Check it before you post it.
Free tools for YouTube, Instagram and TikTok creators. See your thumbnail next to other videos, keep text clear of the app's buttons, and fit every caption to each platform's limits.
Images and videos are processed in your browser. Nothing is uploaded.
All tools, free
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Image
Thumbnail preview
See your thumbnail and title in a mock video feed on desktop and mobile, in the sidebar and in search. Squint and grayscale tests show whether it still reads at a glance.
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Image
Thumbnail resizer
Turn any image into a 16:9 thumbnail at 1280 × 720, 1920 × 1080 or 4K, and compress it under the 2 MB phone upload limit without guessing quality settings.
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Video
Safe zone checker
Lay the button and caption areas of Shorts, Reels and TikTok over your vertical video, so faces and text stay where people can see them.
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Text
Caption length checker
Count characters and hashtags against the limits for YouTube, Instagram, TikTok, X, LinkedIn and Threads, and see exactly where "more" cuts your caption off.
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AI
Caption writer
Describe your post and get three caption options, hashtags and title ideas in English, Hinglish, Hindi and more.
Guides for creators
- YouTube thumbnail size guide for 2026Dimensions, file limits, and designing for small screens.
- Instagram's 5-hashtag limit, explainedWhat changed, what counts, and how to choose your five.
- Safe zones for Shorts, Reels and TikTok: where to put textWhere the buttons cover your video, and one layout that works everywhere.
- Caption and title length limits for every platform (2026)Every limit in one table, plus the cutoff that matters more.
- How to write captions people actually readHooks, keywords, calls to action, and natural Hinglish.