MP4 to M2TS Converter

Convert MP4 to M2TS Online

M2TS is the BDAV MPEG-2 transport stream container that Blu-ray discs and AVCHD camcorders use, so converting an MP4 into M2TS is usually the last step before authoring a disc or feeding footage back into a camcorder-style workflow. This converter re-wraps and, when needed, re-encodes your MP4 into a Blu-ray-friendly stream — pick a codec and quality preset, and download the result. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.

How to Convert MP4 to M2TS

1. Upload Your MP4 File: Drag and drop your MP4 (or M4V) onto the page, or click "+ Add Files" to browse. Add several at once to batch them with identical settings.
2. Pick a Quality Preset: Open Advanced Options and choose a Quality Preset — the default is "Very High (Recommended)". For disc authoring, H.264 is the safest video codec because every Blu-ray player is required to decode it.
3. Set Resolution or Target Size (Optional): Keep the original resolution or choose a Preset Resolution such as 1920x1080, the AVCHD/Blu-ray maximum. You can also cap output with "Specific file size" or trim to a Time Range under Trim.
4. Convert and Download: Click "Convert" and download your M2TS file. No sign-up, no watermark.

MP4 vs M2TS — What Changes

Frequently Asked Questions

What plays an M2TS file once it's converted?

On a computer, VLC and most modern media players open M2TS directly. The format's real home is hardware: Blu-ray players read .m2ts streams from the disc's BDMV/STREAM folder, and AVCHD camcorders and set-top players read the same container. For disc playback, the file also has to satisfy Blu-ray's codec and bitrate rules, not just carry the .m2ts extension.

Should I encode the video as H.264 or MPEG-2 for M2TS?

H.264/AVC is the safer default. All Blu-ray players are required to decode MPEG-2, H.264/AVC, and SMPTE VC-1, but H.264 gives you noticeably better quality per megabyte than MPEG-2, which matters when you're fitting a feature onto a disc. MPEG-2 is mainly useful for legacy or DVD-spec workflows. In our testing, the default settings target H.264 video inside the M2TS container, which is the combination most Blu-ray authoring tools expect.

Is M2TS the same as the .MTS files from my camcorder?

They're the same container with two extensions. AVCHD camcorders write .MTS because the on-card filesystem follows the legacy 8.3 naming convention; when you import those clips to a computer or place them on a Blu-ray, they take the longer .m2ts extension. The bytes inside are the same BDAV MPEG-2 transport stream. If you specifically need the camcorder extension, use our MP4 to MTS converter instead.

Will surround sound survive the conversion?

It can. Blu-ray's mandatory audio codecs are Dolby Digital (AC-3), DTS, and Linear PCM, and AC-3 carries 5.1 surround. If your MP4 already has a multichannel track, choosing an AC-3 audio output preserves those channels; a stereo MP4 stays stereo. The converter won't invent surround channels that weren't in the source.

What's the maximum resolution and bitrate for M2TS?

For AVCHD, the ceiling is 1920×1080 at up to 24 Mbit/s (28 Mbit/s in AVCHD Progressive mode). Blu-ray (BD-Video) allows a maximum video bitrate of 40 Mbit/s and a combined audio-plus-video rate of 48 Mbit/s. Staying under these limits keeps the file inside the spec a player expects; the converter's quality presets and "Specific file size" control let you target a rate that fits.

Why is my downloaded M2TS smaller than the same file on a commercial Blu-ray?

Commercial discs are mastered near the spec's bitrate ceiling and are usually encrypted with AACS. A converted M2TS is just the unencrypted stream at whatever bitrate your chosen quality preset produces, so it's typically smaller and plays back unencrypted. To go the other direction and get a widely-shareable file, use our M2TS to MP4 converter.