What Video Formats and File Limits Does Video to Prompt Support?

Updated

Video to Prompt accepts MP4, MPEG/MPG, AVI, FLV, WEBM, WMV, 3GPP, and MOV files, with a maximum size of 20 MB per upload. If your clip is in one of those formats and under that limit, you can upload it directly and get an AI-generated text prompt or description back. The site also states that processing is handled securely and that prompt generation supports 15 languages.

Supported Video Formats

The uploader accepts the following container formats:

Format Common source
MP4 Phones, screen recorders, most exports
MPEG / MPG Older cameras, DVD rips
AVI Legacy Windows tools, some cameras
FLV Older web/streaming captures
WEBM Browser recordings, screen captures
WMV Windows Media exports
3GPP Mobile phone recordings
MOV iPhone, macOS, many editing tools

If your file is in a format not on this list, you would need to convert it before uploading. Most video editors and free converters can output MP4, which is the safest general choice.

File Size Limit

The stated limit is 20 MB per video file. This is a per-file cap, not a total-account cap, based on the site's description.

A 20 MB ceiling is small by video standards. As a rough guide, short clips at lower resolution fit comfortably, while longer or high-bitrate footage will exceed it. If your file is too large, the practical options are:

  • Trim the clip to the section you actually want described
  • Re-export at a lower resolution or bitrate
  • Split a long video into several shorter uploads

What Happens After You Upload

  1. You select or upload a video file (within the format and size limits above).
  2. The site analyzes the content and generates a detailed text description or prompt.
  3. You can refine the result interactively to focus it on what you need.

The site describes the average processing time as about 10 seconds, and says video data is handled securely throughout analysis. It also reports being used by 1000+ users worldwide.

Language Support

Prompt generation is multilingual, with 15 languages supported. This means you can work in your preferred language rather than being limited to English output.

Adapting Prompts for Specific Generators

Beyond a general description, the site offers prompt generators tailored to specific AI video platforms, including Kling AI, Runway, Seedance, and Veo 3. These are aimed at producing prompts with platform-appropriate detail — for example, camera movement and lighting cues — so the output is closer to ready-to-use for that generator.

Quick Checklist Before Uploading

  • Format is one of: MP4, MPEG/MPG, AVI, FLV, WEBM, WMV, 3GPP, MOV
  • File size is 20 MB or less
  • Clip contains the content you want described (trim first if needed)

If all three are true, you can upload and expect a prompt back in roughly seconds. If the format or size fails, convert or trim first — those are the two conditions most likely to block an upload.