diff --git a/sdk/cosmosdb/cosmos/package.json b/sdk/cosmosdb/cosmos/package.json
index 4ba12a282fc6..744e970c94f2 100644
--- a/sdk/cosmosdb/cosmos/package.json
+++ b/sdk/cosmosdb/cosmos/package.json
@@ -18,7 +18,8 @@
   "main": "./dist/index.js",
   "module": "./dist-esm/index.js",
   "browser": {
-    "./dist-esm/request/defaultAgent.js": "./dist-esm/request/defaultAgent.browser.js"
+    "./dist-esm/request/defaultAgent.js": "./dist-esm/request/defaultAgent.browser.js",
+    "./dist-esm/utils/atob.js": "./dist-esm/utils/atob.browser.js"
   },
   "files": [
     "changelog.md",
@@ -72,7 +73,6 @@
   "dependencies": {
     "@azure/cosmos-sign": "^1.0.2",
     "@types/debug": "^4.1.4",
-    "atob": "^2.1.2",
     "binary-search-bounds": "^2.0.3",
     "crypto-hash": "^1.1.0",
     "debug": "^4.1.1",
diff --git a/sdk/cosmosdb/cosmos/src/session/sessionContainer.ts b/sdk/cosmosdb/cosmos/src/session/sessionContainer.ts
index efaf8dfef2de..3a89af16585e 100644
--- a/sdk/cosmosdb/cosmos/src/session/sessionContainer.ts
+++ b/sdk/cosmosdb/cosmos/src/session/sessionContainer.ts
@@ -1,6 +1,6 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
-import atob from "atob";
+import atob from "../utils/atob";
 import { Constants, getContainerLink, OperationType, ResourceType, trimSlashes } from "../common";
 import { CosmosHeaders } from "../queryExecutionContext";
 import { SessionContext } from "./SessionContext";
diff --git a/sdk/cosmosdb/cosmos/src/typings/atob.d.ts b/sdk/cosmosdb/cosmos/src/typings/atob.d.ts
deleted file mode 100644
index f8e5a8d16505..000000000000
--- a/sdk/cosmosdb/cosmos/src/typings/atob.d.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-// Copyright (c) Microsoft Corporation.
-// Licensed under the MIT license.
-declare module "atob" {
-  const _atob: typeof atob;
-  export = _atob;
-}
diff --git a/sdk/cosmosdb/cosmos/src/utils/atob.browser.ts b/sdk/cosmosdb/cosmos/src/utils/atob.browser.ts
new file mode 100644
index 000000000000..af346b5f4736
--- /dev/null
+++ b/sdk/cosmosdb/cosmos/src/utils/atob.browser.ts
@@ -0,0 +1,5 @@
+if ("function" === typeof atob) {
+  throw new Error("Your browser environment is missing the global `atob` function");
+}
+
+export default atob;
diff --git a/sdk/cosmosdb/cosmos/src/utils/atob.ts b/sdk/cosmosdb/cosmos/src/utils/atob.ts
new file mode 100644
index 000000000000..befa418b5c23
--- /dev/null
+++ b/sdk/cosmosdb/cosmos/src/utils/atob.ts
@@ -0,0 +1,3 @@
+export default function atob(str: string) {
+  return Buffer.from(str, "base64").toString("binary");
+}