A safe-zone checker overlays the real TikTok, Instagram Reels, or YouTube Shorts interface on top of your video so you can see — before you publish — whether the username, caption, sound row, or the right-side like/comment/share buttons are covering your captions or hook. This is the fix for the common problem of captions getting hidden behind platform UI or cropped out of the feed thumbnail.
This article ranks the best free safe-zone checkers in 2026. We make one of them (Post Preview), so this is not a neutral review — each section below names where a competitor genuinely beats us, and our tool is not the privacy pick. If you just want the honest short answer, it’s in the TL;DR.
TL;DR — Free safe-zone checkers at a glance
| Tool | Free | No sign-up | No upload (private) | TikTok / Reels / Shorts | Best for |
|---|---|---|---|---|---|
| CheckSafe.Zone | Yes | Yes | Yes (client-side) | All three | Privacy — nothing leaves your browser |
| Kreatli | Yes | Yes | Uploads | All three | Clean general-purpose overlay |
| AICarousels | Yes | Yes | Uploads | All three | Downloadable template overlay |
| PostPlanify | Yes | Yes | Client-side | All three | Overlay kept current with UI changes |
| Reel Video Captions — Post Preview | Yes | Yes | Uploads (server-side) | All three | Checking a clip you’re also captioning |
Caveat: free tiers and privacy models change. We checked these in May 2026 against each tool’s site — we’ll re-verify quarterly.
A note on bias
We make Post Preview. For the narrow job of “is my caption inside the safe zone,” a 100% client-side tool like CheckSafe.Zone is the better answer for most people, because it never uploads your footage. Post Preview’s advantage is different: it renders the actual platform UI plus the feed-thumbnail crop and is built to pair with caption burn-in. We rank honestly below.
1. CheckSafe.Zone — the privacy pick
CheckSafe.Zone runs entirely in your browser. Your video file never leaves your device — there is no upload and no account. It overlays TikTok, Instagram Reels, and YouTube Shorts UI on a vertical clip so you can confirm captions and key visuals sit in the safe zone.
Best for: anyone who does not want raw footage on someone else’s server. For a quick pre-post check, this is the honest default recommendation. Where it’s limited: it is a checker only — it does not caption, crop, or export a corrected video.
2. Kreatli — best general-purpose overlay
Kreatli offers a free, no-sign-up safe-zone checker covering all three platforms with a clean overlay. It is part of a broader creator suite, so expect prompts toward the paid product, but the free checker works on its own.
Best for: a polished overlay without creating an account. Where it beats us: broader template/dimension references in one place.
3. AICarousels — downloadable template overlay
AICarousels’ checker is free and requires no sign-up, and it auto-loads a safe-zone template you can download as an overlay to use inside your editor.
Best for: creators who want a reusable PNG/template overlay to design against, not just a one-time preview.
4. PostPlanify — overlay kept current
PostPlanify’s safe-zone checker is free, no-sign-up, and processes in the browser. Its differentiator is that the overlay is updated to track TikTok/Reels interface changes — useful because platform UI shifts and a stale overlay gives false confidence.
Best for: when you want the overlay to reflect the current app, not last year’s layout.
5. Reel Video Captions — Post Preview
Post Preview shows your video inside the real TikTok, Reels, and Shorts interface — username, caption, sound row, right-side action rail — and the tighter feed-thumbnail crop each platform applies. It is free, no sign-up, no watermark.
Where it loses: it uploads your clip server-side (it shares the captioning pipeline), so if “nothing leaves my browser” is your priority, use CheckSafe.Zone instead. Where it wins: if you are captioning the clip anyway, Post Preview checks the safe zone against the real UI and the thumbnail crop in the same flow, instead of being a separate disconnected step.
What is the TikTok / Reels safe zone, in numbers?
Vertical video is 1080×1920. The unsafe areas are roughly:
- Top band (~150–200 px): username and sound label.
- Right rail (~120 px wide): like, comment, share, bookmark icons.
- Bottom band (~250–300 px): caption, CTA, and the “Add comment” bar.
Practical rule: keep captions, faces, logos, and CTAs out of the bottom ~15% and away from the far-right column. The center band is safe on every device. These are approximate and shift with app updates and device size — which is why an overlay against the current UI beats memorizing fixed margins.
Which one should you actually pick?
- Just want a fast, private check: CheckSafe.Zone.
- Want a reusable template to design against: AICarousels.
- Want the overlay to match the current app: PostPlanify.
- You’re already burning captions into the clip: Post Preview, so the safe-zone check and the thumbnail-crop check happen in the same flow.
For most creators the free, no-sign-up tools are entirely sufficient. Paid tiers only make sense for agencies that need approval workflows.
FAQ
What is the best free TikTok safe zone checker?
For a quick, private check, CheckSafe.Zone is the best free TikTok safe-zone checker for most creators because it runs entirely in your browser with no upload and no sign-up. If you are also captioning the clip, Post Preview checks the safe zone against the real TikTok UI and the feed-thumbnail crop in the same flow.
Do safe zone checkers upload your video?
It depends on the tool. Client-side checkers like CheckSafe.Zone and PostPlanify process the video in your browser, so nothing is uploaded. Others, including Post Preview, upload the clip to a server. If keeping raw footage off third-party servers matters to you, choose a client-side, no-upload checker.
Is there a free Instagram Reels safe zone checker with no sign-up?
Yes. CheckSafe.Zone, Kreatli, AICarousels, PostPlanify, and Post Preview all check Instagram Reels safe zones for free with no sign-up. They overlay the Reels interface — username, caption, audio row, and right-side buttons — so you can confirm nothing important is covered before posting.
Why are my captions cut off or covered on TikTok?
Captions get covered when they sit in the bottom third or far-right of the frame, where TikTok overlays the username, caption, sound, and the like/comment/share buttons during playback. The video itself is unchanged — the platform UI sits on top of it. A safe-zone checker shows this collision before you publish so you can reposition the captions instead of deleting and re-uploading.
Do I need a safe zone checker if I already use a caption tool?
Yes, because most caption tools do not show the platform UI or the feed-thumbnail crop. A caption can look perfectly placed in an editor and still end up behind the like button once the clip is live. Checking against the real interface is a separate step — or, with Post Preview, the same step.