diff --git a/lib/permissions/minimally-encoded-thread-permissions.js b/lib/permissions/minimally-encoded-thread-permissions.js
index b3dee9d7f..3bd0f8085 100644
--- a/lib/permissions/minimally-encoded-thread-permissions.js
+++ b/lib/permissions/minimally-encoded-thread-permissions.js
@@ -1,129 +1,174 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { parseThreadPermissionString } from './prefixes.js';
 import type {
   ThreadPermission,
   ThreadPermissionsInfo,
 } from '../types/thread-permission-types.js';
 import { entries } from '../utils/objects.js';
 
 // `baseRolePermissionEncoding` maps permission names to indices.
 // These indices represent the 6-bit basePermission part of the 10-bit role
 // permission encoding created by `rolePermissionToBitmaskHex`.
 // The 6-bit basePermission allows for up to 2^6 = 64 different permissions.
 // If more than 64 permissions are needed, the encoding in
 // `rolePermissionToBitmaskHex` will need to be updated to accommodate this.
 const baseRolePermissionEncoding = Object.freeze({
   // TODO (atul): Update flow to `194.0.0` for bigint support
   // $FlowIssue bigint-unsupported
   know_of: BigInt(0),
   visible: BigInt(1),
   voiced: BigInt(2),
   edit_entries: BigInt(3),
   edit_thread: BigInt(4), // EDIT_THREAD_NAME
   edit_thread_description: BigInt(5),
   edit_thread_color: BigInt(6),
   delete_thread: BigInt(7),
   create_subthreads: BigInt(8), // CREATE_SUBCHANNELS
   create_sidebars: BigInt(9),
   join_thread: BigInt(10),
   edit_permissions: BigInt(11),
   add_members: BigInt(12),
   remove_members: BigInt(13),
   change_role: BigInt(14),
   leave_thread: BigInt(15),
   react_to_message: BigInt(16),
   edit_message: BigInt(17),
   edit_thread_avatar: BigInt(18),
   manage_pins: BigInt(19),
   manage_invite_links: BigInt(20),
 });
 
 // `minimallyEncodedThreadPermissions` is used to map each permission
 // to its respective bitmask where the index from `baseRolePermissionEncoding`
 // is used to set a specific bit in the bitmask. This is used in the
 // `permissionsToBitmaskHex` function where each permission is represented as a
 // single bit and the final bitmask is the union of all granted permissions.
 const minimallyEncodedThreadPermissions = Object.fromEntries(
   Object.keys(baseRolePermissionEncoding).map((key, idx) => [
     key,
     BigInt(1) << BigInt(idx),
   ]),
 );
 
 // This function converts a set of permissions to a hex-encoded bitmask.
 // Each permission is represented as a single bit in the bitmask.
 const permissionsToBitmaskHex = (
   permissions: ThreadPermissionsInfo,
 ): string => {
   let bitmask = BigInt(0);
   for (const [key, permission] of entries(permissions)) {
     if (permission.value && key in minimallyEncodedThreadPermissions) {
       invariant(
         // TODO (atul): Update flow to `194.0.0` for bigint support
         // $FlowIssue illegal-typeof
         typeof minimallyEncodedThreadPermissions[key] === 'bigint',
         'must be bigint',
       );
       bitmask |= minimallyEncodedThreadPermissions[key];
     }
   }
   return bitmask.toString(16);
 };
 
 const hasPermission = (
   permissionsBitmaskHex: string,
   permission: ThreadPermission,
 ): boolean => {
   const permissionsBitmask = BigInt(`0x${permissionsBitmaskHex}`);
   if (!(permission in minimallyEncodedThreadPermissions)) {
     return false;
   }
   const permissionBitmask = minimallyEncodedThreadPermissions[permission];
   invariant(
     // TODO (atul): Update flow to `194.0.0` for bigint support
     // $FlowIssue illegal-typeof
     typeof permissionBitmask === 'bigint',
     'permissionBitmask must be of type bigint',
   );
   return (permissionsBitmask & permissionBitmask) !== BigInt(0);
 };
 
 const propagationPrefixes = Object.freeze({
   '': BigInt(0),
   'descendant_': BigInt(1),
   'child_': BigInt(2),
 });
 const filterPrefixes = Object.freeze({
   '': BigInt(0),
   'open_': BigInt(1),
   'toplevel_': BigInt(2),
   'opentoplevel_': BigInt(3),
 });
 
 // Role Permission Bitmask Structure
 // [9 8 7 6 5 4 3 2 1 0] - bit positions
 // [b b b b b b p p f f] - symbol representation
 // b = basePermission    (6 bits)
 // p = propagationPrefix (2 bits)
 // f = filterPrefix      (2 bits)
 const rolePermissionToBitmaskHex = (threadRolePermission: string): string => {
   const parsed = parseThreadPermissionString(threadRolePermission);
   const basePermissionBits =
     baseRolePermissionEncoding[parsed.permission] & BigInt(63);
   const propagationPrefixBits =
     propagationPrefixes[parsed.propagationPrefix ?? ''] & BigInt(3);
   const filterPrefixBits =
     filterPrefixes[parsed.filterPrefix ?? ''] & BigInt(3);
 
   const bitmask =
     (basePermissionBits << BigInt(4)) |
     (propagationPrefixBits << BigInt(2)) |
     filterPrefixBits;
 
   return bitmask.toString(16).padStart(3, '0');
 };
 
-export { permissionsToBitmaskHex, hasPermission, rolePermissionToBitmaskHex };
+const inverseBaseRolePermissionEncoding = new Map(
+  Object.entries(baseRolePermissionEncoding).map(([key, value]) => [
+    value,
+    key,
+  ]),
+);
+
+// $FlowIssue bigint-unsupported
+const inversePropagationPrefixes: Map<bigint, string> = new Map(
+  Object.entries(propagationPrefixes).map(([key, value]) => [value, key]),
+);
+// $FlowIssue bigint-unsupported
+const inverseFilterPrefixes: Map<bigint, string> = new Map(
+  Object.entries(filterPrefixes).map(([key, value]) => [value, key]),
+);
+const decodeRolePermissionBitmask = (bitmask: string): string => {
+  const bitmaskInt = BigInt(`0x${bitmask}`);
+  const basePermission = (bitmaskInt >> BigInt(4)) & BigInt(63);
+  const propagationPrefix = (bitmaskInt >> BigInt(2)) & BigInt(3);
+  const filterPrefix = bitmaskInt & BigInt(3);
+
+  const basePermissionString =
+    inverseBaseRolePermissionEncoding.get(basePermission);
+  const propagationPrefixString =
+    inversePropagationPrefixes.get(propagationPrefix) ?? '';
+  const filterPrefixString = inverseFilterPrefixes.get(filterPrefix) ?? '';
+
+  invariant(
+    basePermissionString !== null &&
+      basePermissionString !== undefined &&
+      propagationPrefixString !== null &&
+      propagationPrefixString !== undefined &&
+      filterPrefixString !== null &&
+      filterPrefixString !== undefined,
+    'invalid bitmask',
+  );
+
+  return `${propagationPrefixString}${filterPrefixString}${basePermissionString}`;
+};
+
+export {
+  permissionsToBitmaskHex,
+  hasPermission,
+  rolePermissionToBitmaskHex,
+  decodeRolePermissionBitmask,
+};
diff --git a/lib/permissions/minimally-encoded-thread-permissions.test.js b/lib/permissions/minimally-encoded-thread-permissions.test.js
index 090c5c125..93bf0524f 100644
--- a/lib/permissions/minimally-encoded-thread-permissions.test.js
+++ b/lib/permissions/minimally-encoded-thread-permissions.test.js
@@ -1,90 +1,127 @@
 // @flow
 
 import {
+  decodeRolePermissionBitmask,
   hasPermission,
   permissionsToBitmaskHex,
   rolePermissionToBitmaskHex,
 } from './minimally-encoded-thread-permissions.js';
 
 describe('minimallyEncodedThreadPermissions', () => {
   const permissions = {
     know_of: { value: true, source: '1' },
     visible: { value: true, source: '1' },
     voiced: { value: true, source: '1' },
     edit_entries: { value: true, source: '1' },
     edit_thread: { value: true, source: '1' },
     edit_thread_description: { value: true, source: '1' },
     edit_thread_color: { value: true, source: '1' },
     delete_thread: { value: true, source: '1' },
     create_subthreads: { value: true, source: '1' },
     create_sidebars: { value: true, source: '1' },
     join_thread: { value: false, source: null },
     edit_permissions: { value: false, source: null },
     add_members: { value: true, source: '1' },
     remove_members: { value: true, source: '1' },
     change_role: { value: true, source: '1' },
     leave_thread: { value: false, source: null },
     react_to_message: { value: true, source: '1' },
     edit_message: { value: true, source: '1' },
   };
 
   it('should encode ThreadPermissionsInfo as bitmask', () => {
     const permissionsBitmask = permissionsToBitmaskHex(permissions);
     expect(permissionsBitmask).toBe('373ff');
     expect(hasPermission(permissionsBitmask, 'know_of')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'visible')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'voiced')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'edit_entries')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'edit_thread')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'edit_thread_description')).toBe(
       true,
     );
     expect(hasPermission(permissionsBitmask, 'edit_thread_color')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'delete_thread')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'create_subthreads')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'create_sidebars')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'join_thread')).toBe(false);
     expect(hasPermission(permissionsBitmask, 'edit_permissions')).toBe(false);
     expect(hasPermission(permissionsBitmask, 'remove_members')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'change_role')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'leave_thread')).toBe(false);
     expect(hasPermission(permissionsBitmask, 'react_to_message')).toBe(true);
     expect(hasPermission(permissionsBitmask, 'edit_message')).toBe(true);
   });
 });
 
 describe('rolePermissionToBitmaskHex', () => {
   it('should encode `child_opentoplevel_visible` successfully', () => {
     expect(rolePermissionToBitmaskHex('child_opentoplevel_visible')).toBe(
       '01b',
     );
   });
 
   it('should encode `child_opentoplevel_know_of` successfully', () => {
     expect(rolePermissionToBitmaskHex('child_opentoplevel_know_of')).toBe(
       '00b',
     );
   });
 
   it('should encode `child_toplevel_visible` successfully', () => {
     expect(rolePermissionToBitmaskHex('child_toplevel_visible')).toBe('01a');
   });
 
   it('should encode `child_toplevel_know_of` successfully', () => {
     expect(rolePermissionToBitmaskHex('child_toplevel_know_of')).toBe('00a');
   });
 
   it('should encode `child_opentoplevel_join_thread` successfully', () => {
     expect(rolePermissionToBitmaskHex('child_opentoplevel_join_thread')).toBe(
       '0ab',
     );
   });
 
   it('should encode `child_visible` successfully', () => {
     expect(rolePermissionToBitmaskHex('child_visible')).toBe('018');
   });
 
   it('should encode `child_know_of` successfully', () => {
     expect(rolePermissionToBitmaskHex('child_know_of')).toBe('008');
   });
 });
+
+describe('decodeRolePermissionBitmask', () => {
+  it('should decode `01b` to `child_opentoplevel_visible` successfully', () => {
+    expect(decodeRolePermissionBitmask('01b')).toBe(
+      'child_opentoplevel_visible',
+    );
+  });
+
+  it('should decode `00b` to `child_opentoplevel_know_of` successfully', () => {
+    expect(decodeRolePermissionBitmask('00b')).toBe(
+      'child_opentoplevel_know_of',
+    );
+  });
+
+  it('should decode `01a` to `child_toplevel_visible` successfully', () => {
+    expect(decodeRolePermissionBitmask('01a')).toBe('child_toplevel_visible');
+  });
+
+  it('should decode `00a` to `child_toplevel_know_of` successfully', () => {
+    expect(decodeRolePermissionBitmask('00a')).toBe('child_toplevel_know_of');
+  });
+
+  it('should decode `0ab` to `child_opentoplevel_join_thread` successfully', () => {
+    expect(decodeRolePermissionBitmask('0ab')).toBe(
+      'child_opentoplevel_join_thread',
+    );
+  });
+
+  it('should decode `018` to `child_visible` successfully', () => {
+    expect(decodeRolePermissionBitmask('018')).toBe('child_visible');
+  });
+
+  it('should decode `008` to `child_know_of` successfully', () => {
+    expect(decodeRolePermissionBitmask('008')).toBe('child_know_of');
+  });
+});