Your files stay on your Mac.
Converting a Jupyter Notebook to HTML renders every cell — code, output, and Markdown — into a self-contained webpage that opens in any browser without Python or Jupyter installed. Convertessa reads the .ipynb file directly on your Mac; nothing is uploaded and no kernel is required. The resulting HTML preserves charts, tables, and rich output exactly as they appear in the notebook.
Drag one or more .ipynb files — or an entire folder of notebooks — into Convertessa. Batch conversion processes all of them in one pass.
Choose HTML from the output list. Convertessa targets the html format and maps every notebook cell to its HTML equivalent, including inline images and code blocks.
Click Convert. Convertessa writes a .html file alongside each source notebook. Open it in any browser — no Python, no Jupyter, no internet connection needed.
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 reads the saved .ipynb file directly. As long as cell outputs were saved when the notebook was last run, they appear in the HTML — no Python environment or active kernel is required.
Yes. Outputs stored in the notebook — matplotlib figures, DataFrames, print text, and inline images — are embedded in the HTML at full resolution. Convertessa does not re-execute any code.
Yes. Point Convertessa at a folder and it converts every .ipynb file inside in one batch, writing a matching .html file next to each notebook.