Your files stay on your Mac.
Convertessa reads your .ipynb file — cells, code blocks, markdown, and embedded outputs — and packages them as a self-contained EPUB document. The resulting file opens in any EPUB reader without an account or internet connection. All processing runs locally on your Mac; files never leave your machine.
Drag one or more .ipynb files — or an entire folder — into Convertessa. The app reads each notebook's cells, markdown, code blocks, and embedded outputs without uploading anything.
Choose EPUB from the output format list. Because EPUB embeds images, you can set quality for any image outputs packed into the ebook before converting.
Click Convert. Convertessa writes one .epub file per notebook, preserving resolution on embedded images and stripping EXIF metadata. Files land in the folder you choose.
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. Each code cell is output as a monospaced code block in the EPUB. Markdown cells become formatted prose, and output cells — including inline images — are embedded directly into the ebook.
Yes. Drop an entire folder onto Convertessa or run convertessa ./notebooks/ --to epub in the terminal. One .epub file is created per .ipynb file.
Yes. Convertessa strips EXIF and other metadata from images packed into the EPUB output. No location, camera, or author data is carried over from the original notebook files.