You can upload most file formats, like Word, Excel, Google doc, Google sheet, HTML and PDF. For the best result we advise you to use PDF documents.
Other file formats will work as well but depending on the complexity the document can change a bit during the conversion process. When in doubt it's best to test the file and if needed adjust the file to improve the result after conversion.
The maximum supported file size is currently around 50 pages (depending on the file format). For large files the conversion process will however take a while. We're working on a solution that will solve this. Sometimes users also split the document, in a part that needs to be signed and a part that is added as an attachment.