decode(bufferFrom),
+);
diff --git a/package.json b/package.json
index b2f76f8..cbc2dd5 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
-  "name": "base64-tools",
+  "name": "uint8-base64",
   "version": "0.0.0",
-  "description": "Encode and decode base64 from and to uint8 and arraybuffer",
+  "description": "Encode and decode base64 from and to Uint8Array",
   "main": "./lib/index.js",
   "module": "./lib-esm/index.js",
   "types": "./lib/index.d.ts",
@@ -30,24 +30,28 @@
   },
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/cheminfo/base64-tools.git"
+    "url": "git+https://github.com/cheminfo/uint8-base64.git"
   },
   "bugs": {
-    "url": "https://github.com/cheminfo/base64-tools/issues"
+    "url": "https://github.com/cheminfo/uint8-base64/issues"
   },
-  "homepage": "https://github.com/cheminfo/base64-tools#readme",
+  "homepage": "https://github.com/cheminfo/uint8-base64#readme",
   "jest": {
     "preset": "ts-jest",
-    "testEnvironment": "node"
+    "testEnvironment": "node",
+    "testPathIgnorePatterns": [
+      "node_modules",
+      "data.ts"
+    ]
   },
   "devDependencies": {
     "@types/jest": "^27.0.1",
     "eslint": "^7.32.0",
     "eslint-config-cheminfo-typescript": "^8.0.9",
-    "jest": "^27.0.6",
+    "jest": "^27.1.0",
     "prettier": "^2.3.2",
     "rimraf": "^3.0.2",
-    "ts-jest": "^27.0.3",
-    "typescript": "^4.3.5"
+    "ts-jest": "^27.0.5",
+    "typescript": "^4.4.2"
   }
 }
diff --git a/src/__tests__/data.ts b/src/__tests__/data.ts
new file mode 100644
index 0000000..bf92847
--- /dev/null
+++ b/src/__tests__/data.ts
@@ -0,0 +1,15 @@
+export const tests = [
+  //  ['', ''],
+  // ['TWFu', 'Man'],
+  ['QQ==', 'A'],
+  // ['SGVsbG8gd29ybGQ=', 'Hello world'],
+  //['SGVsbG8gd29ybGRzIQ==', 'Hello worlds!'],
+];
+
+export const allBytes = new Uint8Array(256);
+for (let i = 0; i < 256; i++) {
+  allBytes[i] = i;
+}
+
+export const base64AllBytes =
+  'AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3BxcnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmqq6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==';
diff --git a/src/__tests__/decode.test.ts b/src/__tests__/decode.test.ts
new file mode 100644
index 0000000..0f1b098
--- /dev/null
+++ b/src/__tests__/decode.test.ts
@@ -0,0 +1,22 @@
+import { decode } from '..';
+
+import { tests, allBytes, base64AllBytes } from './data';
+
+const textEncoder = new TextEncoder();
+
+describe('decode', () => {
+  it.each(tests)('%s -> %s', (base64: string, binary: string) => {
+    const encodedBase64 = textEncoder.encode(base64);
+    const encodedBinary = textEncoder.encode(binary);
+    expect(Array.from(decode(encodedBase64))).toStrictEqual(
+      Array.from(encodedBinary),
+    );
+  });
+
+  it('All possibles values', () => {
+    const encodeBase64 = textEncoder.encode(base64AllBytes);
+    expect(Array.from(decode(encodeBase64))).toStrictEqual(
+      Array.from(allBytes),
+    );
+  });
+});
diff --git a/src/__tests__/encode.test.ts b/src/__tests__/encode.test.ts
new file mode 100644
index 0000000..1c83b37
--- /dev/null
+++ b/src/__tests__/encode.test.ts
@@ -0,0 +1,22 @@
+import { encode } from '..';
+
+import { tests, allBytes, base64AllBytes } from './data';
+
+const textEncoder = new TextEncoder();
+
+describe('encode', () => {
+  it.each(tests)('%s -> %s', (base64: string, binary: string) => {
+    const encodedBinary = textEncoder.encode(binary);
+    const encodedBase64 = textEncoder.encode(base64);
+    expect(Array.from(encode(encodedBinary))).toStrictEqual(
+      Array.from(encodedBase64),
+    );
+  });
+
+  it('All possibles values', () => {
+    const encodedBase64 = textEncoder.encode(base64AllBytes);
+    expect(Array.from(encode(allBytes))).toStrictEqual(
+      Array.from(encodedBase64),
+    );
+  });
+});
diff --git a/src/decode.ts b/src/decode.ts
new file mode 100644
index 0000000..eeac136
--- /dev/null
+++ b/src/decode.ts
@@ -0,0 +1,44 @@
+const base64codes = Uint8Array.from([
+  255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+  255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+  255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255,
+  255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 0, 255, 255,
+  255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
+  21, 22, 23, 24, 25, 255, 255, 255, 255, 255, 255, 26, 27, 28, 29, 30, 31, 32,
+  33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
+]);
+
+/**
+ * Convert a Uint8Array containing a base64 encoded bytes to a Uint8Array containing decoded values
+ * @returns a Uint8Array containing the decoded bytes
+ */
+
+export function decode(
+  input: Uint8Array, //| ArrayBuffer,
+): Uint8Array {
+  if (!ArrayBuffer.isView(input)) {
+    input = new Uint8Array(input);
+  }
+
+  if (input.length % 4 !== 0) {
+    throw new Error('Unable to parse base64 string.');
+  }
+
+  let output = new Uint8Array(3 * (input.length / 4));
+  if (input.length === 0) return output;
+
+  const missingOctets =
+    input[input.length - 2] === 61 ? 2 : input[input.length - 1] === 61 ? 1 : 0;
+
+  for (let i = 0, j = 0; i < input.length; i += 4, j += 3) {
+    const buffer =
+      (base64codes[input[i]] << 18) |
+      (base64codes[input[i + 1]] << 12) |
+      (base64codes[input[i + 2]] << 6) |
+      base64codes[input[i + 3]];
+    output[j] = buffer >> 16;
+    output[j + 1] = (buffer >> 8) & 0xff;
+    output[j + 2] = buffer & 0xff;
+  }
+  return output.subarray(0, output.length - missingOctets);
+}
diff --git a/src/encode.ts b/src/encode.ts
new file mode 100644
index 0000000..73a584c
--- /dev/null
+++ b/src/encode.ts
@@ -0,0 +1,39 @@
+const base64codes = Uint8Array.from([
+  65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
+  84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106,
+  107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
+  122, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 43, 47,
+]);
+
+/**
+ * Convert a Uint8Array containing bytes to a Uint8Array containing the base64 encoded values
+ * @returns a Uint8Array containing the encoded bytes
+ */
+
+export function encode(input: Uint8Array): Uint8Array {
+  const output = new Uint8Array(Math.ceil(input.length / 3) * 4);
+  let i, j;
+  for (i = 2, j = 0; i < input.length; i += 3, j += 4) {
+    output[j] = base64codes[input[i - 2] >> 2];
+    output[j + 1] =
+      base64codes[((input[i - 2] & 0x03) << 4) | (input[i - 1] >> 4)];
+    output[j + 2] = base64codes[((input[i - 1] & 0x0f) << 2) | (input[i] >> 6)];
+    output[j + 3] = base64codes[input[i] & 0x3f];
+  }
+  if (i === input.length + 1) {
+    // 1 octet yet to write
+    output[j] = base64codes[input[i - 2] >> 2];
+    output[j + 1] = base64codes[(input[i - 2] & 0x03) << 4];
+    output[j + 2] = 61;
+    output[j + 3] = 61;
+  }
+  if (i === input.length) {
+    // 2 octets yet to write
+    output[j] = base64codes[input[i - 2] >> 2];
+    output[j + 1] =
+      base64codes[((input[i - 2] & 0x03) << 4) | (input[i - 1] >> 4)];
+    output[j + 2] = base64codes[(input[i - 1] & 0x0f) << 2];
+    output[j + 3] = 61;
+  }
+  return output;
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..6267e16
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,2 @@
+export * from './decode';
+export * from './encode';