Your files stay on your Mac.
Emacs Muse files are lightweight plain-text documents authored inside Emacs. Converting them to RTF renders the markup as styled rich text that opens in Word, LibreOffice, TextEdit, and any other word processor. The conversion runs entirely on your Mac — your files never leave your machine.
Drag one .muse file or an entire folder into Convertessa. Batch mode processes every file in one pass with no size limit.
Choose Rich Text from the output list. Because RTF can embed lossy image data, you can set quality for any embedded images before the conversion runs.
Click Convert. Convertessa writes the .rtf files alongside your originals — offline, no account, no internet connection required.
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. Headings, bold, italic, and list structure in your .muse source are rendered as native RTF styles, so the document hierarchy survives the conversion intact.
Yes. Drop a folder onto Convertessa or pass the directory on the command line — convertessa ./folder --to rtf — and every .muse file inside is converted in one batch.
No. Convertessa runs entirely offline on your Mac. Your .muse files are read and written locally; nothing is sent to any server.