DemoPolish

DemoPolish turns rough software recordings into narrated product demos. Upload an MP4, MOV, or WEBM file from Loom, OBS, QuickTime, Screen Studio, or another recorder. Clips can be up to 10 minutes long and uploads can be up to 4K. DemoPolish rewrites the rough narration, adds an AI voiceover, and renders a finished video in about 60 seconds. After rendering, you can edit individual lines, preview how they sound, and re-voice only the lines you change. The current video remains available to download while the new version is prepared. You can also change the voice or music for the whole video without losing the script. Six AI voices are available, with an option to keep a consistent brand voice across clips. Videos export as 1080p H.264 MP4 files for use on landing pages, in social posts, sales calls, and emails. The service is designed for founders and product teams who want to polish demos without recording multiple takes or learning a video editor. You can re-polish the same clip with a different voice or edited script at no extra cost. Rendered videos include commercial rights; customer uploads are deleted after 30 days and are not used to train models.