Best AI video caption generator for YouTube: four tools by video length

Best AI video caption generator for YouTube: the short answer

For YouTube Shorts, the best AI video caption generator in this table is Submagic Starter: $12 a month per member, billed yearly, as read on 5 October 2026, for 15 videos a month of up to 2 minutes each. For long YouTube videos pick Kapwing Pro, $16 per member a month, billed annually, which subtitles up to 1,000 minutes a month.

YouTube Shorts: Submagic Starter and its 2-minute limit

Submagic's home page says its exports are optimized for TikTok, Reels and Shorts. Starter is $12 a month per member, billed yearly, or $19 billed monthly, with AI auto captions on 15 videos a month of up to 2 minutes each. Pro, $23 a month per member billed yearly, takes videos of up to 5 minutes, adds AI removal of silences and bad takes and publishes to YouTube, with one profile per platform.

For a first test, Submagic's free trial covers three short videos with no credit card, and downloads carry a watermark until you subscribe.

Long YouTube videos: Kapwing, Descript and Submagic Business

Kapwing Pro subtitles up to 1,000 minutes a month, and its Free plan up to 10 minutes. Descript Hobbyist includes 10 media hours a month and Creator includes 30. Vizard counts credits, 600 a month at the opening choice of its credit selector, and one credit is one minute of video. Descript lists dynamic captions, and Vizard's subtitle-tool page says it adds animated subtitles automatically.

Of Submagic's three priced plans, only Business takes a 30-minute video, at $41 a month per member, billed yearly. A coach who posts a 30-minute webinar recording to YouTube needs Submagic Business, since Starter stops at 2 minutes and Pro at 5. Kapwing counts subtitles in minutes a month, so a webinar recording uses part of that allowance. Compare the two on Submagic vs Kapwing.

Export quality for YouTube: 1080p, 4K and 60 FPS by plan

Submagic exports 1080p at 30 FPS on Starter and 4K at 60 FPS on Business. Pro export is listed as 1080p in one place on Submagic's pricing page and as 1080p or 2K in another, so confirm it at checkout. Kapwing Pro and Vizard Creator export 4K. Descript exports 1080p on Hobbyist and 4k on Creator.

Prices of the four on yearly billing

On yearly billing Kapwing Pro and Descript Hobbyist are both $16, one per member and one per person, while Vizard Creator is $14.5 at 600 credits a month and Submagic runs $12, $23 or $41 a month per member. The four count different things: Submagic counts videos and minutes a video, Kapwing subtitle minutes, Descript media hours and Vizard credits. The rates are not a like-for-like allowance.

Pick Submagic Starter for short clips, Kapwing Pro for long videos and Vizard Creator to pay by the minute of video. Submagic vs Descript covers long recordings, and the main list is the best AI video caption generator page.