Your files stay on your Mac.
Convertessa reads each .md file and writes a .ipynb Jupyter Notebook with your content placed into markdown cells. The conversion runs entirely on your Mac — files never leave your machine. Batch-convert a whole folder of Markdown documents in one pass.
Drag one .md file or an entire folder of Markdown documents onto Convertessa. No upload required — everything stays local.
Choose Jupyter Notebook (.ipynb) from the output list. Convertessa will map each Markdown document to a notebook composed of markdown cells.
Click Convert. Convertessa writes .ipynb files alongside your originals, ready to open in JupyterLab, VS Code, or any notebook environment.
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. Convertessa preserves your Markdown source inside notebook markdown cells, so headings, fenced code blocks, lists, and inline formatting all carry over intact.
Yes. Drop a folder onto Convertessa or pass a directory on the command line (convertessa ./docs/ --to ipynb) and every .md file inside is converted in one pass.
No. Convertessa runs entirely offline on your Mac. Your Markdown files are never uploaded to any server.