Your files stay on your Mac.
Convertessa wraps each paragraph and line break in clean HTML elements, turning a plain .txt file into markup that's ready for any web page or CMS. Every conversion runs locally on your Mac — your text never touches a server. Drop a single file or an entire folder and convert them all in one pass.
Drag one .txt file or a whole folder onto Convertessa. Batch mode handles as many files as you need in a single run.
Choose HTML from the output list. Convertessa applies the correct settings to produce valid HTML output.
Click Convert. Convertessa processes everything offline and writes clean .html files to your chosen destination — no account or 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. Convertessa runs entirely on your Mac. Your .txt files are read and written locally — nothing is sent to a server or third-party service.
Yes. Drop a folder onto Convertessa or run convertessa *.txt --to html from the command line and every file in that folder is converted in one batch.
Plain .txt files carry no embedded metadata, so nothing needs to be stripped. The resulting HTML contains only the content from your source file.