diff --git a/internal/templates/generator.html b/internal/templates/generator.html
index 58f978c..ede9951 100644
--- a/internal/templates/generator.html
+++ b/internal/templates/generator.html
@@ -109,6 +109,7 @@
                         <option value="jpeg" {{if eq .FormFormat "jpeg"}}selected{{end}}>JPEG</option>
                         <option value="png" {{if eq .FormFormat "png"}}selected{{end}}>PNG</option>
                         <option value="webp" {{if eq .FormFormat "webp"}}selected{{end}}>WebP</option>
+                        <option value="avif" {{if eq .FormFormat "avif"}}selected{{end}}>AVIF</option>
                         <option value="gif" {{if eq .FormFormat "gif"}}selected{{end}}>GIF</option>
                     </select>
                 </div>