AI Video Generator for TikTok

What this tool does

• TikTok's feed is vertical 9:16, and 1080×1920 is the resolution its upload spec recommends — the same frame VdoBloom's Clip Studio and Creator Reel render natively.
• VdoBloom's Viral Video tool generates the caption itself with exactly 12 lowercase hashtags: 4 topic-relevant, 4 all-time popular and 4 currently trending.
• Viral Video keeps the generated idea under 13 words and the environment description under 20 words, then runs a second LLM pass to expand them into the video prompt — you only ever type the topic.
• Seedance 2.5 generates 4–30 seconds in a single job at 480p or 720p — the longest single clip in the roster. Vidu Q3 reaches 16 seconds with audio; most other models cap at 15 seconds.
• Models that return native audio: MiniMax H3 (4–15s, 768P or 2K), Vidu Q3 (5, 8 or 16s) and Q3 Turbo (5 or 8s), PixVerse V6 (1–15s, 360p–1080p), Wan 2.6 Flash and Wan 2.7 (2–15s), SkyReels V4 (up to 15s at 1080p) and LTX-2 Fast (6, 8 or 10s).
• Kling V3 Turbo is billed per second — 7.2 credits per second at 720p, 9.0 at 1080p — for any length from 3 to 15 seconds, so a 7-second clip costs 50 credits at 720p.
• Cheapest vertical options in the live credit table: Bytedance V1 Lite image-to-video at 4 credits for 5 seconds (480p) or 9 credits (720p); P-Video at 8 credits for 5 seconds at 720p; Grok Imagine Video 1.5 at 8 credits for 5 seconds at 480p.
• Prompt length limits differ by model and are enforced in the editor: Runway 1,800 characters, PixVerse 2,048, Kling 2,500, Vidu 2,000 (Vidu Q1 3,000), and 5,000 for Seedance, Veo 3.1, Wan and Hailuo.
• 46 one-click effect tabs cover trend formats from a single photo — including 18 Product 360 spin styles whose prompts explicitly hold labels and text sharp and legible through the full rotation.
• Clip Studio turns one long recording into up to 5 vertical shorts of 10–75 seconds each at 1080×1920, charged at 2 credits per source minute with a 4-credit minimum.

How it works

1. 1.Type the topic, not the prompt

   Open Viral Video and enter a topic. The script engine generates the viral moment, the environment, and the caption with its 12 hashtags, then writes the full generation prompt itself. You do not need to write model-specific prompt syntax.

2. 2.Set the aspect ratio to 9:16

   Text-to-video models expose a 9:16 option directly. If you start from a photo instead, remember that most image-to-video variants — Kling 2.6, WAN I2V, WAN 2.6 Flash, MiniMax H3 I2V, Hailuo 2.3, SkyReels V4 I2V, Bytedance V1 Lite — have no aspect control and come back shaped like your upload, so feed them a vertical still. Runway Gen-4 Turbo, Grok Imagine Video 1.5, Gemini Omni I2V and Vidu 2.0 do expose a selector.

3. 3.Pick the model against your length and audio needs

   The Viral tab's picker holds Runway, Kling (V3 Turbo Text-to-Video and 3.0), MiniMax H3, Hailuo 02, PixVerse, Vidu and Veo 3.1. Need speech or a soundbed baked in? MiniMax H3 (4–15s), Vidu Q3 (16s with audio) or PixVerse V6 (1–15s). Need one continuous clip longer than 15 seconds? Switch to the Seedance Effects tab for Seedance 2.5 (up to 30s). Need cheap image-driven tests? Bytedance V1 Lite and P-Video live on the Image-to-Video tab.

4. 4.Generate several variations before you commit

   Because hooks are the variable that matters, generate the same topic on a low-cost model a few times and keep the version with the strongest opening frame. On the Viral tab the cheapest pass is Runway Gen-3 at 10 credits for 5 seconds at 720p; on the Image-to-Video tab a 5-second 480p Bytedance V1 Lite pass costs 4 credits. Either way, testing is cheap before you re-render on a premium model.

5. 5.Download and post with the generated caption

   Copy the caption and its 12 hashtags straight from the Viral Video result. Free-plan downloads carry a VdoBloom watermark; a paid plan exports the same file clean.

Frequently asked questions

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