CloudConvert
cloudconvert.com
Converts between around 200 file formats, including the awkward ones
Free tier
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cloudconvert.com
Converts between around 200 file formats, including the awkward ones
convertio.co
Drag a file in, pick an output format, download the result
cryptpad.fr
Collaborative documents the server cannot read, with no account to start
draftable.com
Shows exactly what changed between two versions of a document
docs.google.com
Several people typing in one document without overwriting each other
notebooklm.google.com
Summarises only the sources you upload, and cites the exact passage
pandadoc.com
Sends a document out for a legally binding electronic signature
pandoc.org
Converts between Markdown, LaTeX, DocBook, reStructuredText and dozens more
zamzar.com
The email-me-the-converted-file service from 2006, still converting
Cuts across
A tag is orthogonal to the category tree — that is what makes it worth having.