How to Use Fullscreen API Test Online (Free)

Fullscreen API Test is a free online browser tool on FileToolsHub. Enter and exit fullscreen on a page element using the Fullscreen API.

Open the live tool at /tool/fullscreen-api-test when you are ready to start. Typical flow: Click Enter fullscreen. View the target box maximized. Exit when finished.

Why people use it: Fullscreen API; Element-scoped; No upload. This tool is designed to run in your browser when possible, so your input stays on your device for private one-off jobs.

Need a follow-up step? Browse more browser tools at /browser, or jump back to the tool page for FAQs, tips, and related utilities linked on FileToolsHub.

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