diff --git a/src/config.rs b/src/config.rs
index 696d38d..cfdcb05 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -41,6 +41,8 @@ pub struct CliArgs {
     pub resource_dir: Option<PathBuf>,
     /// Override the user agent
     pub user_agent: Option<String>,
+    /// Initial window's zoom level
+    pub zoom_level: Option<f32>,
 }
 
 /// Configuration of Verso instance.
@@ -130,6 +132,8 @@ fn parse_cli_args() -> Result<CliArgs, getopts::Fail> {
         "Launch the initial window without maximized",
     );
 
+    opts.optopt("", "zoom", "Initial window's zoom level", "1.5");
+
     let matches: getopts::Matches = opts.parse(&args[1..])?;
     let url = matches
         .opt_str("url")
@@ -219,6 +223,11 @@ fn parse_cli_args() -> Result<CliArgs, getopts::Fail> {
         window_attributes = window_attributes.with_maximized(true);
     }
 
+    let zoom_level = matches.opt_get::<f32>("zoom").unwrap_or_else(|e| {
+        log::error!("Failed to parse zoom command line argument: {e}");
+        None
+    });
+
     Ok(CliArgs {
         url,
         resource_dir,
@@ -228,6 +237,7 @@ fn parse_cli_args() -> Result<CliArgs, getopts::Fail> {
         devtools_port,
         profiler_settings,
         user_agent,
+        zoom_level,
     })
 }
 
diff --git a/src/verso.rs b/src/verso.rs
index 1b4b02c..75e5cb9 100644
--- a/src/verso.rs
+++ b/src/verso.rs
@@ -114,6 +114,7 @@ impl Verso {
             .clone()
             .unwrap_or_else(|| default_user_agent_string().to_string())
             .into();
+        let zoom_level = config.args.zoom_level;
 
         config.init();
         // Reserving a namespace to create TopLevelBrowsingContextId.
@@ -360,7 +361,7 @@ impl Verso {
 
         // The compositor coordinates with the client window to create the final
         // rendered page and display it somewhere.
-        let compositor = IOCompositor::new(
+        let mut compositor = IOCompositor::new(
             window.id(),
             window.size(),
             Scale::new(window.scale_factor() as f32),
@@ -380,6 +381,10 @@ impl Verso {
             opts.debug.convert_mouse_to_touch,
         );
 
+        if let Some(zoom_level) = zoom_level {
+            compositor.on_zoom_window_event(zoom_level, &window);
+        }
+
         if with_panel {
             window.create_panel(&constellation_sender, initial_url);
         } else if let Some(initial_url) = initial_url {