Your files stay on your Mac.
Convertessa reads your .md files and produces EPUB ebooks directly on your Mac. The converter maps Markdown headings, paragraphs, emphasis, and code blocks into valid EPUB structure. Files never leave your machine—no upload, no account, no internet required.
Drag one .md file or an entire folder of Markdown documents onto Convertessa. Batch mode processes every file in the folder in a single pass.
Choose EPUB from the output format list. Set quality to control how embedded images inside the ebook are compressed.
Click Convert. Convertessa writes the EPUB files to the same folder, or to a destination you pick. Conversion runs entirely offline—nothing is uploaded.
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 maps Markdown heading levels (# through ######), bold, italic, code blocks, and lists to the corresponding EPUB structural elements, so the document hierarchy is preserved in the output ebook.
Yes. Drop the folder onto Convertessa or run convertessa *.md --to epub in the terminal. Every .md file in the selection is converted in one pass, producing one EPUB per source file.
No. Convertessa runs entirely on your Mac. Your .md files are never uploaded, transmitted, or stored anywhere outside your machine.