HTML animation to a YouTube Short

YouTube Shorts are vertical and unforgiving — a stuttery screen recording stands out for the wrong reasons. Framecast renders your HTML or Claude animation frame-by-frame into a clean 9:16 MP4, watermark-free, so your Short looks rendered, not recorded.

One-time $2.99 · free watermarked preview first.

YouTube Shorts specs

Three steps

1. Drop your HTML

   Drag your animation file into the studio. Made it in Claude? See Claude animation to video.

2. Take the 9:16 export

   One drop produces 16:9, 9:16 and 1:1. Grab the vertical 9:16 file — that's the native Shorts shape.

3. Upload as a Short

   Upload the MP4 to YouTube; the vertical aspect and short length tag it as a Short automatically.

Tips for Shorts that hold

• Lead with motion. Put your strongest movement in the first second — Shorts are won or lost before the title registers.
• Design it to loop. A clean loop replays seamlessly and quietly inflates watch time.
• Render at 4K, post vertical. Extra source resolution survives YouTube's re-compression and keeps gradients smooth.

Also posting elsewhere? Same drop covers TikTok and Instagram Reels. Curious why not just screen-record? See vs. screen recording.