Your files stay on your Mac.
Convertessa reads your .txt file and writes it out as a .md file, preserving every line of content. Because Markdown is a superset of plain text, no content is altered — you get a ready-to-edit Markdown file. The conversion runs entirely on your Mac; your files never leave your machine.
Drag one or more .txt files — or an entire folder — onto Convertessa.
Pick Markdown from the output format list, then confirm your selection.
Click Convert. Convertessa writes each .md file alongside the original, locally, with no upload required.
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. Markdown is a superset of plain text, so every character in your .txt file is preserved exactly in the output .md file. No reformatting or rewriting occurs.
Yes. Drag a folder onto Convertessa or run convertessa folder/ --to md in the terminal. Every .txt file in the folder is converted in one pass.
Never. Convertessa runs entirely on your Mac. Your files are read and written locally and never leave your machine.