Your files stay on your Mac.
Convertessa reads each .ipynb file and writes a Rich Text document containing the notebook's cells and text content. Conversion runs entirely on your Mac — no upload, no internet required. Set output quality to control how embedded images are rendered in the RTF file.
Drag one .ipynb file or an entire folder of notebooks into Convertessa. Batch mode processes every notebook in one pass without extra configuration.
Choose Rich Text from the output format list. Adjust quality to control fidelity of any embedded images in the output.
Click Convert. Convertessa writes one .rtf file per notebook. Your files stay on your Mac — nothing is uploaded or transmitted.
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 extracts all cells — code, markdown, and raw — from the .ipynb file and writes their text content into the Rich Text document.
No. Convertessa runs entirely offline on your Mac. Your .ipynb files are never sent to any server or cloud service.
Yes. Pass a folder path to the CLI (convertessa ./notebooks/ --to rtf) or drag the folder into the app to batch-convert every .ipynb file in one pass.