diff --git a/main.go b/main.go
index 96b544f..a4ace56 100644
--- a/main.go
+++ b/main.go
@@ -10,12 +10,28 @@ import (
 	"math/rand"
 	"net/http"
 	"net/url"
+	"path/filepath"
 	"strconv"
 	"strings"
 
 	_ "github.com/mattn/go-sqlite3"
 )
 
+var imageExtensions = map[string]bool{
+	".png":  true,
+	".jpg":  true,
+	".jpeg": true,
+	".gif":  true,
+	".webp": true,
+	".bmp":  true,
+	".avif": true,
+}
+
+func isImageFile(path string) bool {
+	ext := strings.ToLower(filepath.Ext(path))
+	return imageExtensions[ext]
+}
+
 //go:embed templates/*
 var templatesFS embed.FS
 
@@ -23,9 +39,8 @@ var templatesFS embed.FS
 var assetsFS embed.FS
 
 type CoverData struct {
-	Comic  int
-	Path   string
-	Prefix string
+	Comic int
+	Path  string
 }
 
 var (
@@ -84,7 +99,7 @@ func handleRandom(w http.ResponseWriter, r *http.Request) {
 	// If accessing /random without chapter, shuffle and redirect to /random/0
 	if path == "" {
 		query := `
-			select page.id_comic, comic.directory || '/' || page.filename path, page.prefix
+			select page.id_comic, comic.directory || '/' || page.filename path
 			from page
 			join comic on comic.id_comic = page.id_comic
 			where page.number = 0
@@ -99,7 +114,7 @@ func handleRandom(w http.ResponseWriter, r *http.Request) {
 		randomCovers = nil
 		for rows.Next() {
 			var c CoverData
-			if err := rows.Scan(&c.Comic, &c.Path, &c.Prefix); err != nil {
+			if err := rows.Scan(&c.Comic, &c.Path); err != nil {
 				http.Error(w, err.Error(), http.StatusInternalServerError)
 				return
 			}
@@ -140,7 +155,7 @@ func handleRandom(w http.ResponseWriter, r *http.Request) {
 	all := make([]Cover, 0, limit*2)
 	for _, c := range randomCovers[start:end] {
 		var coverUrl string
-		if c.Prefix == "imaginary" {
+		if isImageFile(c.Path) {
 			coverUrl = fmt.Sprintf("%s/smartcrop?width=300&height=370&file=%s", imaginaryURL, url.QueryEscape(c.Path))
 		} else {
 			coverUrl = "/static/" + c.Path
@@ -180,7 +195,7 @@ func handleGallery(w http.ResponseWriter, r *http.Request) {
 	}
 
 	query := `
-		select comic.title, comic.directory || '/' || page.filename, page.prefix
+		select comic.title, comic.directory || '/' || page.filename
 		from page
 		join comic on page.id_comic = comic.id_comic
 		where comic.id_comic = ?
@@ -193,20 +208,15 @@ func handleGallery(w http.ResponseWriter, r *http.Request) {
 	}
 	defer rows.Close()
 
-	type Page struct {
-		Path   string
-		Prefix string
-	}
-
 	var title string
-	var pages []Page
+	var pages []string
 	for rows.Next() {
-		var path, prefix string
-		if err := rows.Scan(&title, &path, &prefix); err != nil {
+		var path string
+		if err := rows.Scan(&title, &path); err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
 		}
-		pages = append(pages, Page{Path: path, Prefix: prefix})
+		pages = append(pages, path)
 	}
 
 	if len(pages) == 0 {
@@ -216,7 +226,7 @@ func handleGallery(w http.ResponseWriter, r *http.Request) {
 
 	data := struct {
 		Title        string
-		Pages        []Page
+		Pages        []string
 		ImaginaryURL string
 	}{title, pages, imaginaryURL}
 
@@ -239,7 +249,7 @@ func handleIndex(w http.ResponseWriter, r *http.Request) {
 	offset := chapter * limit
 
 	query := `
-        select page.id_comic, comic.directory || '/' || page.filename path, page.prefix
+        select page.id_comic, comic.directory || '/' || page.filename path
         from page
         join comic on comic.id_comic = page.id_comic
         where page.number = 0
@@ -262,13 +272,13 @@ func handleIndex(w http.ResponseWriter, r *http.Request) {
 	all := make([]Cover, 0, limit*2)
 	for rows.Next() {
 		var comic int
-		var path, prefix string
-		if err := rows.Scan(&comic, &path, &prefix); err != nil {
+		var path string
+		if err := rows.Scan(&comic, &path); err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
 		}
 		var coverUrl string
-		if prefix == "imaginary" {
+		if isImageFile(path) {
 			coverUrl = fmt.Sprintf("%s/smartcrop?width=300&height=370&file=%s", imaginaryURL, url.QueryEscape(path))
 		} else {
 			coverUrl = "/static/" + path
diff --git a/templates/gallery.html b/templates/gallery.html
index acd9dbb..36892f2 100644
--- a/templates/gallery.html
+++ b/templates/gallery.html
@@ -31,15 +31,20 @@
             width: 1080,
             height: 1920,
             imaginary: '{{.ImaginaryURL}}',
-            pages: [{{range $i, $p := .Pages}}{{if $i}},{{end}}{path: '{{$p.Path}}', prefix: '{{$p.Prefix}}'}{{end}}],
+            pages: [{{range $i, $p := .Pages}}{{if $i}},{{end}}'{{$p}}'{{end}}],
             urls: [],
             prefetched: new Set(),
+            imageExts: ['.png', '.jpg', '.jpeg', '.gif', '.webp', '.bmp', '.avif'],
+            isImage(path) {
+                const ext = path.substring(path.lastIndexOf('.')).toLowerCase();
+                return this.imageExts.includes(ext);
+            },
             buildUrls() {
                 this.urls = this.pages.map(p => {
-                    if (p.prefix === 'imaginary') {
-                        return this.imaginary + '/fit?width=' + this.width + '&height=' + this.height + '&file=' + encodeURIComponent(p.path);
+                    if (this.isImage(p)) {
+                        return this.imaginary + '/fit?width=' + this.width + '&height=' + this.height + '&file=' + encodeURIComponent(p);
                     }
-                    return '/static/' + p.path;
+                    return '/static/' + p;
                 });
                 this.prefetched.clear();
             },