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Check a Reels, TikTok or Shorts frame before you post it

Drop a still or a video into Safe Zone Checker, pick an app, and see where its buttons, captions and progress bar land on your 9:16 frame. Text that sits under the UI gets a red box, so you can move it before you post.

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One HTML file that runs offline in your browser. Free.

Safe Zone Checker: Free Offline Tool to Test Reels, TikTok and Shorts Frames

What Safe Zone Checker does

  • 9 zones

    Instagram Reels, Facebook Reels, TikTok, YouTube Shorts, Snapchat Spotlight, LinkedIn and Pinterest, plus Safe everywhere, which clears all of them, and one zone for Reels, TikTok and Shorts together.

  • Text check

    Marks sharp, high-contrast detail inside an app's UI area, with low, medium and high sensitivity.

  • Frames and video

    PNG, JPG and WebP stills, or scrub through an MP4 or WebM clip (MOV when your browser can play it).

  • Grid crops

    3:4, 4:5 and 1:1 lines for covers.

  • Export

    Save the frame with the overlay as a 1080x1920 PNG for a client or a teammate.

  • Private by design

    Your frames and videos stay on your computer and nothing is uploaded.

Who it is for

  • Creators who want to check a frame before they post it
  • Editors who send clients a frame with the safe zone drawn on it
  • Anyone whose captions have ended up under the Like button

Details

Apps
7 apps plus 2 combined zones
Opens
PNG, JPG and WebP frames, MP4 and WebM video
Saves
The frame with the overlay as a 1080x1920 PNG
Runs
Offline in your browser, nothing is uploaded
Also inside
Safe everywhere overlay PNG at 1080x1920
Price
Free, or pay what you want

How it works

  1. 1

    Get it on Gumroad: type 0 as the price at checkout.

  2. 2

    Unzip it and open Safe Zone Checker.html. Drop a frame or a video onto the page.

  3. 3

    Pick the app you post to, or Safe everywhere.

  4. 4

    Move any text with a red box inside the white outline, then check again.

Questions

Is it really free?

Yes. Enter 0 at checkout. If it helps you, you can pay what you like.

Does it work offline?

Yes. Open the file in Chrome, Edge or another modern browser, with or without internet.

Why did it mark something that is not text?

The check looks for sharp, high-contrast detail, so busy patterns like leaves or fences can trigger it. Lower the sensitivity or judge the frame yourself.

Where do the numbers come from?

From each platform's own help pages and template files, checked in October 2026: Meta's Reels specs for Instagram and Facebook, TikTok's In-Feed safe zone file, Google's YouTube vertical overlay, Snap's creative best practices and Pinterest's Video Pin specs. Snapchat prints no side margins and LinkedIn prints no numbers at all, so those zones use careful margins of our own, and the guide says so.

Can I get the overlays for my editor?

Safe Zone Overlays has all 9 zones and 3 grid crops as transparent PNGs in 1080x1920 and 4K, a one-page cheat sheet and steps for Premiere Pro, DaVinci Resolve, Final Cut Pro, CapCut and Canva.

Get Safe Zone Checker

Free Offline Tool to Test Reels, TikTok and Shorts Frames

Need help after you buy? Reply to your receipt email and describe what happened. We will help you get it running.

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