Your files stay on your Mac.
OPML stores hierarchical outlines — podcast feeds, reading lists, topic trees — as nested XML. Converting to Emacs Muse maps that structure to Muse headings and list syntax so you can edit, publish, or archive the outline inside Emacs. Convertessa runs entirely on your Mac; no file ever touches a server.
Drag one file or an entire folder of .opml files onto Convertessa. Batch mode processes every file in one pass without any per-file setup.
Choose Emacs Muse from the output format list. Convertessa maps each OPML outline level to the corresponding Muse heading or list element.
Click Convert. Your .muse files appear alongside the originals, ready to open in Emacs or any plain-text editor.
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. Each level of OPML nesting becomes the corresponding Muse heading level or indented list item, preserving the full outline hierarchy in the output file.
Yes. Pass a folder path to Convertessa and every .opml file inside is converted in one batch. Use convertessa folder/ --to muse from the command line.
Convertessa carries over the text and title attributes that make up the readable outline. Feed-specific attributes such as xmlUrl are dropped because Emacs Muse has no equivalent metadata field for them.