Your files stay on your Mac.
Convertessa reads your .rtf files and writes them out as .ipynb Jupyter Notebooks, mapping rich text content to notebook cells. Conversion runs entirely on your Mac — no upload, no cloud. Batch-convert a whole folder of documents in one pass.
Drag one or more .rtf files — or an entire folder — onto Convertessa. The app reads every file locally; nothing is sent to a server.
Choose Jupyter Notebook from the output list. Convertessa will write each source file as a self-contained .ipynb notebook.
Click Convert. Your .ipynb files land in the same folder as the originals, ready to open in JupyterLab, VS Code, or any compatible notebook editor.
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.
No. Convertessa runs entirely on your Mac. Your .rtf files are read from disk and the .ipynb output is written back to disk — no network connection is used at any point.
Yes. Drop an entire folder onto Convertessa or use the CLI: convertessa *.rtf --to ipynb. Every .rtf file in the folder is converted in one pass.
No. Convertessa strips document metadata from the source .rtf before writing the .ipynb output, so author names, revision history, and other embedded properties are not included in the exported notebook.