diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 0f803a92..7444d7a0 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- Exported `convertToPng` for extension authors.
+
 ## [0.77.0] - 2026-05-28
 
 ### New Features
diff --git a/packages/coding-agent/src/index.ts b/packages/coding-agent/src/index.ts
index 8627bdcd..97533893 100644
--- a/packages/coding-agent/src/index.ts
+++ b/packages/coding-agent/src/index.ts
@@ -349,6 +349,7 @@ export {
 // Clipboard utilities
 export { copyToClipboard } from "./utils/clipboard.ts";
 export { parseFrontmatter, stripFrontmatter } from "./utils/frontmatter.ts";
+export { convertToPng } from "./utils/image-convert.ts";
 export { formatDimensionNote, type ResizedImage, resizeImage } from "./utils/image-resize.ts";
 // Shell utilities
 export { getShellConfig } from "./utils/shell.ts";