We support A4. All sheets will need to be in portrait orientation. You can still send landscape pages, they must be in portrait orientation though.
4 MB max. If you need larger files to be supported, please let us know.
If you need any more file types, please let us know.
If you need to convert a file to a PDF, it can be first passed to our uploads endpoint: /uploads?convert=fax
This will return a URL to the converted pdf file that can be used in the /fax/send endpoint.
Inbound fax will be converted to a PDF.
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