Your files stay on your Mac.
Converting Markdown to ICML packages your .md content into Adobe InCopy's XML markup format, ready to place directly into InDesign layouts. Convertessa reads each file locally, preserving headings, paragraphs, and inline styles as InCopy story structure. No internet connection needed — files never leave your Mac.
Drag one or more .md files into Convertessa, or point it at a folder to batch-convert an entire collection of Markdown documents in one pass.
Choose ICML (InCopy) from the output format list. Set quality to taste, then confirm your selection.
Click Convert. Convertessa writes .icml files alongside your originals — offline, nothing uploaded, ready to link in InDesign.
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. Drag an entire folder onto Convertessa and every .md file inside is converted to ICML in a single batch — no need to process files one by one.
No. Convertessa runs fully offline. Your Markdown files are read and written locally; nothing is transmitted to any server or cloud service.
Convertessa strips metadata during conversion, so the resulting .icml file contains only your document content — no embedded author, date, or tool information.