Free Online Tools: Image Converter Subtitles Converter Subtitles Finder Imgur Downloader
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What is the price? Are there any packages?

All the APIs here are free to use. There are no premium/paid packages.

How long are URLs to converted files kept?

About 48 hours. So if the API returns an URL like this:
http://api.rest7.com/temp/1508288400/8f836fd660a014f99f4fe0c5d073af0[...]
please download this file as soon as possible.

How can I log in or register?

You cannot. It's not needed. The APIs do not require any API key or anything like that.
You are, however, encouraged to subscribe to stay informed of any changes to the APIs.
You can subsribe at the bottom of the page.

Are you going to add more APIs?

Absolutely! If you have anything specific in mind- please describe it on Github

How can I contact you?

Please visit rest7 on github.com.