diff --git a/CHANGELOG.md b/CHANGELOG.md
index 040f046e..10db09f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 Full release narratives now live in versioned files under `releases/`. This file stays as the index and summary entry point.
 
+## [2.10.3] - 2026-05-06
+- EN: This patch adds a best-effort LLM image-input compatibility layer so non-standard input formats can be converted to PNG before provider requests without changing stored assets. See [Release Notes (EN)](releases/v2.10.3.en.md).
+- 中文：本次补丁新增 LLM 输入图片格式兼容层，在不改变已保存素材的前提下，尽力将非标准输入格式转为 PNG 后再请求模型。参见 [版本说明（中文）](releases/v2.10.3.zh-CN.md)。
+
 ## [2.10.2] - 2026-05-06
 - EN: This patch clarifies Prompt Optimizer and Prompt Garden positioning, adds a bilingual Prompt Garden image workflow tutorial, and fixes optional prompt-asset variable handling. See [Release Notes (EN)](releases/v2.10.2.en.md).
 - 中文：本次补丁澄清 Prompt Optimizer 与 Prompt Garden 的产品定位，新增双语 Prompt Garden 图像工作流教程，并修复可选提示词资产变量处理。参见 [版本说明（中文）](releases/v2.10.2.zh-CN.md)。
diff --git a/package.json b/package.json
index 848b959a..82450e5d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "prompt-optimizer",
-  "version": "2.10.2",
+  "version": "2.10.3",
   "private": true,
   "packageManager": "pnpm@10.6.1",
   "engines": {
diff --git a/packages/desktop/package.json b/packages/desktop/package.json
index b0ea5680..a6a03a0c 100644
--- a/packages/desktop/package.json
+++ b/packages/desktop/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@prompt-optimizer/desktop",
-  "version": "2.10.2",
+  "version": "2.10.3",
   "description": "Desktop application for Prompt Optimizer",
   "main": "main.js",
   "repository": {
diff --git a/packages/extension/public/manifest.json b/packages/extension/public/manifest.json
index 3717bb9f..9d5e9d07 100644
--- a/packages/extension/public/manifest.json
+++ b/packages/extension/public/manifest.json
@@ -2,7 +2,7 @@
   "manifest_version": 3,
   "default_locale": "zh_CN",
   "name": "__MSG_extName__",
-  "version": "2.10.2",
+  "version": "2.10.3",
   "description": "__MSG_extDesc__",
   "icons": {
     "16": "icons/icon16.png",
diff --git a/releases/v2.10.3.en.md b/releases/v2.10.3.en.md
new file mode 100644
index 00000000..897bcae1
--- /dev/null
+++ b/releases/v2.10.3.en.md
@@ -0,0 +1,33 @@
+# Prompt Optimizer v2.10.3
+
+## Summary
+- Adds a best-effort compatibility layer for LLM image inputs.
+- Keeps uploaded, stored, favorited, and exported image assets in their original format.
+- Improves Web, Chrome extension, and Electron desktop behavior when providers only accept common image formats.
+
+## Highlights
+- Image-to-image, multi-image generation, and image understanding can now try to normalize non-standard input formats such as WebP to PNG immediately before the provider request.
+
+## Product Updates
+### Core
+- Adds a shared runtime image-input normalizer for image generation and image understanding requests.
+- Treats `image/png` and JPEG inputs as provider-ready, including canonicalizing `image/jpg` to `image/jpeg`.
+- Falls back to the original image whenever conversion is unavailable or fails, so provider errors remain the source of truth.
+
+### Desktop
+- Adds an Electron main-process converter based on `nativeImage` for desktop LLM requests.
+
+## Fixes
+- Non-standard local image MIME types are no longer rejected before the LLM request compatibility layer has a chance to handle them.
+
+## Breaking Changes / Upgrade Notes
+- None.
+
+## Developer Notes
+- The release range is `v2.10.2..50b05a08`.
+- Core unit tests cover image-to-image, multi-image, normal image understanding, and streaming image understanding compatibility paths.
+
+<!-- Release drafting reference:
+- Range: v2.10.2..HEAD
+- fix: normalize LLM image inputs (50b05a08)
+-->
diff --git a/releases/v2.10.3.zh-CN.md b/releases/v2.10.3.zh-CN.md
new file mode 100644
index 00000000..30ea6914
--- /dev/null
+++ b/releases/v2.10.3.zh-CN.md
@@ -0,0 +1,33 @@
+# Prompt Optimizer v2.10.3
+
+## 概括
+- 新增 LLM 输入图片格式的尽力兼容层。
+- 上传、保存、收藏、导入导出的原始图片素材仍保持原格式。
+- 当模型提供商只接受常见图片格式时，改善 Web、Chrome 插件和 Electron 桌面端的请求兼容性。
+
+## 亮点
+- 图生图、多图生图和图像理解现在会在请求模型前，尽力将 WebP 等非标准输入格式规范为 PNG。
+
+## 产品更新
+### Core
+- 新增共享的运行时图片输入 normalizer，覆盖图像生成和图像理解请求。
+- `image/png` 与 JPEG 输入会直接作为模型输入使用，并将 `image/jpg` 规范为 `image/jpeg`。
+- 当当前运行时无法转换或转换失败时，会回退为原始图片，让模型提供商继续返回真实错误。
+
+### Desktop
+- 为 Electron 主进程请求加入基于 `nativeImage` 的转换器。
+
+## 修复
+- 非标准本地图片 MIME 不再在 LLM 请求兼容层处理前被本地校验直接拒绝。
+
+## 破坏性变更 / 升级说明
+- 无。
+
+## 开发者说明
+- 本次发布范围是 `v2.10.2..50b05a08`。
+- Core 单测已覆盖图生图、多图生图、普通图像理解和流式图像理解的兼容路径。
+
+<!-- Release drafting reference:
+- Range: v2.10.2..HEAD
+- fix: normalize LLM image inputs (50b05a08)
+-->