Your files stay on your Mac.
JATS XML encodes the structure of academic articles — sections, subsections, titles, and abstracts — as nested XML elements. Converting to OPML maps that hierarchy directly onto an outline tree, making the article's structure portable to outliners, feed readers, and any tool that consumes OPML. Metadata is stripped from the output; only the structural content carries over.
Drag one .jats file or an entire folder of articles onto Convertessa. The app reads the nested section hierarchy from each file without sending anything to a server.
Choose OPML from the output format list. Convertessa maps each JATS section element to a matching OPML outline node, preserving the depth of the original document tree.
Click Convert. Each JATS file becomes a self-contained .opml file ready to open in any outliner or feed-management tool. Batch jobs run in parallel so large folders finish quickly.
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 <sec> element in the JATS source becomes a child <outline> node in the OPML output, so the full depth of the article hierarchy is retained.
No. Convertessa strips metadata during the conversion. The OPML output contains the structural outline of the article — titles and section text — but not bibliographic fields.
Yes. Drop the folder onto Convertessa or use the CLI: convertessa ./articles/ --to opml. Every .jats file in the folder is converted and written as a separate .opml file. Files never leave your Mac.