Your files stay on your Mac.
Convertessa reads each .ipynb file and writes a .md file alongside it. Code cells become fenced code blocks with the original language tag preserved. Markdown cells pass through exactly as written.
Drag one .ipynb file or an entire folder of notebooks into Convertessa. Everything stays on your Mac — no upload, no internet required.
Choose Markdown from the output format list. Convertessa will write a .md file for every notebook you dropped.
Click Convert. Each .ipynb becomes a .md file placed next to the original. Code cells are wrapped in fenced code blocks; Markdown cells pass through unchanged.
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 code cell is wrapped in a fenced code block with the notebook's kernel language tag (e.g. ```python). The cell source is preserved exactly as written.
Yes. Drop a folder onto Convertessa and every .ipynb file inside is converted to Markdown in one pass. From the command line: convertessa ./notebooks/ --to md.
No. Convertessa runs entirely on your Mac. Your .ipynb files are read and written locally — nothing is uploaded to any server.