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Converting media on a Mac, the right way.
Straight-talking guides for turning HEIC into JPG, MKV into MP4, RAW into TIFF, and video into MP3 or GIF — all on your Mac with Zumkor, no cloud, no subscription.
Photos & RAW images
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How to convert PNG to WebP on Mac (batch, offline, 2026)
Convert PNG to WebP on your Mac for faster pages — with Google's free cwebp tool or Zumkor for whole folders, transparency kept, fully offline.
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How to convert AVIF to JPG on Mac (batch, offline, 2026)
Got an .avif file that won't open or upload? Convert AVIF to JPG on your Mac with Preview, Quick Actions, sips, or Zumkor — single files or folders, fully offline.
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How to convert TIFF to JPG on Mac (batch, offline, 2026)
Huge TIFF scans that won't email or upload? Convert TIFF to JPG on your Mac with Preview, Finder Quick Actions, sips, or Zumkor — batch whole folders, fully offline.
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How to convert RAW to JPG on Mac (CR2, CR3, NEF, ARW — batch)
Convert camera RAW files — CR2, CR3, NEF, ARW, RAF, DNG — to JPG on your Mac with Preview, sips, or Zumkor. Batch whole shoots offline, nothing uploaded.
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How to convert WebP to PNG on Mac (keep transparency, 2026)
Convert WebP to PNG on your Mac and keep transparency intact — with Preview, Finder Quick Actions, sips, or Zumkor for whole folders, fully offline.
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How to convert HEIC to PNG on Mac (batch, offline, 2026)
Convert HEIC to PNG on your Mac with Preview, Finder Quick Actions, sips, or Zumkor — batch whole folders offline, keep wide-gamut color, and strip GPS data first.
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How to convert JPG to PNG on Mac (batch, offline, 2026)
Convert JPG to PNG on your Mac with Preview, Finder Quick Actions, sips, or Zumkor — batch whole folders offline, plus what PNG can and cannot fix about a JPG.
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How to convert PNG to JPG on Mac (batch, offline, 2026)
Convert PNG to JPG on your Mac with Preview, Finder Quick Actions, sips, or Zumkor — shrink huge screenshots, batch whole folders, fully offline, nothing uploaded.
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How to convert WebP to JPG on Mac (batch, offline, 2026)
Convert WebP images to JPG on your Mac with Preview, Finder Quick Actions, sips, or Zumkor — single files or whole folders, fully offline, nothing uploaded.
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How to Convert HEIC to JPG on Mac (One Photo or a Whole Folder)
HEIC photo won't open? Convert HEIC to JPG on your Mac with Finder, Preview, Photos or Terminal, all free and built in, or batch whole folders with Zumkor. No upload.
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Video formats
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How to convert FLV to MP4 on Mac (old Flash video, offline)
QuickTime won't open FLV files, and Flash is gone. Convert FLV to MP4 on your Mac with ffmpeg or Zumkor: lossless when the video is H.264, whole folders, offline.
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How to convert M4V to MP4 on Mac (rename, remux or batch)
M4V rejected by an uploader or a Windows PC? Convert M4V to MP4 on your Mac without re-encoding, using a rename, ffmpeg or Zumkor. Whole folders, offline.
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How to convert VOB to MP4 on Mac (home DVD files, offline)
A VIDEO_TS folder full of .VOB files that QuickTime won't open? Convert VOB to MP4 on your Mac with ffmpeg or Zumkor. Join the parts, then convert whole discs offline.
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How to convert MTS to MP4 on Mac (AVCHD camcorder footage)
Old camcorder .MTS clips buried in an AVCHD folder? Convert MTS to MP4 on your Mac with iMovie, ffmpeg or Zumkor. Whole cards at once, fully offline.
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How to convert MP4 to MOV on Mac (lossless, batch, 2026)
Editor, ingest system, or delivery spec demanding a QuickTime .mov? Convert MP4 to MOV on your Mac with QuickTime Player, ffmpeg, or Zumkor — lossless, batch, offline.
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How to convert WMV to MP4 on Mac (offline, batch, 2026)
WMV files won't open in QuickTime — and never will. Convert WMV to MP4 on your Mac with ffmpeg or Zumkor: batch whole folders, hardware-accelerated, fully offline.
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How to convert AVI to MP4 on Mac (offline, batch, 2026)
Old AVI files won't play in QuickTime? Convert AVI to MP4 on your Mac with ffmpeg or Zumkor — batch whole folders, hardware-accelerated, fully offline, nothing uploaded.
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How to convert WebM to MP4 on Mac (offline, batch, 2026)
WebM won't open in QuickTime? Convert WebM to MP4 on your Mac with ffmpeg or Zumkor — batch whole folders, hardware-accelerated, fully offline, nothing uploaded.
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How to convert MOV to MP4 on Mac (lossless, batch, 2026)
Convert MOV videos to MP4 on your Mac with iMovie, ffmpeg, or Zumkor. Includes the lossless stream-copy trick that remuxes in seconds with zero quality loss.
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How to Convert MKV to MP4 on Mac in Seconds, Without Losing Quality
MKV won't open in QuickTime? Convert MKV to MP4 on your Mac without re-encoding: one ffmpeg command, or drag a folder into Zumkor. Plus the no-sound and subtitle fixes.
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Audio formats
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How to convert FLAC to ALAC on Mac (lossless, for Apple Music)
Apple Music won't import FLAC. Convert FLAC to ALAC on your Mac with afconvert, ffmpeg or Zumkor: bit-identical lossless audio, whole folders, nothing uploaded.
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How to convert AIFF to MP3 on Mac (GarageBand, CD rips, batch)
AIFF files from GarageBand, Logic or old CD rips too big to share? Convert AIFF to MP3 on your Mac with the Music app, ffmpeg or Zumkor. Batch, offline.
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How to convert WMA to MP3 on Mac (old Windows music, offline)
WMA files won't open in Music or QuickTime on a Mac. Convert WMA to MP3 with ffmpeg or Zumkor — whole folders at once, WMA Lossless to FLAC, fully offline.
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How to convert OGG to MP3 on Mac (batch, offline, 2026)
OGG files your Mac refuses to play? QuickTime and Music can't open them at all. Convert OGG to MP3 on your Mac with ffmpeg or Zumkor — batch whole folders, fully offline.
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How to convert MP3 to WAV on Mac (batch, offline, 2026)
Sampler, editor, or burner insisting on WAV? Convert MP3 to WAV on your Mac with the Music app, afconvert, ffmpeg, or Zumkor — batch whole folders, fully offline.
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How to convert WAV to MP3 on Mac (batch, offline, 2026)
WAV files too big to send? Convert WAV to MP3 on your Mac with the Music app, ffmpeg, or Zumkor — batch whole folders offline, nothing uploaded.
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How to convert M4A to MP3 on Mac (batch, offline, 2026)
Convert M4A to MP3 on your Mac with the Music app, ffmpeg, or Zumkor — batch voice memos and whole folders offline, plus the cases where you should not convert.
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How to convert MP4 to MP3 on Mac (extract audio, offline)
Convert MP4 to MP3 on your Mac — or stream-copy the audio losslessly to M4A. QuickTime, ffmpeg, and Zumkor routes compared, batch-friendly and fully offline.
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How to convert FLAC to MP3 on Mac (batch, offline, 2026)
FLAC won't import into Apple Music? Convert FLAC to MP3 on your Mac with ffmpeg or Zumkor — batch whole folders offline, or go ALAC to keep it lossless.
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Shrink video to send
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How to compress video for WhatsApp on Mac (16 MB, offline)
Compress a video for WhatsApp on your Mac — trim to the moment, target 16 MB with one preset, and dodge WhatsApp's brutal recompression, fully offline.
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How to compress a video for Discord on Mac (under 10 MB)
Discord rejecting your clip? Compress a video under Discord's 10 MB limit on your Mac — QuickTime, ffmpeg two-pass, or Zumkor's Discord preset. Offline, no upload sites.
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How to Compress a Video for Email on Mac (Gmail, Outlook)
Video too big to email? Shrink it on your Mac to fit Gmail's 25 MB or Outlook's 20 MB limit with QuickTime, ffmpeg, or Zumkor, which sizes it for you. Offline, no upload.
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GIFs & subtitles
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How to convert SRT to VTT on Mac (captions for web video)
Your web player wants WebVTT and you have an .srt file. Convert SRT to VTT on a Mac with one sed or ffmpeg line, or drag a whole folder into Zumkor, fully offline.
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How to convert MP4 to GIF on Mac (Discord-ready, offline)
Turn an MP4 into an animated GIF on your Mac with ffmpeg or Zumkor — trim to the moment, land under Discord's 256 KB autoplay cap or Notion's 5 MB, fully offline.
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Convert it yourself, right on your Mac.
Everything is free for 7 days — no account, no sign-up. After that, 5 files a day (25 a week) stay free, or unlock everything once for $19.99, yours forever. Batch whole folders, 100% offline, nothing uploaded.