Free Safe Zone Checker & HTML5 Validator

The tool runs entirely in the browser and lets users drag and drop video or image files to visualize platform‑specific safe zones for vertical‑. such as TikTok, Instagram Reels, YouTube Shorts and Snapchat. It overlays a danger zone and a central safe area on the media, indicating where UI elements like like buttons, comment icons, captions and navigation bars may obscure content. The checker supports common formats (MP4, MOV, JPG, PNG, WEBP) and works with any resolution, providing on‑screen dimensions for each platform’s safe area.

It also includes a banner ad validator that applies the same overlay logic to static graphics, helping marketers ensure that logos and text stay within the recommended margins. The interface shows file details such as resolution, duration, frame count, size and format, and all processing occurs locally, keeping the media private.

Designed for marketers and content creators who need to confirm that essential visual elements remain visible across multiple short‑form video platforms, the checker offers a quick, free way to avoid UI obstruction and improve organic reach without uploading files to a server.