CheckSafe.Zone
Free Safe Zone Checker & HTML5 Validator
Free
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About
CheckSafe.Zone is a browser-based tool that helps creators verify whether important visual elements in vertical videos or images fall within platform-safe areas. Social media platforms such as TikTok, Instagram Reels, and YouTube Shorts display interface elements like buttons, captions, and profile information that can cover parts of a video. The tool allows users to upload a video or image and instantly view overlays that mark safe and danger zones specific to each platform. All processing occurs locally in the browser using web APIs, meaning files are not uploaded to external servers. It supports common video and image formats and can export frames with the overlay applied. The primary function is quality control for social media content before publishing.
Problem & solution
Problem
Creators place text in areas hidden by social media UI overlays.
Solution
Uploads media and overlays platform safe zones locally in browser.
Who it's for
Content creators, editors, and social media marketers.
Main features
- Drag-and-drop media check
- Platform safe zone overlays
- Offline browser processing
- Aspect ratio detection
- Frame export with overlay
Use cases
- Check TikTok video text placement
- Validate ad layout before posting
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