Your files stay on your Mac.
Convertessa reads each .txt file and packages its content as a Jupyter Notebook (.ipynb), placing the text into a markdown cell. The resulting notebook opens in JupyterLab, VS Code, or any compatible environment with no extra setup. Conversion runs entirely offline — your files never leave your Mac.
Drag one .txt file or an entire folder onto Convertessa. Batch mode queues every .txt file in the folder automatically, with no extra steps.
Choose Jupyter Notebook (.ipynb) from the output format list. Convertessa targets .ipynb for every file in the queue.
Click Convert. Each .txt file becomes a standalone .ipynb notebook with the original text in a markdown cell — no internet connection or upload required.
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.
Convertessa places the full contents of each .txt file into a single unexecuted markdown cell in the resulting .ipynb file. Open it in JupyterLab, VS Code, or any Jupyter-compatible environment to run or edit immediately.
Yes. Drop a folder onto Convertessa or run convertessa folder/ --to ipynb in the terminal. Every .txt file in the folder is converted to its own .ipynb file in one pass.
No. Convertessa runs entirely offline. Your .txt files are read and written locally — nothing is sent to a server or cloud service.