Convert M2TS to MP4 Online — No Upload, No Watermark
M2TS is the AVCHD/Blu-ray transport stream emitted by Sony, Panasonic, and Canon camcorders. Converting to MP4 gives you a file that plays on every phone, browser, and editor without re-encoding at playback time.
Drag & drop your video here, or click to browse
Max file size: ~2 GB (memory permitting)
Where M2TS files come from
M2TS is the AVCHD format, written by Sony, Panasonic, Canon and JVC camcorders onto their internal memory or SD cards, and used on Blu-ray discs. Files sit inside a BDMV or AVCHD folder structure rather than loose on the card.
What changes when you convert M2TS to MP4
| Container | Blu-ray transport stream rewritten as MP4 with a seek index |
|---|---|
| Video | H.264 re-encoded at CRF 23 |
| Audio | AC-3 or PCM re-encoded to AAC |
Worth knowing first
AVCHD splits long recordings into separate M2TS files at around 2 GB and relies on playlist files elsewhere in the folder to stitch them back together. Copy only the M2TS files off the card and a long take arrives as several clips. Convert each one, then join them with the Video Merger.
FAQ
My camcorder recording is split into several files. Why?
AVCHD splits at a file size limit inherited from FAT32 formatting, usually around 2 GB, and stores playlist files that tell a compatible player to treat the parts as one recording. Copying just the M2TS files loses those playlists. Convert the parts and join them afterwards to restore the single take.
Why will my editor not import M2TS directly?
Many will, but the transport stream has no index, so import is slow and scrubbing stutters. Converting to MP4 first is standard practice for AVCHD footage and usually saves more time than the conversion costs.
Does converting lose camera metadata?
Shooting data stored in AVCHD's own structures does not survive, since MP4 has nowhere standard to put it. The picture, the audio and the recording timestamp do carry across.
Is this M2TS to MP4 converter really free and without upload?
Yes. The tool runs entirely in your browser using FFmpeg compiled to WebAssembly. Your M2TS file never leaves your device — open the DevTools Network tab to verify zero uploads. No signup and no watermark. The practical size limit is the memory your browser gives this tab, which is generous on a computer and a few hundred megabytes on a phone.