Convert video, audio, image, and document files programmatically.
RunConvert API is a free Documents & Productivity API that requires apiKey authentication, is served over HTTPS and does not support CORS, so it should be called from a server.

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Yes. The RunConvert API is listed in the Documents & Productivity category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The RunConvert API uses apiKey authentication, so you need to register for credentials before making requests.
Not directly. The RunConvert API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The RunConvert API is served over HTTPS, so it's safe to use in production.