Your files stay on your Mac.
Emacs Muse is a lightweight plaintext markup format for structured writing inside Emacs. Converting to OpenDocument Text produces a .odt file that any ISO-standard word processor — LibreOffice, OpenOffice, or Word — can open and edit. Convertessa performs the conversion entirely on your Mac; no file is ever uploaded.
Drag one .muse file or an entire folder onto Convertessa. Batch mode processes every file in the folder in a single pass.
Pick OpenDocument Text from the output list. Set quality to control how embedded images are encoded in the resulting .odt file.
Click Convert. Convertessa writes .odt files alongside your originals — or to a destination folder you choose — without uploading anything.
Images, audio, video, documents, archives and eBooks — all converted natively, right on your Mac.
Pick a format you have — see everything Convertessa can turn it into.
Convert hundreds of files at once with per-type group defaults and individual overrides.
First-class support for HEIC, AVIF and WebP — encode and decode, both ways. Read JPEG XL and a dozen more modern formats too.
Drop files anywhere on the window. Native, instant, and exactly what you’d expect on a Mac.
Dial in compression, resolution and bitrate. Keep originals pristine or shrink for sharing.
Never overwrite a file by accident. Convertessa appends safe suffixes automatically.
Every job is logged locally. Re-run a previous conversion or revisit recent outputs in a click.
Bundle your converted files straight into a single ZIP, TAR or 7z — packaged and ready to share the moment a job finishes.
Right-click any file in Finder and choose Convert. A Quick Action handles it on the spot — no need to open the app first.
Shrink Convertessa to a tidy mini window that tucks into a corner — just a drop zone and a format picker for quick, one-off conversions.
No cloud. No account. No upload. Every conversion happens entirely on-device, using the power already in your Mac. What you convert is nobody’s business but yours.
Script conversions, wire them into your build, or batch a folder from the terminal. The same engine, no GUI required.
Read the full CLI documentation →Shrink Convertessa down to a small, focused window — drop, convert, done, with your recent conversions one click away.
macOS 14+ · Apple Silicon & Intel
New formats, new features, and fixes — every release, on the record.
Yes. OpenDocument Text is the native format of LibreOffice Writer and is supported by Microsoft Word 2007 and later. Any application conforming to ISO 26300 can open the output file.
Yes. Convertessa strips embedded author, revision, and other metadata from the output .odt file so you control what information is included when you share the document.
Yes. Drop a folder onto Convertessa or run convertessa /path/to/folder --to odt in the terminal. Every .muse file in the folder is converted in one batch.