diff --git a/guide.md b/guide.md
index cb2fd1776d..12b0b387fc 100644
--- a/guide.md
+++ b/guide.md
@@ -146,7 +146,7 @@ The parameter of `rrweb.record` accepts the following options.
 | ignoreCSSAttributes      | null               | array of CSS attributes that should be ignored                                                                                                                                                |
 | maskAllText              | false              | mask all text content as \*                                                                                                                                                                   |
 | maskTextClass            | 'rr-mask'          | Use a string or RegExp to configure which elements should be masked, refer to the [privacy](#privacy) chapter                                                                                 |
-| unmaskTextClass          | 'rr-unmask'        | Use a string or RegExp to configure which elements should be unmasked, refer to the [privacy](#privacy) chapter                                                                               |
+| unmaskTextClass          | null               | Use a string or RegExp to configure which elements should be unmasked, refer to the [privacy](#privacy) chapter                                                                               |
 | maskTextSelector         | null               | Use a string to configure which selector should be masked, refer to the [privacy](#privacy) chapter                                                                                           |
 | unmaskTextSelector       | null               | Use a string to configure which selector should be unmasked, refer to the [privacy](#privacy) chapter                                                                                         |
 | maskAllInputs            | false              | mask all input content as \*                                                                                                                                                                  |
diff --git a/packages/rrweb-snapshot/src/snapshot.ts b/packages/rrweb-snapshot/src/snapshot.ts
index 8f146fac42..5cfb604b90 100644
--- a/packages/rrweb-snapshot/src/snapshot.ts
+++ b/packages/rrweb-snapshot/src/snapshot.ts
@@ -331,16 +331,18 @@ function distanceToSelectorMatch(el: HTMLElement, selector: string): number {
 
 function distanceToMatch(
   el: HTMLElement,
-  className: string | RegExp,
+  className: string | RegExp | null,
   selector: string | null,
 ): number {
   let classDistance = -1;
   let selectorDistance = -1;
 
-  if (typeof className === 'string') {
-    classDistance = distanceToSelectorMatch(el, `.${className}`);
-  } else {
-    classDistance = distanceToClassRegexMatch(el, className, true);
+  if (className) {
+    if (typeof className === 'string') {
+      classDistance = distanceToSelectorMatch(el, `.${className}`);
+    } else {
+      classDistance = distanceToClassRegexMatch(el, className, true);
+    }
   }
 
   if (selector) {
@@ -360,7 +362,7 @@ export function needMaskingText(
   node: Node,
   maskTextClass: string | RegExp,
   maskTextSelector: string | null,
-  unmaskTextClass: string | RegExp,
+  unmaskTextClass: string | RegExp | null,
   unmaskTextSelector: string | null,
   maskAllText: boolean,
 ): boolean {
@@ -479,7 +481,7 @@ function serializeNode(
     blockSelector: string | null;
     maskAllText: boolean;
     maskTextClass: string | RegExp;
-    unmaskTextClass: string | RegExp;
+    unmaskTextClass: string | RegExp | null;
     maskTextSelector: string | null;
     unmaskTextSelector: string | null;
     inlineStylesheet: boolean;
@@ -598,7 +600,7 @@ function serializeTextNode(
   options: {
     maskAllText: boolean;
     maskTextClass: string | RegExp;
-    unmaskTextClass: string | RegExp;
+    unmaskTextClass: string | RegExp | null;
     maskTextSelector: string | null;
     unmaskTextSelector: string | null;
     maskTextFn: MaskTextFn | undefined;
@@ -690,7 +692,7 @@ function serializeElementNode(
     rootId: number | undefined;
     maskAllText: boolean;
     maskTextClass: string | RegExp;
-    unmaskTextClass: string | RegExp;
+    unmaskTextClass: string | RegExp | null;
     maskTextSelector: string | null;
     unmaskTextSelector: string | null;
   },
@@ -1016,7 +1018,7 @@ export function serializeNodeWithId(
     blockClass: string | RegExp;
     blockSelector: string | null;
     maskTextClass: string | RegExp;
-    unmaskTextClass: string | RegExp;
+    unmaskTextClass: string | RegExp | null;
     maskTextSelector: string | null;
     unmaskTextSelector: string | null;
     skipChild: boolean;
@@ -1312,7 +1314,7 @@ function snapshot(
     blockSelector?: string | null;
     maskAllText?: boolean;
     maskTextClass?: string | RegExp;
-    unmaskTextClass?: string | RegExp;
+    unmaskTextClass?: string | RegExp | null;
     maskTextSelector?: string | null;
     unmaskTextSelector?: string | null;
     inlineStylesheet?: boolean;
@@ -1344,7 +1346,7 @@ function snapshot(
     blockSelector = null,
     maskAllText = false,
     maskTextClass = 'rr-mask',
-    unmaskTextClass = 'rr-unmask',
+    unmaskTextClass = null,
     maskTextSelector = null,
     unmaskTextSelector = null,
     inlineStylesheet = true,
diff --git a/packages/rrweb/src/record/index.ts b/packages/rrweb/src/record/index.ts
index 7113e52942..3c84ff9fe0 100644
--- a/packages/rrweb/src/record/index.ts
+++ b/packages/rrweb/src/record/index.ts
@@ -63,7 +63,7 @@ function record<T = eventWithTime>(
     ignoreClass = 'rr-ignore',
     maskAllText = false,
     maskTextClass = 'rr-mask',
-    unmaskTextClass = 'rr-unmask',
+    unmaskTextClass = null,
     maskTextSelector = null,
     unmaskTextSelector = null,
     inlineStylesheet = true,
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index d2cf125b87..1d649e7742 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -179,7 +179,7 @@ export type canvasEventWithTime = eventWithTime & {
 export type blockClass = string | RegExp;
 
 export type maskTextClass = string | RegExp;
-export type unmaskTextClass = string | RegExp;
+export type unmaskTextClass = string | RegExp | null;
 
 export type SamplingStrategy = Partial<{
   /**