What is the native format for

I would like to export some text documents and be sure that I will get back the same appearance of my documents if I restore them.
I found that odt is not good and docx is not perfect too.
So, what is the best format to export among the 13 formats proposed when I do “Format/download…” ? (odt, docx, docxf, …)
And, it is probably the same answer, what is the native or natural format for text documents in onlyoffice ?
Regards,
Herve

Hello @Herve

The native file format used in ONLYOFFICE Docs is OOXML.
More about format you can read here:
https://en.wikipedia.org/wiki/Office_Open_XML

We recommend to use the OOXML format when using our application whether it is downloading, uploading or converting.