diff --git a/Backend/Auth.py b/Backend/Auth.py
index 73471c2..6c8330a 100644
--- a/Backend/Auth.py
+++ b/Backend/Auth.py
@@ -6,7 +6,7 @@ from typing import Any
 
 from fastapi import Depends, HTTPException, Request
 
-from Groups import AdminGroupName, GetGroupsForUser, IsUserInGroup
+from Groups import AdminGroupName, GetGroupsForUser, GuestGroupName, IsUserInGroup
 from Users import GetUser
 
 
@@ -14,6 +14,14 @@ ActiveSessions: dict[str, str] = {}
 
 SessionCookieName = "SaraViewSession"
 
+GuestUser: dict[str, Any] = {
+    "Username": None,
+    "IsAdmin": False,
+    "IsGuest": True,
+    "Groups": [GuestGroupName],
+    "Colour": "Purple",
+}
+
 
 def CreateSession(Username: str) -> str:
     Token = secrets.token_urlsafe(32)
@@ -25,6 +33,21 @@ def DeleteSession(Token: str) -> None:
     ActiveSessions.pop(Token, None)
 
 
+def _BuildUserRecord(Username: str, User: dict[str, Any]) -> dict[str, Any]:
+    UserGroups = GetGroupsForUser(Username)
+
+    if GuestGroupName not in UserGroups:
+        UserGroups = [*UserGroups, GuestGroupName]
+
+    return {
+        "Username": Username,
+        "IsAdmin": AdminGroupName in UserGroups,
+        "IsGuest": False,
+        "Groups": UserGroups,
+        "Colour": User.get("Colour", "Purple"),
+    }
+
+
 def GetCurrentUser(request: Request) -> dict[str, Any]:
     Token = request.cookies.get(SessionCookieName)
     Username = ActiveSessions.get(Token) if Token else None
@@ -37,14 +60,22 @@ def GetCurrentUser(request: Request) -> dict[str, Any]:
     if User is None:
         raise HTTPException(status_code=401, detail="Session user no longer exists.")
 
-    UserGroups = GetGroupsForUser(Username)
+    return _BuildUserRecord(Username, User)
 
-    return {
-        "Username": Username,
-        "IsAdmin": AdminGroupName in UserGroups,
-        "Groups": UserGroups,
-        "Colour": User.get("Colour", "Purple"),
-    }
+
+def GetCurrentUserOrGuest(request: Request) -> dict[str, Any]:
+    Token = request.cookies.get(SessionCookieName)
+    Username = ActiveSessions.get(Token) if Token else None
+
+    if Username is None:
+        return dict(GuestUser)
+
+    User = GetUser(Username)
+
+    if User is None:
+        return dict(GuestUser)
+
+    return _BuildUserRecord(Username, User)
 
 
 def RequireAdmin(CurrentUser: dict = Depends(GetCurrentUser)) -> dict:
diff --git a/Backend/Embeds.py b/Backend/Embeds.py
index cff20ee..1848413 100644
--- a/Backend/Embeds.py
+++ b/Backend/Embeds.py
@@ -8,6 +8,7 @@ from urllib.parse import quote
 
 from Core import ResolvePath
 from Explorer import ClassifyFile, GetDirectoryNoteInfo
+from Groups import GuestGroupName
 from Locks import IsPathAccessible
 from Portals import ResolvePortals
 from Preview import GetMimeType, ReadTextFile, TextFileTypes
@@ -33,7 +34,7 @@ def _StripMarkdownForExcerpt(Text: str) -> str:
 def _DescribeTextFile(RootName: str, RelativePath: str, FilePath: Path, Fallback: str) -> str:
     try:
         Content = ReadTextFile(FilePath)
-        Resolved = ResolvePortals(RootName, RelativePath, Content, "", [])
+        Resolved = ResolvePortals(RootName, RelativePath, Content, "", [GuestGroupName])
         Excerpt = _StripMarkdownForExcerpt(Resolved)
         return Excerpt or Fallback
     except (OSError, UnicodeDecodeError):
@@ -45,7 +46,7 @@ def _MetaTag(Property: str, Content: str) -> str:
 
 
 def BuildOgTags(RootName: str, RelativePath: str, IsDirectoryUrl: bool, BaseUrl: str) -> str | None:
-    if not IsPathAccessible(RootName, RelativePath, "", []):
+    if not IsPathAccessible(RootName, RelativePath, "", [GuestGroupName]):
         return None
 
     try:
diff --git a/Backend/Groups.py b/Backend/Groups.py
index 19bc62e..34d6790 100644
--- a/Backend/Groups.py
+++ b/Backend/Groups.py
@@ -10,6 +10,8 @@ from Settings import GetDataDirectory
 
 
 AdminGroupName = "Admin"
+GuestGroupName = "Guest"
+BuiltinGroupNames = (AdminGroupName, GuestGroupName)
 
 
 def GetGroupsPath():
@@ -25,7 +27,7 @@ def LoadGroups() -> dict[str, list[str]]:
         SeededAdmins = [
             Username for Username, Data in LoadUsers().items() if Data.get("IsAdmin", False)
         ]
-        Groups = {AdminGroupName: SeededAdmins}
+        Groups = {AdminGroupName: SeededAdmins, GuestGroupName: []}
         SaveGroups(Groups)
         return Groups
 
@@ -33,9 +35,14 @@ def LoadGroups() -> dict[str, list[str]]:
         Loaded = tomllib.load(GroupsFile)
 
     Groups = Loaded.get("Groups", {})
+    Changed = False
 
-    if AdminGroupName not in Groups:
-        Groups[AdminGroupName] = []
+    for BuiltinName in BuiltinGroupNames:
+        if BuiltinName not in Groups:
+            Groups[BuiltinName] = []
+            Changed = True
+
+    if Changed:
         SaveGroups(Groups)
 
     return Groups
@@ -69,8 +76,8 @@ def CreateGroup(Name: str) -> None:
 
 
 def DeleteGroup(Name: str) -> None:
-    if Name == AdminGroupName:
-        raise ValueError("The Admin group can't be deleted.")
+    if Name in BuiltinGroupNames:
+        raise ValueError(f"The {Name} group can't be deleted.")
 
     Groups = LoadGroups()
 
diff --git a/Backend/Main.py b/Backend/Main.py
index 2827329..6513892 100644
--- a/Backend/Main.py
+++ b/Backend/Main.py
@@ -13,7 +13,14 @@ from fastapi import Depends, FastAPI, File, HTTPException, Request, Response, Up
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse, HTMLResponse, PlainTextResponse, StreamingResponse
 
-from Auth import CreateSession, DeleteSession, GetCurrentUser, RequireAdmin, SessionCookieName
+from Auth import (
+    CreateSession,
+    DeleteSession,
+    GetCurrentUser,
+    GetCurrentUserOrGuest,
+    RequireAdmin,
+    SessionCookieName,
+)
 from BookReader import ReadBookForFile
 from Blame import LoadBlame, RenameUserInBlame, UpdateBlameOnSave
 from Core import ResolvePath
@@ -31,6 +38,7 @@ from Explorer import (
 from Groups import (
     CreateGroup,
     DeleteGroup,
+    GuestGroupName,
     ListGroups,
     RenameUserInGroups,
     SetGroupMembers,
@@ -46,6 +54,7 @@ from Locks import (
 from Portals import ResolvePortals
 from Preview import GetMimeType, ReadTextFile, StreamBinaryFile, TextFileTypes
 from Settings import (
+    DefaultSettings,
     DeleteTheme,
     ListThemeNames,
     LoadSettings,
@@ -196,7 +205,7 @@ async def PostProfileAvatarEndpoint(
 
 
 @Application.get("/api/profile/avatar")
-def GetProfileAvatarEndpoint(Username: str, CurrentUser: dict = Depends(GetCurrentUser)):
+def GetProfileAvatarEndpoint(Username: str, CurrentUser: dict = Depends(GetCurrentUserOrGuest)):
     AvatarPath = GetAvatarPath(Username)
 
     if AvatarPath is None:
@@ -347,18 +356,20 @@ def GetLocksEndpoint(CurrentUser: dict = Depends(RequireAdmin)) -> list[dict]:
 
 
 @Application.get("/api/roots")
-def GetRootsEndpoint(CurrentUser: dict = Depends(GetCurrentUser)) -> list[dict]:
+def GetRootsEndpoint(CurrentUser: dict = Depends(GetCurrentUserOrGuest)) -> list[dict]:
     return ListRoots()
 
 
 @Application.get("/api/tree")
 def GetTreeEndpoint(
-    Root: str, Path: str = "", CurrentUser: dict = Depends(GetCurrentUser)
+    Root: str, Path: str = "", CurrentUser: dict = Depends(GetCurrentUserOrGuest)
 ) -> list[dict]:
     RequirePathAccessible(Root, Path, CurrentUser)
 
     try:
-        UserSettings = LoadSettings(CurrentUser["Username"])
+        UserSettings = (
+            DefaultSettings if CurrentUser["Username"] is None else LoadSettings(CurrentUser["Username"])
+        )
         ShowHidden = UserSettings.get("ShowHiddenFolders", False)
         ShowSvFiles = UserSettings.get("ShowSvFiles", False)
         Entries = ListDirectory(Root, Path, ShowHidden, ShowSvFiles)
@@ -471,7 +482,7 @@ def DeleteTreeEndpoint(Root: str, Path: str, CurrentUser: dict = Depends(GetCurr
 
 @Application.get("/api/file")
 def GetFileEndpoint(
-    Root: str, Path: str, request: Request, CurrentUser: dict = Depends(GetCurrentUser)
+    Root: str, Path: str, request: Request, CurrentUser: dict = Depends(GetCurrentUserOrGuest)
 ):
     RequirePathAccessible(Root, Path, CurrentUser)
 
@@ -493,7 +504,7 @@ def GetFileEndpoint(
 
 @Application.get("/api/file/resolved")
 def GetResolvedFileEndpoint(
-    Root: str, Path: str, CurrentUser: dict = Depends(GetCurrentUser)
+    Root: str, Path: str, CurrentUser: dict = Depends(GetCurrentUserOrGuest)
 ) -> dict:
     RequirePathAccessible(Root, Path, CurrentUser)
 
@@ -548,7 +559,7 @@ async def PutFileEndpoint(
 
 
 @Application.get("/api/blame")
-def GetBlameEndpoint(Root: str, Path: str, CurrentUser: dict = Depends(GetCurrentUser)) -> dict:
+def GetBlameEndpoint(Root: str, Path: str, CurrentUser: dict = Depends(GetCurrentUserOrGuest)) -> dict:
     RequirePathAccessible(Root, Path, CurrentUser)
 
     try:
@@ -588,7 +599,7 @@ def GetBlameEndpoint(Root: str, Path: str, CurrentUser: dict = Depends(GetCurren
 
 @Application.get("/api/raw/{RootName}/{FilePath:path}")
 def GetRawFileEndpoint(
-    RootName: str, FilePath: str, CurrentUser: dict = Depends(GetCurrentUser)
+    RootName: str, FilePath: str, CurrentUser: dict = Depends(GetCurrentUserOrGuest)
 ):
     RequirePathAccessible(RootName, FilePath, CurrentUser)
 
@@ -611,7 +622,7 @@ def GetRawFileEndpoint(
 
 
 @Application.get("/api/book")
-def GetBookEndpoint(Root: str, Path: str, CurrentUser: dict = Depends(GetCurrentUser)) -> dict:
+def GetBookEndpoint(Root: str, Path: str, CurrentUser: dict = Depends(GetCurrentUserOrGuest)) -> dict:
     RequirePathAccessible(Root, Path, CurrentUser)
 
     try:
@@ -624,7 +635,10 @@ def GetBookEndpoint(Root: str, Path: str, CurrentUser: dict = Depends(GetCurrent
 
 
 @Application.get("/api/settings")
-def GetSettingsEndpoint(CurrentUser: dict = Depends(GetCurrentUser)) -> dict:
+def GetSettingsEndpoint(CurrentUser: dict = Depends(GetCurrentUserOrGuest)) -> dict:
+    if CurrentUser["Username"] is None:
+        return dict(DefaultSettings)
+
     return LoadSettings(CurrentUser["Username"])
 
 
@@ -639,7 +653,7 @@ def GetThemesEndpoint(CurrentUser: dict = Depends(GetCurrentUser)) -> list[str]:
 
 
 @Application.get("/api/theme")
-def GetThemeEndpoint(Name: str, CurrentUser: dict = Depends(GetCurrentUser)) -> dict:
+def GetThemeEndpoint(Name: str, CurrentUser: dict = Depends(GetCurrentUserOrGuest)) -> dict:
     try:
         return LoadTheme(Name)
     except FileNotFoundError as Error:
@@ -678,7 +692,7 @@ def DeleteThemeEndpoint(Name: str, CurrentUser: dict = Depends(GetCurrentUser))
 
 @Application.get("/public/media/{RootName}/{FilePath:path}")
 def GetPublicMediaEndpoint(RootName: str, FilePath: str, request: Request):
-    if not IsPathAccessible(RootName, FilePath, "", []):
+    if not IsPathAccessible(RootName, FilePath, "", [GuestGroupName]):
         raise HTTPException(status_code=404, detail="Not found.")
 
     try:
diff --git a/Frontend/src/App.jsx b/Frontend/src/App.jsx
index 1d8b69a..730bb83 100644
--- a/Frontend/src/App.jsx
+++ b/Frontend/src/App.jsx
@@ -53,6 +53,8 @@ function ParseLocationPath(Pathname) {
   return { RootName: RootName || null, Path: RestSegments.join("/"), IsDirectory };
 }
 
+const GuestUser = { Username: null, IsAdmin: false, IsGuest: true, Colour: "Purple" };
+
 export default function App() {
   const [AuthState, SetAuthState] = useState("Loading");
   const [CurrentUser, SetCurrentUser] = useState(null);
@@ -84,8 +86,10 @@ export default function App() {
     });
   }, []);
 
+  const IsUsable = AuthState === "LoggedIn" || AuthState === "Guest";
+
   useEffect(() => {
-    if (AuthState !== "LoggedIn") return;
+    if (!IsUsable) return;
 
     FetchRoots().then((Fetched) => {
       SetRoots(Fetched);
@@ -100,7 +104,7 @@ export default function App() {
   }, [AuthState]);
 
   useEffect(() => {
-    if (AuthState !== "LoggedIn" || !ActiveRoot) return;
+    if (!IsUsable || !ActiveRoot) return;
 
     const Url = BuildLocationPath(ActiveRoot, ViewPath, ViewIsDirectory);
     if (window.location.pathname !== Url) {
@@ -109,7 +113,7 @@ export default function App() {
   }, [AuthState, ActiveRoot, ViewPath, ViewIsDirectory]);
 
   useEffect(() => {
-    if (AuthState !== "LoggedIn") return;
+    if (!IsUsable) return;
 
     function HandlePopState() {
       RestoreFromLocation(Roots);
@@ -174,6 +178,16 @@ export default function App() {
     SetAuthState("LoggedOut");
   }
 
+  function HandleContinueAsGuest() {
+    SetCurrentUser(GuestUser);
+    SetAuthState("Guest");
+  }
+
+  function HandleRequestLogin() {
+    SetCurrentUser(null);
+    SetAuthState("LoggedOut");
+  }
+
   function HandleProfileUpdated(UpdatedUser) {
     SetCurrentUser((Existing) => ({ ...Existing, ...UpdatedUser }));
   }
@@ -272,9 +286,16 @@ export default function App() {
   }
 
   if (AuthState === "LoggedOut") {
-    return <LoginScreen IsBootstrap={false} OnAuthenticated={HandleAuthenticated} />;
+    return (
+      <LoginScreen
+        IsBootstrap={false}
+        OnAuthenticated={HandleAuthenticated}
+        OnContinueAsGuest={HandleContinueAsGuest}
+      />
+    );
   }
 
+  const IsGuest = AuthState === "Guest";
   const ShowTopBar = (Settings && Settings.ShowBreadcrumbs) || Roots.length > 1;
   const ConfirmBeforeDelete = Settings ? Settings.ConfirmBeforeDelete : true;
 
@@ -286,6 +307,7 @@ export default function App() {
         SelectedFile={ViewIsDirectory ? null : ViewPath}
         CurrentDirectoryPath={CurrentDirectoryPath}
         CurrentUser={CurrentUser}
+        IsGuest={IsGuest}
         OnSelectFile={HandleSelectFile}
         OnSelectDirectory={OpenDirectoryNote}
         OnNavigateDirectory={HandleNavigateDirectory}
@@ -293,6 +315,7 @@ export default function App() {
         OnEntryRenamed={HandleEntryRenamed}
         OnEntryDeleted={HandleEntryDeleted}
         OnOpenSettings={() => SetIsSettingsOpen(true)}
+        OnRequestLogin={HandleRequestLogin}
         OnEntryCreated={RefreshSidebar}
         UseHyphenBullets={Settings ? Settings.UseHyphenBullets : true}
         UseAsciiFolderIcons={Settings ? Settings.UseAsciiFolderIcons : true}
@@ -340,6 +363,7 @@ export default function App() {
               UseHyphenBullets={Settings ? Settings.UseHyphenBullets : true}
               UseAsciiFolderIcons={Settings ? Settings.UseAsciiFolderIcons : true}
               ConfirmBeforeDelete={ConfirmBeforeDelete}
+              IsGuest={IsGuest}
             />
           ) : (
             <PreviewPane
@@ -350,6 +374,7 @@ export default function App() {
               ShowGitBlame={Settings ? Settings.ShowGitBlame : false}
               ShowBlameAvatars={Settings ? Settings.ShowBlameAvatars : false}
               StickyToolbar={Settings ? Settings.StickyToolbar : true}
+              IsGuest={IsGuest}
             />
           )}
           {!ViewIsDirectory && !ViewNoteFilePath && (
diff --git a/Frontend/src/Components/DirectoryPane.jsx b/Frontend/src/Components/DirectoryPane.jsx
index 5e9fb1c..365b4c8 100644
--- a/Frontend/src/Components/DirectoryPane.jsx
+++ b/Frontend/src/Components/DirectoryPane.jsx
@@ -22,6 +22,7 @@ export default function DirectoryPane({
   UseHyphenBullets,
   UseAsciiFolderIcons,
   ConfirmBeforeDelete,
+  IsGuest,
 }) {
   const [Entries, SetEntries] = useState([]);
   const [LoadError, SetLoadError] = useState(null);
@@ -139,10 +140,12 @@ export default function DirectoryPane({
 
   return (
     <div className="DirectoryPane">
-      <div className="PreviewToolbar">
-        <button onClick={OpenCreateFileModal}>New File</button>
-        <button onClick={OpenCreateDirectoryModal}>New Directory</button>
-      </div>
+      {!IsGuest && (
+        <div className="PreviewToolbar">
+          <button onClick={OpenCreateFileModal}>New File</button>
+          <button onClick={OpenCreateDirectoryModal}>New Directory</button>
+        </div>
+      )}
       {LoadError && <div className="SidebarError">{LoadError}</div>}
       <div className="DirectoryList">
         {Entries.map((Entry) => (
@@ -159,29 +162,31 @@ export default function DirectoryPane({
                 : GetFileIcon(UseHyphenBullets)}
             </span>
             <span className="TreeLabel">{Entry.Name}</span>
-            <span className="TreeRowActions">
-              <button
-                className="TreeRowActionButton"
-                onClick={(Event) => HandleRequestLockEdit(Event, Entry)}
-                title="Access control"
-              >
-                🔒
-              </button>
-              <button
-                className="TreeRowActionButton"
-                onClick={(Event) => HandleRename(Event, Entry)}
-                title="Rename / move"
-              >
-                ✎
-              </button>
-              <button
-                className="TreeRowActionButton"
-                onClick={(Event) => HandleDelete(Event, Entry)}
-                title="Delete"
-              >
-                ✕
-              </button>
-            </span>
+            {!IsGuest && (
+              <span className="TreeRowActions">
+                <button
+                  className="TreeRowActionButton"
+                  onClick={(Event) => HandleRequestLockEdit(Event, Entry)}
+                  title="Access control"
+                >
+                  🔒
+                </button>
+                <button
+                  className="TreeRowActionButton"
+                  onClick={(Event) => HandleRename(Event, Entry)}
+                  title="Rename / move"
+                >
+                  ✎
+                </button>
+                <button
+                  className="TreeRowActionButton"
+                  onClick={(Event) => HandleDelete(Event, Entry)}
+                  title="Delete"
+                >
+                  ✕
+                </button>
+              </span>
+            )}
           </div>
         ))}
         {Entries.length === 0 && !LoadError && (
diff --git a/Frontend/src/Components/LoginScreen.jsx b/Frontend/src/Components/LoginScreen.jsx
index 75538f3..1c3dd6a 100644
--- a/Frontend/src/Components/LoginScreen.jsx
+++ b/Frontend/src/Components/LoginScreen.jsx
@@ -2,7 +2,7 @@ import React, { useState } from "react";
 
 import { Bootstrap, Login } from "../Api.js";
 
-export default function LoginScreen({ IsBootstrap, OnAuthenticated }) {
+export default function LoginScreen({ IsBootstrap, OnAuthenticated, OnContinueAsGuest }) {
   const [Username, SetUsername] = useState("");
   const [Password, SetPassword] = useState("");
   const [ConfirmPassword, SetConfirmPassword] = useState("");
@@ -74,6 +74,11 @@ export default function LoginScreen({ IsBootstrap, OnAuthenticated }) {
         <button type="submit" disabled={IsSubmitting}>
           {IsSubmitting ? "..." : IsBootstrap ? "Create account & log in" : "Log in"}
         </button>
+        {!IsBootstrap && OnContinueAsGuest && (
+          <button type="button" className="LoginGuestButton" onClick={OnContinueAsGuest}>
+            Continue as Guest
+          </button>
+        )}
       </form>
     </div>
   );
diff --git a/Frontend/src/Components/PreviewPane.jsx b/Frontend/src/Components/PreviewPane.jsx
index a4da8f0..8964ca9 100644
--- a/Frontend/src/Components/PreviewPane.jsx
+++ b/Frontend/src/Components/PreviewPane.jsx
@@ -170,6 +170,7 @@ export default function PreviewPane({
   ShowGitBlame,
   ShowBlameAvatars,
   StickyToolbar,
+  IsGuest,
 }) {
   const [Content, SetContent] = useState("");
   const [ResolvedContent, SetResolvedContent] = useState("");
@@ -259,7 +260,7 @@ export default function PreviewPane({
     return (
       <div className="PreviewFrame">
         <div className={ToolbarClass}>
-          <button onClick={() => SetIsEditing(true)}>Edit</button>
+          {!IsGuest && <button onClick={() => SetIsEditing(true)}>Edit</button>}
         </div>
         <iframe title={FilePath} sandbox="" src={GetRawFileUrl(RootName, FilePath)} />
       </div>
@@ -270,7 +271,7 @@ export default function PreviewPane({
     return (
       <div className="PreviewMarkdown">
         <div className={ToolbarClass}>
-          <button onClick={() => SetIsEditing(true)}>Edit</button>
+          {!IsGuest && <button onClick={() => SetIsEditing(true)}>Edit</button>}
         </div>
         <div
           className="MarkdownBody"
@@ -292,7 +293,7 @@ export default function PreviewPane({
     return (
       <div className="PreviewText">
         <div className={ToolbarClass}>
-          <button onClick={() => SetIsEditing(true)}>Edit</button>
+          {!IsGuest && <button onClick={() => SetIsEditing(true)}>Edit</button>}
         </div>
         <pre className="TextBody">{ResolvedContent}</pre>
       </div>
@@ -306,14 +307,17 @@ export default function PreviewPane({
           {(FileType === "markdown" || FileType === "text" || FileType === "html") && (
             <button onClick={() => SetIsEditing(false)}>View</button>
           )}
-          <button onClick={HandleSave} disabled={IsSaving}>
-            {IsSaving ? "Saving…" : "Save"}
-          </button>
+          {!IsGuest && (
+            <button onClick={HandleSave} disabled={IsSaving}>
+              {IsSaving ? "Saving…" : "Save"}
+            </button>
+          )}
           {SaveError && <span className="SaveErrorText">{SaveError}</span>}
         </div>
         <CodeMirror
           value={Content}
           height="100%"
+          editable={!IsGuest}
           extensions={[
             ...GetLanguageExtension(FileType),
             ...(ShowGitBlame ? [BuildBlameGutter(BlameMap, ShowBlameAvatars)] : []),
diff --git a/Frontend/src/Components/Sidebar.jsx b/Frontend/src/Components/Sidebar.jsx
index 1e461c8..17191b4 100644
--- a/Frontend/src/Components/Sidebar.jsx
+++ b/Frontend/src/Components/Sidebar.jsx
@@ -30,6 +30,7 @@ function TreeNode({
   UseAsciiFolderIcons,
   NavigateIntoDirectories,
   ConfirmBeforeDelete,
+  IsGuest,
 }) {
   const [IsExpanded, SetIsExpanded] = useState(false);
   const [Children, SetChildren] = useState(null);
@@ -134,17 +135,19 @@ function TreeNode({
             : GetFileIcon(UseHyphenBullets)}
         </span>
         <span className="TreeLabel">{Entry.Name}</span>
-        <span className="TreeRowActions">
-          <button className="TreeRowActionButton" onClick={HandleLockClick} title="Access control">
-            🔒
-          </button>
-          <button className="TreeRowActionButton" onClick={HandleRename} title="Rename / move">
-            ✎
-          </button>
-          <button className="TreeRowActionButton" onClick={HandleDelete} title="Delete">
-            ✕
-          </button>
-        </span>
+        {!IsGuest && (
+          <span className="TreeRowActions">
+            <button className="TreeRowActionButton" onClick={HandleLockClick} title="Access control">
+              🔒
+            </button>
+            <button className="TreeRowActionButton" onClick={HandleRename} title="Rename / move">
+              ✎
+            </button>
+            <button className="TreeRowActionButton" onClick={HandleDelete} title="Delete">
+              ✕
+            </button>
+          </span>
+        )}
       </div>
       {IsExpanded && Children && (
         <div className="TreeChildren">
@@ -167,6 +170,7 @@ function TreeNode({
               UseAsciiFolderIcons={UseAsciiFolderIcons}
               NavigateIntoDirectories={NavigateIntoDirectories}
               ConfirmBeforeDelete={ConfirmBeforeDelete}
+              IsGuest={IsGuest}
             />
           ))}
         </div>
@@ -175,7 +179,7 @@ function TreeNode({
   );
 }
 
-function UserBadge({ CurrentUser, OnOpenSettings }) {
+function UserBadge({ CurrentUser, OnOpenSettings, OnRequestLogin }) {
   const [AvatarFailed, SetAvatarFailed] = useState(false);
 
   useEffect(() => {
@@ -184,6 +188,16 @@ function UserBadge({ CurrentUser, OnOpenSettings }) {
 
   if (!CurrentUser) return null;
 
+  if (CurrentUser.IsGuest) {
+    return (
+      <span className="UserBadge" onClick={OnRequestLogin} title="Browsing as Guest - click to log in">
+        <span className="UserBadgeInitial" style={{ background: `var(--${CurrentUser.Colour || "Purple"})` }}>
+          G
+        </span>
+      </span>
+    );
+  }
+
   const AvatarUrl = CurrentUser.AvatarNonce
     ? `${GetAvatarUrl(CurrentUser.Username)}&v=${CurrentUser.AvatarNonce}`
     : GetAvatarUrl(CurrentUser.Username);
@@ -221,12 +235,14 @@ export default function Sidebar({
   OnEntryRenamed,
   OnEntryDeleted,
   OnOpenSettings,
+  OnRequestLogin,
   OnEntryCreated,
   UseHyphenBullets,
   UseAsciiFolderIcons,
   NavigateIntoDirectories,
   NewEntryButtonsAtTop,
   ConfirmBeforeDelete,
+  IsGuest,
 }) {
   const [RootEntries, SetRootEntries] = useState([]);
   const [LoadError, SetLoadError] = useState(null);
@@ -299,13 +315,15 @@ export default function Sidebar({
           SaraView
         </span>
         <span className="SidebarHeaderRight">
-          <UserBadge CurrentUser={CurrentUser} OnOpenSettings={OnOpenSettings} />
-          <button className="SettingsButton" onClick={OnOpenSettings}>
-            ⚙
-          </button>
+          <UserBadge CurrentUser={CurrentUser} OnOpenSettings={OnOpenSettings} OnRequestLogin={OnRequestLogin} />
+          {!IsGuest && (
+            <button className="SettingsButton" onClick={OnOpenSettings}>
+              ⚙
+            </button>
+          )}
         </span>
       </div>
-      {NewEntryButtonsAtTop && (
+      {NewEntryButtonsAtTop && !IsGuest && (
         <div className="SidebarNewEntry SidebarNewEntryTop">
           <button onClick={OpenCreateFileModal}>New File</button>
           <button onClick={OpenCreateDirectoryModal}>New Directory</button>
@@ -332,10 +350,11 @@ export default function Sidebar({
             UseAsciiFolderIcons={UseAsciiFolderIcons}
             NavigateIntoDirectories={NavigateIntoDirectories}
             ConfirmBeforeDelete={ConfirmBeforeDelete}
+            IsGuest={IsGuest}
           />
         ))}
       </div>
-      {!NewEntryButtonsAtTop && (
+      {!NewEntryButtonsAtTop && !IsGuest && (
         <div className="SidebarNewEntry">
           <button onClick={OpenCreateFileModal}>New File</button>
           <button onClick={OpenCreateDirectoryModal}>New Directory</button>
diff --git a/Frontend/src/Styles/Theme.css b/Frontend/src/Styles/Theme.css
index f9bf81f..b80b955 100644
--- a/Frontend/src/Styles/Theme.css
+++ b/Frontend/src/Styles/Theme.css
@@ -897,3 +897,8 @@ img,
 .LoginBox button:hover {
   background: var(--Border);
 }
+
+.LoginGuestButton {
+  border-color: var(--Border) !important;
+  color: var(--TextMuted) !important;
+}