Your files stay on your Mac.
Convertessa reads the tabular data in your OpenDocument Sheet and writes each row as a line of comma-separated values. Formulas are resolved to their computed results, and the output is plain UTF-8 text that any spreadsheet app, database, or script can ingest. Files never leave your Mac.
Drag one ODS file — or an entire folder of them — onto Convertessa. Batch mode converts every file in one pass.
In the output format list, select CSV. Convertessa will write one CSV file per sheet, preserving the row and column layout exactly as stored in the source.
Click Convert. Convertessa processes everything locally; your files are never uploaded. The resulting CSV files land in the folder you choose.
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 sheet in the workbook is exported as a separate CSV file, named after the original sheet tab.
Convertessa writes the computed value of each cell. CSV is a plain-text format with no formula support, so only results are carried over.
Yes. Document metadata embedded in the ODS file — such as author, revision history, and creation date — is not written to the CSV output.