diff --git a/lib/modules/firestore/Blob.js b/lib/modules/firestore/Blob.js
index 7714ec34..63f02c6a 100644
--- a/lib/modules/firestore/Blob.js
+++ b/lib/modules/firestore/Blob.js
@@ -3,6 +3,9 @@ import Base64 from './utils/Base64';
 type BlobFormat = 'string' | 'array';
 
 export default class Blob {
+  _data: Uint8Array | string;
+  _type: BlobFormat;
+
   constructor(data, type: BlobFormat) {
     this._data = data;
     this._type = type;
@@ -14,7 +17,6 @@ export default class Blob {
    * @param base64 string
    */
   static fromBase64String(base64: string): Blob {
-    // TODO convert to Uint8Array?
     return new Blob(base64, 'string');
   }
 
@@ -23,7 +25,7 @@ export default class Blob {
    * @url https://firebase.google.com/docs/reference/js/firebase.firestore.Blob#.fromUint8Array
    * @param array Array
    */
-  static fromUint8Array(array: Array): Blob {
+  static fromUint8Array(array: Uint8Array): Blob {
     return new Blob(array, 'array');
   }
 
@@ -34,9 +36,15 @@ export default class Blob {
    * @returns boolean 'true' if this Blob is equal to the provided one.
    */
   isEqual(blob: Blob): boolean {
-    // TODO comparison checks
-    console.log(blob);
-    return true;
+    let thisBlobBase64 = '';
+    if (this._type === 'string') thisBlobBase64 = this._data;
+    else thisBlobBase64 = this.toBase64();
+
+    let thatBlobBase64 = '';
+    if (blob._type === 'string') thatBlobBase64 = blob._data;
+    else thatBlobBase64 = blob.toBase64();
+
+    return thisBlobBase64 === thatBlobBase64;
   }
 
   /**
@@ -63,9 +71,10 @@ export default class Blob {
    */
   toUint8Array(): Uint8Array {
     if (this._type === 'array') return this._data;
-    // TODO conversion
-    // TODO conversion
-    // TODO conversion
-    return new Uint8Array();
+    return new Uint8Array(
+      Base64.atob(this._data)
+        .split('')
+        .map(c => c.charCodeAt(0))
+    );
   }
 }