
Online File Conversion API.
Api2Convert API is a free Documents & Productivity API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
REST API to convert and edit files in the cloud
Details from api2convert.com.

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The Api2Convert API is provided by API2Convert (api2convert.com). REST API to convert and edit files in the cloud
Yes. The Api2Convert 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 Api2Convert API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Api2Convert API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Api2Convert API is served over HTTPS, so it's safe to use in production.