Your files stay on your Mac.
Convertessa reads your Rich Text (.rtf) files and emits plain Emacs Muse markup — the lightweight format used by Emacs Muse-mode for authoring and publishing. Headings, paragraphs, and inline styles are mapped to their Muse counterparts, and embedded document metadata is stripped from the output. The entire conversion runs on your Mac; no file is ever uploaded.
Drag one .rtf file or an entire folder onto Convertessa. Batch mode walks every RTF file in the folder and queues them for conversion in a single pass.
Pick Emacs Muse from the output format list. Convertessa targets the .muse extension and maps RTF structure — headings, paragraphs, bold, italic — to the corresponding Muse directives.
Click Convert. Your .muse files land alongside the originals, or in a destination folder you specify, ready to open in Emacs.
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.
RTF heading levels (Heading 1, Heading 2, and so on) are mapped to the equivalent Emacs Muse heading directives — * Title, ** Subtitle, and so on — preserving the document hierarchy in the output file.
No. Convertessa strips embedded document metadata — author fields, title properties, and revision history stored in the RTF header — so the output is a clean Muse file with no residual document properties.
Yes. Drop a folder onto Convertessa or run convertessa ./folder --to muse in the terminal. Every .rtf file in the folder is converted in one batch, entirely offline.