# How to default the WebViewer to the Dark theme

**URL:** <https://pdfjs.community/t/how-to-default-the-webviewer-to-the-dark-theme/1680>\
**Category:** Technical Support\
**Created:** [May 16, 2022, 7:59pm UTC](https://pdfjs.community/t/how-to-default-the-webviewer-to-the-dark-theme/1680 "2022-05-16T19:59:21Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\
**Post date:** [May 16, 2022, 7:59pm UTC](https://pdfjs.community/t/how-to-default-the-webviewer-to-the-dark-theme/1680/3 "2022-05-16T19:59:27Z")

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**Hello, I’m Ron, an automated tech support bot 🤖**

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Saving a document with annotations](https://pdfjs.express/documentation/basic-operations/save-document/save-with-annotations)
- [Saving a document as a blob](https://pdfjs.express/documentation/basic-operations/save-document/blob)
- [Delete a processed file](https://pdfjs.express/documentation/utils/delete)

APIs:
- [UndefinedWebViewer(options, viewerElement)](https://pdfjs.express/api/global.html#WebViewer__anchor)
- [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor)
- [UI.Hotkeys](https://pdfjs.express/api/UI.Hotkeys.html#__anchor)

Forums:
- [Evaluating PDF.Js Express as alternative for PDF.Js](https://pdfjs.community/t/evaluating-pdf-js-express-as-alternative-for-pdf-js/474/6)
- [Error when changing default language](https://pdfjs.community/t/error-when-changing-default-language/1499/1)
- ["PDF.js Express Dev mode" still appearing after valid license](https://pdfjs.community/t/pdf-js-express-dev-mode-still-appearing-after-valid-license/1572/1)

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