Your files stay on your Mac.
Converting FLAC to WAV unpacks lossless-compressed audio into raw uncompressed PCM — the format expected by DAWs, hardware samplers, and legacy players that don't read FLAC. The output is bit-for-bit identical to the original source; nothing is re-encoded or degraded. Files never leave your Mac.
Drag one file or an entire folder into Convertessa. The app reads every .flac in the selection, including nested subfolders.
Pick WAV from the output format list. Because WAV is lossless, no quality slider appears — the full audio resolution is preserved automatically.
Click Convert. Convertessa writes one uncompressed WAV beside each input file. Original FLAC files are left untouched.
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. FLAC is lossless compression, meaning it stores the exact same PCM data as the WAV it came from. Decoding it to WAV produces a bit-perfect uncompressed copy — no generation loss, no re-encoding.
FLAC compresses audio without discarding any data, typically to 50–60 % of the original size. WAV stores the same PCM samples uncompressed, so the files are proportionally larger. The audio content is unchanged.
Yes. Drag a folder onto Convertessa or run convertessa ./folder --to wav to process every FLAC inside in a single pass. Subfolder structure is preserved in the output.