Check your subtitle before you post to Shorts, Reels and TikTok.

Load a local image or video, place your Subtitle, and see if it's clear on all three — nothing leaves your browser.

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Preflight summary

Check the Subtitle against all three demo presets.

Moves the Subtitle, same size, to the nearest spot that's Safe on all three.

Demo presets, not measured platform UI.

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Data

MOCK / DEMO DATA for learning the tool

These are synthetic demo regions, not measured platform UI. For evidence-based results, switch Data to Reference · Organic.

YouTube Shorts

Overlap

Subtitle

Checking demo regions…

Instagram Reels

Overlap

Subtitle

Checking demo regions…

TikTok

Overlap

Subtitle

Checking demo regions…

Now vs. after fix DEMO DATA ONLY
State	Shorts	Reels	TikTok
Now	—	—	—
After fix	Not applied	Not applied	Not applied

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Subtitle

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Focus a Subtitle box. Arrow keys move by 1 unit; Shift moves by 10. Alt + arrows resize. Numeric inputs also support keyboard editing.

Regions

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All three previews with their results, as shown now.

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Platform

1080 × 1920, regions only. Put it on top in CapCut or Premiere and hide it before you export.

Both images are made in your browser and saved to your device. Nothing is sent to a server.

Reading the results

Safe Clear of demo regions

Warning Within the 8px margin

Overlap Intersects a demo region

Frame edges are checked too. Safe is not a guarantee of visibility in a real app.

All three platforms, checked at once
One click to the nearest safer position
Reference data with sources and dates

NAVER Clip · Legacy ratio/crop diagram · Current service awaiting confirmation

Legacy 3:4 → 9:16 ratio diagram (old NaverTV evidence)
Centered example: 12.5% cropped on each side

Legacy source · mode: upload · sourceType: official-rule · confidence: high (per the original document) · evidenceStatus: legacy

This diagram is based on the old NaverTV help center (service/17223), scheduled to shut down on 2026-09-30. It is not the current NAVER Clip production crop rule.

Last verified: not recorded. The same 9:16/3:4 side-crop rule could not be reconfirmed in the current Clip (service/30048) official documentation.

Under the legacy rule (9:16 or 3:4 recommended), a 9:16 input needs no crop by ratio, while a 3:4 input is cropped on the left and right to fit its height.

Example input 1080×1440 → under the legacy rule, the visible source area is 810×1440. Centered alignment is an assumption of this diagram, not a confirmed official crop anchor. It is not claimed to apply to the current service.

구 NaverTV 공식 업로드·비율 규칙(서비스 종료 예정, legacy) — 조사 문서 §0/§6

Current NAVER Clip · evidenceStatus: pending

현재 Clip 공식 문서는 세로형 숏폼 서비스라는 점과 16:9 영상의 '전체 화면으로 보기' 기능만 확인한다. 구 NaverTV의 9:16/3:4 좌우 crop 수치를 동일하게 재확인하지 못했으므로 현재 Clip의 exact crop behavior는 검증 대기(pending)다. 이 preset은 어떤 crop 규칙이나 좌표도 제공하지 않는다.

현재 NAVER Clip 공식 고객센터 — 조사 문서 §0

This is a rule diagram, not a feature that crops or edits your video. NAVER viewer UI safe-zone and collision checks are not provided.