Maskelyne

Maskelyne converts video and audio files on your Mac. Drop in a clip, pick a format, and it uses your Mac's own media engine to do the work — no upload, no account, no sign-in.

• Convert between MP4, MOV, M4V and more
• Extract the audio track to M4A or AIFF
• Remux without re-encoding when the codecs already match
• Trim to a range and pick which tracks come along
• Hardware-accelerated on Macs that have a media engine, with an automatic software fallback
• Batch-convert whole folders

Free for everyday conversions. A one-time Pro unlock adds batch folders, every output format, trimming and track selection, presets and automation — no subscription.

Maskelyne collects anonymous usage and crash diagnostics to fix bugs; it never sees your media or file contents.