Your files stay on your Mac.
Jupyter Notebooks store prose, code, and outputs in a structured JSON format. Converting to Djot rewrites the notebook's markdown and code cells as clean Djot markup — a lightweight, unambiguous plain-text format. The result is a portable document you can version-control, edit, or publish outside a Jupyter environment.
Drag one or more .ipynb files into Convertessa — or point it at a folder to batch-convert an entire project at once.
Pick Djot from the output list. Convertessa reads each notebook's cells and prepares the Djot conversion.
Click Convert. Convertessa writes a .djot file for each notebook. Files never leave your Mac.
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.
Markdown cells become Djot paragraphs and headings; code cells become fenced code blocks with the appropriate language hint. Kernel metadata, cell IDs, and execution counts embedded in the .ipynb JSON are not carried over — only the human-readable content is written to the file.
Yes. Drag a folder onto Convertessa to batch-convert every .ipynb file inside it, or run convertessa ./notebooks/ --to djot from the command line to process the entire directory.
Entirely. Convertessa runs offline — no file is uploaded to any server and no account is required. The conversion happens locally on your Mac.