What Is Live Preview in a CMS?
IntermediateQuick Answer
TL;DR
Live preview in a CMS updates the content preview in real time as editors type — no manual save or refresh required. The preview pane reflects every keystroke instantly, giving editors immediate visual feedback on how their changes affect the final rendered output. This is especially valuable in headless CMS setups, where the editing interface and frontend are separate systems, because it reconnects editors with the visual context of their content without requiring them to switch between tools.
Key Takeaways
- Live preview updates the rendered preview instantly as editors type, unlike standard preview which requires a manual save or refresh.
- Technical implementations use WebSockets, server-sent events (SSE), or polling to push content changes to the preview pane in real time.
- In headless CMS architectures, live preview requires a dedicated integration between the CMS and the frontend framework.
- Live preview reduces editor errors by providing immediate visual feedback — broken layouts and formatting issues are caught before saving.
- Sanity's Presentation tool, Storyblok's Visual Editor, and Builder.io's visual editor are examples of live preview implementations.