diff --git a/cspell.jsonc b/cspell.jsonc
index d5c622c..5345052 100644
--- a/cspell.jsonc
+++ b/cspell.jsonc
@@ -21,6 +21,7 @@
     "tauri",
     "thiserror",
     "Unhide",
+    "unlisten",
     "unoptimized",
     "walkdir",
     "Warhammer",
diff --git a/frontend/src/components/form.tsx b/frontend/src/components/form.tsx
index 326e20c..ff39e89 100644
--- a/frontend/src/components/form.tsx
+++ b/frontend/src/components/form.tsx
@@ -10,6 +10,7 @@ import Checkbox from "@mui/material/Checkbox";
 import ClearAllIcon from "@mui/icons-material/ClearAll";
 import ConvertButton from "./buttons/convert_btn";
 import Grid from "@mui/material/Unstable_Grid2";
+import SlideshowIcon from "@mui/icons-material/Slideshow";
 import VisibilityOffIcon from "@mui/icons-material/VisibilityOff";
 import toast from "react-hot-toast";
 import type { SubmitHandler } from "react-hook-form";
@@ -23,6 +24,8 @@ import {
 } from "@/components/lists/select_log_level";
 import { SelectPathButton } from "@/components/buttons/path_selector";
 import { UnhideDarBtn } from "@/components/buttons/unhide_dar_btn";
+import { listen } from "@tauri-apps/api/event";
+import LinearWithValueLabel from "./progress_bar";
 
 type FormProps = {
   src: string;
@@ -35,6 +38,8 @@ type FormProps = {
   logLevel: LogLevel;
   runParallel: boolean;
   hideDar: boolean;
+  showProgress: boolean;
+  progress: number;
 };
 
 export function ConvertForm() {
@@ -49,10 +54,12 @@ export function ConvertForm() {
       modAuthor: localStorage.getItem("modAuthor") ?? "",
       mappingPath: localStorage.getItem("mappingPath") ?? "",
       mapping1personPath: localStorage.getItem("mapping1personPath") ?? "",
-      runParallel: localStorage.getItem("runParallel") === "true",
-      hideDar: localStorage.getItem("hideDar") === "true",
       loading: false as boolean,
       logLevel: selectLogLevel(localStorage.getItem("logLevel") ?? "error"),
+      runParallel: localStorage.getItem("runParallel") === "true",
+      hideDar: localStorage.getItem("hideDar") === "true",
+      showProgress: localStorage.getItem("showProgress") === "true",
+      progress: 0,
     } satisfies FormProps,
   });
 
@@ -85,10 +92,25 @@ export function ConvertForm() {
     mapping1personPath,
     runParallel,
     hideDar,
+    showProgress,
   }) => {
     setLoading(true);
 
+    let unlisten: (() => void) | null = null;
     try {
+      setValue("progress", 0);
+      let maxNum = 0;
+      let prog = 0;
+
+      unlisten = await listen<{ index: number }>("show-progress", (event) => {
+        if (maxNum === 0) {
+          maxNum = event.payload.index;
+        } else {
+          prog = event.payload.index;
+        }
+        setValue("progress", (prog * 100) / maxNum);
+      });
+
       const completeInfo = await convertDar2oar({
         src,
         dist,
@@ -98,11 +120,16 @@ export function ConvertForm() {
         mapping1personPath,
         runParallel,
         hideDar,
+        showProgress,
       });
       toast.success(completeInfo);
+      setValue("progress", 100);
     } catch (err) {
       toast.error(`${err}`);
     } finally {
+      if (unlisten) {
+        unlisten();
+      }
       setLoading(false);
     }
   };
@@ -349,33 +376,37 @@ export function ConvertForm() {
         <Grid container spacing={2}>
           <Grid xs={3}>
             <Controller
-              name="runParallel"
+              name="showProgress"
               control={control}
               render={({ field: { value } }) => (
                 <Tooltip
                   title={
-                    <p>
-                      Use multi-threading.
-                      <br />
-                      In most cases, it slows down by tens of ms, but may be
-                      effective when there is more weight on CPU processing with
-                      fewer files to copy and more logic parsing of
-                      &quot;_condition.txt&quot;
-                    </p>
+                    <>
+                      <p>Display detail progress</p>
+                      <p>
+                        However, conversion may be delayed by 5~10 seconds or
+                        more.
+                      </p>
+                    </>
                   }
                 >
                   <FormControlLabel
                     control={
                       <Checkbox
                         onClick={() => {
-                          localStorage.setItem("runParallel", `${!value}`);
-                          setValue("runParallel", !value);
+                          setValue("showProgress", !value);
+                          localStorage.setItem("showProgress", `${!value}`);
                         }}
                         checked={value}
-                        aria-label="Run Parallel"
+                        aria-label="Show Progress"
                       />
                     }
-                    label="Run Parallel"
+                    label={
+                      <Box component="div" sx={{ display: "flex" }}>
+                        <SlideshowIcon />
+                        ProgressBar
+                      </Box>
+                    }
                   />
                 </Tooltip>
               )}
@@ -403,6 +434,7 @@ export function ConvertForm() {
                       <Checkbox
                         onClick={() => {
                           localStorage.setItem("hideDar", `${!value}`);
+                          setValue("hideDar", !value);
                         }}
                         checked={value}
                         aria-label="Hide DAR"
@@ -431,14 +463,51 @@ export function ConvertForm() {
           </Grid>
         </Grid>
 
-        <Grid xs={3}>
-          <Controller
-            name="logLevel"
-            control={control}
-            render={({ field: { value } }) => (
-              <SelectLogLevel value={value} {...register("logLevel")} />
-            )}
-          />
+        <Grid container spacing={2}>
+          <Grid xs={3}>
+            <Controller
+              name="runParallel"
+              control={control}
+              render={({ field: { value } }) => (
+                <Tooltip
+                  title={
+                    <p>
+                      Use multi-threading.
+                      <br />
+                      In most cases, it slows down by tens of ms, but may be
+                      effective when there is more weight on CPU processing with
+                      fewer files to copy and more logic parsing of
+                      &quot;_condition.txt&quot;
+                    </p>
+                  }
+                >
+                  <FormControlLabel
+                    control={
+                      <Checkbox
+                        onClick={() => {
+                          localStorage.setItem("runParallel", `${!value}`);
+                          setValue("runParallel", !value);
+                        }}
+                        checked={value}
+                        aria-label="Run Parallel"
+                      />
+                    }
+                    label="Run Parallel"
+                  />
+                </Tooltip>
+              )}
+            />
+          </Grid>
+
+          <Grid xs={3}>
+            <Controller
+              name="logLevel"
+              control={control}
+              render={({ field: { value } }) => (
+                <SelectLogLevel value={value} {...register("logLevel")} />
+              )}
+            />
+          </Grid>
         </Grid>
 
         <Controller
@@ -450,6 +519,14 @@ export function ConvertForm() {
             </Box>
           )}
         />
+
+        <Controller
+          name="progress"
+          control={control}
+          render={({ field: { value } }) => (
+            <LinearWithValueLabel progress={value} />
+          )}
+        />
       </FormGroup>
     </Grid>
   );
diff --git a/frontend/src/components/progress_bar.tsx b/frontend/src/components/progress_bar.tsx
new file mode 100644
index 0000000..8276924
--- /dev/null
+++ b/frontend/src/components/progress_bar.tsx
@@ -0,0 +1,35 @@
+import * as React from "react";
+import LinearProgress, {
+  LinearProgressProps,
+} from "@mui/material/LinearProgress";
+import Typography from "@mui/material/Typography";
+import Box from "@mui/material/Box";
+
+function LinearProgressWithLabel(
+  props: LinearProgressProps & { value: number },
+) {
+  return (
+    <Box sx={{ display: "flex", alignItems: "center" }}>
+      <Box sx={{ width: "100%", mr: 1 }}>
+        <LinearProgress variant="determinate" {...props} />
+      </Box>
+      <Box sx={{ minWidth: 35 }}>
+        <Typography variant="body2" color="text.secondary">{`${Math.round(
+          props.value,
+        )}%`}</Typography>
+      </Box>
+    </Box>
+  );
+}
+
+type Props = {
+  progress: number;
+};
+
+export default function LinearWithValueLabel({ progress }: Readonly<Props>) {
+  return (
+    <Box sx={{ width: "100%" }}>
+      <LinearProgressWithLabel value={progress} />
+    </Box>
+  );
+}
diff --git a/frontend/src/tauri_cmd/index.ts b/frontend/src/tauri_cmd/index.ts
index 9db7dcd..d978db1 100644
--- a/frontend/src/tauri_cmd/index.ts
+++ b/frontend/src/tauri_cmd/index.ts
@@ -2,6 +2,7 @@ import { invoke } from "@tauri-apps/api";
 import { open } from "@tauri-apps/api/dialog";
 import { appLogDir } from "@tauri-apps/api/path";
 import { open as openShell } from "@tauri-apps/api/shell";
+import { selectLogLevel } from "@/components/lists/select_log_level";
 
 export type LogLevel = "trace" | "debug" | "info" | "warn" | "error";
 
@@ -14,6 +15,7 @@ type ConverterArgs = {
   mapping1personPath?: string;
   runParallel?: boolean;
   hideDar?: boolean;
+  showProgress?: boolean;
 };
 
 /**
@@ -21,28 +23,29 @@ type ConverterArgs = {
  * # Throw Error
  */
 export async function convertDar2oar(props: ConverterArgs): Promise<string> {
-  const darDir = props.src === "" ? undefined : props.src;
-  const oarDir = props.dist === "" ? undefined : props.dist;
-  const modName = props.modName === "" ? undefined : props.modName;
-  const modAuthor = props.modAuthor === "" ? undefined : props.modAuthor;
-  const mapping1personPath =
-    props.mapping1personPath === "" ? undefined : props.mapping1personPath;
-  const mappingPath = props.mappingPath === "" ? undefined : props.mappingPath;
-  const runParallel = props.runParallel ?? false;
-  const hideDar = props.hideDar ?? false;
-
-  return invoke<string>("convert_dar2oar", {
+  const args = {
     options: {
-      darDir,
-      oarDir,
-      modName,
-      modAuthor,
-      mappingPath,
-      mapping1personPath,
-      runParallel,
-      hideDar,
+      darDir: props.src === "" ? undefined : props.src,
+      oarDir: props.dist === "" ? undefined : props.dist,
+      modName: props.modName === "" ? undefined : props.modName,
+      modAuthor: props.modAuthor === "" ? undefined : props.modAuthor,
+      mappingPath: props.mappingPath === "" ? undefined : props.mappingPath,
+      mapping1personPath:
+        props.mapping1personPath === "" ? undefined : props.mapping1personPath,
+      runParallel: props.runParallel ?? false,
+      hideDar: props.hideDar ?? false,
     },
-  });
+  };
+
+  let logLevel = selectLogLevel(localStorage.getItem("logLevel") ?? "");
+  changeLogLevel(logLevel);
+
+  const showProgress = props.showProgress ?? false;
+  if (showProgress) {
+    return invoke<string>("convert_dar2oar_with_progress", args);
+  } else {
+    return invoke<string>("convert_dar2oar", args);
+  }
 }
 
 export async function changeLogLevel(logLevel?: LogLevel): Promise<void> {
diff --git a/frontend/src/utils/styles.ts b/frontend/src/utils/styles.ts
index 4ced4eb..df4b53e 100644
--- a/frontend/src/utils/styles.ts
+++ b/frontend/src/utils/styles.ts
@@ -52,6 +52,10 @@ label.Mui-focused {
 
 .MuiLoadingButton-root:hover {
   background-color: var(--hover-convert-btn-color);
+}
+
+.MuiLinearProgress-bar {
+  background-color: var(--theme-color);
 }`;
 }
 
diff --git a/src-tauri/src/cmd.rs b/src-tauri/src/cmd.rs
index 109fea9..aeeb43a 100644
--- a/src-tauri/src/cmd.rs
+++ b/src-tauri/src/cmd.rs
@@ -3,6 +3,7 @@ use dar2oar_core::{
     convert_dar_to_oar,
     fs::{async_closure::AsyncClosure, parallel, remove_oar, unhide_dar, ConvertOptions},
 };
+use tauri::Window;
 
 /// early return with Err() and write log error.
 macro_rules! bail {
@@ -31,6 +32,39 @@ pub(crate) async fn convert_dar2oar(options: GuiConverterOptions<'_>) -> Result<
     }
 }
 
+#[tauri::command]
+pub(crate) async fn convert_dar2oar_with_progress(
+    window: Window,
+    options: GuiConverterOptions<'_>,
+) -> Result<String, String> {
+    tracing::debug!("options: {:?}", &options);
+    let run_parallel = options.run_parallel.unwrap_or_default();
+
+    #[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+    struct Payload {
+        index: usize,
+    }
+    let sender = move |index: usize| {
+        if let Err(err) = window.emit("show-progress", Payload { index }) {
+            tracing::error!("{}", err);
+        };
+        async move {}
+    };
+
+    let config = ConvertOptions::async_from(options).await;
+    let res = match run_parallel {
+        true => parallel::convert_dar_to_oar(config, sender).await,
+        false => convert_dar_to_oar(config, sender).await,
+    };
+    match res {
+        Ok(complete_msg) => {
+            tracing::info!("{}", complete_msg);
+            Ok(complete_msg.to_string())
+        }
+        Err(err) => bail!(err),
+    }
+}
+
 #[tauri::command]
 pub(crate) async fn change_log_level(log_level: Option<&str>) -> Result<(), String> {
     tracing::debug!("Selected log level: {:?}", log_level);
diff --git a/src-tauri/src/convert_option.rs b/src-tauri/src/convert_option.rs
index 0d4efde..99b4ff7 100644
--- a/src-tauri/src/convert_option.rs
+++ b/src-tauri/src/convert_option.rs
@@ -13,6 +13,7 @@ pub(crate) struct GuiConverterOptions<'a> {
     pub(crate) mapping_1person_path: Option<&'a str>,
     pub(crate) run_parallel: Option<bool>,
     pub(crate) hide_dar: Option<bool>,
+    pub(crate) show_progress: Option<bool>,
 }
 
 #[async_trait::async_trait]
@@ -32,6 +33,7 @@ impl<'a> AsyncFrom<GuiConverterOptions<'a>> for ConvertOptions<'a, &'a str> {
             mapping_1person_path,
             run_parallel: _,
             hide_dar,
+            show_progress: _,
         } = options;
 
         let oar_dir = oar_dir.and_then(|dist| match dist.is_empty() {
diff --git a/src-tauri/src/runner.rs b/src-tauri/src/runner.rs
index 51083e0..c84a015 100644
--- a/src-tauri/src/runner.rs
+++ b/src-tauri/src/runner.rs
@@ -12,6 +12,7 @@ pub fn run_tauri() -> anyhow::Result<()> {
         .invoke_handler(tauri::generate_handler![
             crate::cmd::change_log_level,
             crate::cmd::convert_dar2oar,
+            crate::cmd::convert_dar2oar_with_progress,
             crate::cmd::remove_oar_dir,
             crate::cmd::restore_dar_dir,
         ])
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index e40617a..1c94dfd 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -73,7 +73,7 @@
     "windows": [
       {
         "fullscreen": false,
-        "height": 880,
+        "height": 900,
         "resizable": true,
         "theme": "Dark",
         "title": "DAR to OAR Converter",