diff --git a/.gitignore b/.gitignore
index e9651fc..2a63933 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,8 @@ result
 # demo/ directory acts as a playground/sandbox, and real git repositories sits there.
 demo/*
 !demo/config.yaml
+!demo/robots.txt
+!demo/robots.txt.license
 
 # QEMU disk image.
 *.qcow2
diff --git a/config.yaml b/config.yaml
index 84611c5..1c59a90 100644
--- a/config.yaml
+++ b/config.yaml
@@ -84,6 +84,10 @@ meta:
   # NOTE: This applies only to blob page. Code blocks inside README will be untouched.
   syntaxHighlight: true
 
+  # Path to a text file to return for "/robots.txt" requests.
+  # Omit this option or set empty string to return HTTP 404.
+  robotsTxt: ./path/to/robots.txt
+
 ui:
   # Number of commits to display in a single "Commits" (log) page.
   commitsPageSize: 30
diff --git a/config/config.go b/config/config.go
index 8426189..4423fb3 100644
--- a/config/config.go
+++ b/config/config.go
@@ -35,6 +35,7 @@ type Config struct {
 		Title           string `yaml:"title"`
 		Description     string `yaml:"description"`
 		SyntaxHighlight bool   `yaml:"syntaxHighlight"`
+		RobotsTxt       string `yaml:"robotsTxt"`
 	} `yaml:"meta"`
 	UI struct {
 		CommitsPageSize uint32 `yaml:"commitsPageSize"`
@@ -137,6 +138,12 @@ func (c *Config) Resolve(cwd string) error {
 		}
 	}
 
+	if c.Meta.RobotsTxt != "" {
+		if c.Meta.RobotsTxt, err = resolvePath(c.Meta.RobotsTxt, basePath); err != nil {
+			return err
+		}
+	}
+
 	if c.UI.CommitsPageSize == 0 {
 		c.UI.CommitsPageSize = 30
 	}
diff --git a/core/core.go b/core/core.go
index 8934c36..3387d9e 100644
--- a/core/core.go
+++ b/core/core.go
@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"html/template"
+	"io"
 	"io/fs"
 	"os"
 	"path/filepath"
@@ -42,6 +43,8 @@ type Core struct {
 	// t stores compiled templates for caching.
 	tmpl         *template.Template
 	templatesDir fs.FS
+
+	robotsTxt string
 }
 
 func New(config *config.Config) (*Core, error) {
@@ -81,6 +84,21 @@ func New(config *config.Config) (*Core, error) {
 		return nil, fmt.Errorf("unable to open scan dir: %w", err)
 	}
 
+	if config.Meta.RobotsTxt != "" {
+		file, err := os.Open(config.Meta.RobotsTxt)
+		if err != nil {
+			return nil, fmt.Errorf("unable to open robots.txt: %w", err)
+		}
+		defer file.Close()
+
+		contents, err := io.ReadAll(file)
+		if err != nil {
+			return nil, fmt.Errorf("unable to read robots.txt (%s): %w", config.Meta.RobotsTxt, err)
+		}
+
+		core.robotsTxt = string(contents)
+	}
+
 	return &core, nil
 }
 
@@ -120,3 +138,11 @@ func (core *Core) RepositoryPath(name string) (string, error) {
 func (_ *Core) RepositoryName(path string) string {
 	return strings.TrimSuffix(filepath.Base(path), ".git")
 }
+
+func (c *Core) RobotsTxt() io.Reader {
+	if c.Config.Meta.RobotsTxt == "" {
+		return nil
+	}
+
+	return strings.NewReader(c.robotsTxt)
+}
diff --git a/demo/config.yaml b/demo/config.yaml
index 92db552..72f68d0 100644
--- a/demo/config.yaml
+++ b/demo/config.yaml
@@ -37,6 +37,7 @@ meta:
   title: legit Demo
   description: Test legit features with real repositories.
   syntaxHighlight: true
+  robotsTxt: ./robots.txt
 
 ui:
   category:
diff --git a/demo/robots.txt b/demo/robots.txt
new file mode 100644
index 0000000..781c124
--- /dev/null
+++ b/demo/robots.txt
@@ -0,0 +1,3 @@
+# Demo server for legit, web frontend for git. URLs are not permanent.
+User-Agent: *
+Disallow: /
diff --git a/demo/robots.txt.license b/demo/robots.txt.license
new file mode 100644
index 0000000..08ef583
--- /dev/null
+++ b/demo/robots.txt.license
@@ -0,0 +1,2 @@
+Copyright 2026 Shota FUJI <pockawoooh@gmail.com>
+SPDX-License-Identifier: MIT
diff --git a/main.go b/main.go
index 272fb19..55eade3 100644
--- a/main.go
+++ b/main.go
@@ -92,7 +92,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	fsAllowList := make([]filesystemAccess, 2, 10)
+	fsAllowList := make([]filesystemAccess, 2, 11)
 	fsAllowList[0] = filesystemAccess{
 		path:  c.Repo.ScanPath,
 		isDir: true,
@@ -119,6 +119,13 @@ func main() {
 		})
 	}
 
+	if c.Meta.RobotsTxt != "" {
+		fsAllowList = append(fsAllowList, filesystemAccess{
+			path: c.Meta.RobotsTxt,
+			read: true,
+		})
+	}
+
 	if c.Dirs.Static != "" {
 		fsAllowList = append(fsAllowList, filesystemAccess{
 			path:  c.Dirs.Static,
diff --git a/pages/pages.go b/pages/pages.go
index 6231c80..5fc0c1c 100644
--- a/pages/pages.go
+++ b/pages/pages.go
@@ -4,6 +4,7 @@
 package pages
 
 import (
+	"io"
 	"net/http"
 	"path"
 	"strings"
@@ -36,6 +37,19 @@ func (pages *Pages) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if strings.TrimPrefix(r.URL.Path, "/") == "robots.txt" {
+		reader := pages.core.RobotsTxt()
+		if reader == nil {
+			errors.WriteNotFound(pages.core, w, r)
+			return
+		}
+
+		w.Header().Add("Content-Type", "text/plain")
+		w.WriteHeader(http.StatusOK)
+		io.Copy(w, reader)
+		return
+	}
+
 	if strings.HasSuffix(r.URL.Path, "/") {
 		r.URL.Path = strings.TrimRight(r.URL.Path, "/")
 		w.Header().Add("Location", r.URL.String())