Your files stay on your Mac.
Convertessa reads your .md files and outputs standard HTML documents. Headings, paragraphs, lists, links, inline code, and fenced code blocks are all rendered into their HTML equivalents. Processing happens entirely on your Mac — no files are uploaded.
Drag one or more .md files onto Convertessa, or drop a whole folder to convert in batch.
Choose HTML from the output format list. Convertessa will render every Markdown file to a matching .html document.
Click Convert. Each .md file is rendered to HTML and saved alongside the original — filenames stay the same, only the extension changes.
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 output file keeps the same name as the source .md file, with the extension changed to .html.
No. Convertessa runs entirely on your Mac. Files are read and written locally and never leave your machine.
Headings, paragraphs, bold, italic, blockquotes, ordered and unordered lists, inline code, fenced code blocks, links, and images are all rendered into their HTML equivalents.