Document format depends on the type of service you choose (editing, translation, web).
For the editing/revision of a document, I prefer manuscripts to be submitted in MS Word format (.doc, .docx), although I can also work with TXT and RTF files. Please also include tables and figures (in image or PDF formats), as well as table and figure legends, for reference (no editing will be performed on these files).
For translations, I accept all the major file formats, including Microsoft Office (Word, Excel, Powerpoint), TXT and RTF files, and PDFs while for web services you can either send me the document that needs revision/translation with all encoding or mark-up languages removed (in .txt, .doc, rtf, etc.) or you can ask me to revise/translate the source files directly (.asp, .htm(l), .php, .xml, java to cite some). However, I do request a surcharge (20%) for the revision/translation of a website in source code vs. word format as the translation process is more time-consuming and requires an additional quality check.