Your files stay on your Mac.
Convertessa reads your Markdown headings and maps them into a structured OPML outline tree. Each heading level — H1 through H6 — becomes a nested outline node in the output file. The result is a valid OPML document ready for any outline-aware reader or podcast app.
Drag one .md file or an entire folder onto Convertessa. The app reads every file you drop — no size limit, no upload.
Pick OPML from the output format list. Convertessa maps each heading level in your Markdown source to the corresponding depth in the OPML outline tree.
Click Convert. Your OPML files appear beside the originals instantly. Metadata is stripped from the output and the originals are left untouched.
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.
Each heading level maps directly to outline depth: an H1 becomes a top-level <outline> node, H2 becomes a child of the nearest H1, and so on down to H6. Body text between headings is attached as the text attribute of the preceding node.
Yes. Drop a folder onto Convertessa or run convertessa ./folder/ --to opml in the terminal. Every .md file in the folder is converted and a matching .opml file is written next to each source file.
No. Convertessa runs entirely offline. Your Markdown files are read and written locally — nothing is sent to a server or cloud service at any point.