diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0cce8c87..428f4d75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ### Changed
 - (**Theme**) Improve automatic theme background colors
 - (**Theme**) Adjust "primary color" of dynamic color theme on manga pages
+- (**Theme**) Increase max length of custom theme names to 32 (previously 16)
 
 ## [20251230.01] (r2937) - 2025-12-30
 
diff --git a/src/features/theme/components/CreateThemeDialog.tsx b/src/features/theme/components/CreateThemeDialog.tsx
index 24377fdb..63ad5b94 100644
--- a/src/features/theme/components/CreateThemeDialog.tsx
+++ b/src/features/theme/components/CreateThemeDialog.tsx
@@ -179,7 +179,7 @@ export const ThemeCreationDialog = ({
                             onChange={(e) => {
                                 const name = e.target.value.trim();
 
-                                const isValidLength = name.length <= 16;
+                                const isValidLength = name.length <= 32;
                                 const isUnique = isThemeNameUnique(name, customThemes);
                                 setInvalidName(!isValidLength || !isUnique);