Post Letters - What file formats are supported?
We support A4, but will auto resize for countries like the US.
10 MB max. If you need larger files to be supported, please let us know.
Via the Dashboard
If you need any more file types, please let us know.
Via the API
If you need to convert a file to a PDF, it can be first passed to our uploads endpoint: /uploads?convert=post View Docs
This will return a URL to the converted pdf file that can be used in the /post/letters/send endpoint View Docs