M2TS to MP4 Converter

How to Convert M2TS to MP4 Online

1. Upload Your M2TS File: Drag and drop or click "Add Files" to load .m2ts streams pulled from a Blu-ray disc, AVCHD camcorder (Sony / Panasonic / Canon), or digital TV recording. Batch is supported — drop in the entire BDMV/STREAM folder and each clip converts in parallel.
2. Pick Quality Preset or Compression Mode: Default is "Very High (Recommended)" Quality Preset, which targets visually-lossless H.264 output. Switch to Specific file size to cap output at an exact MB target, Constant Bitrate for predictable streaming sizes, Variable Bitrate for smaller files at the same quality, Constant Quality for CRF-based encoding (18 = visually lossless, 23 = default, 28 = noticeably smaller), or Constraint Quality for CRF with a max-bitrate ceiling. The Video Codec dropdown defaults to H.264 — switch to H.265/HEVC for roughly 40% smaller files at the same perceived quality, or AV1 for the smallest output at the cost of slower encoding.
3. Resize or Trim if Needed (Optional): Under Video Resolution, keep original, pick a Preset Resolution (2160p / 1440p / 1080p / 720p / 480p / 360p / 240p), scale with Resolution Percentage, or enter custom Width × Height (aspect ratio locks unless you choose Width × Height explicitly). Under Trim, pick Time Range and enter Start Time + Duration in seconds or HH:MM:SS.sss to extract one scene from a long Blu-ray rip.
4. Convert and Download: Click Convert. Files process in your browser session — no sign-up, no watermark, no email required. Download individually or as a ZIP.

Why Convert M2TS to MP4?

M2TS is the BDAV MPEG-2 Transport Stream container — the format Blu-ray discs use on the disc itself, and the format AVCHD camcorders (jointly developed by Sony and Panasonic in 2006) write to SD card and internal memory. On a Blu-ray disc, M2TS holds H.264, MPEG-2, or VC-1 video plus Dolby Digital, DTS, or LPCM audio at up to 40 Mbit/s. AVCHD camcorders are more restrictive — H.264 video plus AC-3 or LPCM audio, typically at 17-24 Mbit/s for 1080p. Both produce files most consumer devices, browsers, and editors won't open directly. MP4 (ISO/IEC 14496-14) is the universal alternative: it holds the same H.264 video stream without re-encoding, plays on every modern device, and is the required format for most uploads.

• Make AVCHD camcorder footage editable — Camcorders write M2TS into a nested BDMV/STREAM folder structure. iMovie, Premiere Pro, DaVinci Resolve, CapCut, and Final Cut Pro all accept MP4 cleanly; M2TS sometimes requires an import wrapper or proxy generation step. Converting up front removes that friction.
• Play Blu-ray rips on phones, tablets, and smart TVs — Phones and most non-Blu-ray smart TVs can't open .m2ts directly. MP4 with H.264 plays on every iPhone since 4S, every Android phone made in the last decade, Roku, Chromecast, Fire TV, Apple TV, and every modern browser.
• Upload to YouTube, Vimeo, social platforms — YouTube accepts MP4 natively and processes it faster than M2TS. Instagram, TikTok, X, Facebook, and LinkedIn require MP4 (or transcode M2TS server-side with quality loss). Converting first puts you in control of the encode settings.
• Shrink Blu-ray rips dramatically — A 1-hour Blu-ray M2TS at 30-40 Mbit/s lands around 12-18 GB. Re-encoding to MP4 with H.264 at CRF 20 typically produces a 2-4 GB file with no visible quality loss; H.265 cuts that roughly in half again.
• Email or message the clip — Raw M2TS is too large for almost every attachment system (Gmail 25 MB, Outlook.com 33 MB, iCloud Mail 20 MB, Discord free 10 MB). MP4 with a sensible CRF or a Specific file size target fits within those caps without manually splitting the clip.
• Long-term archive in a stable format — MP4 has been an ISO standard since 2003. M2TS is tied to Blu-ray and AVCHD authoring tooling; if you're keeping personal video for decades, MP4 / H.264 plays back without depending on Blu-ray-specific software still existing.

M2TS vs MP4 at a Glance

Quality and Compression Mode Quick Guide

Codec Choice Quick Guide

For going the other direction (authoring an MP4 back into a Blu-ray-compatible stream), see MP4 to M2TS. If MKV is a better fit for your editor or media server (multi-audio, chapters, subtitles), use M2TS to MKV. To shrink without changing format, Compress M2TS does in-place CRF or bitrate reduction. The closely related MTS to MP4 handles AVCHD's other extension.

Frequently Asked Questions

Will converting M2TS to MP4 lose quality?

If your M2TS already contains H.264 video and AC-3 or AAC audio (true for most AVCHD camcorder output and many Blu-ray rips), the converter can remux the same streams into an MP4 container with no re-encoding — that's a lossless operation, identical to ffmpeg's -c copy. If the M2TS holds MPEG-2 or VC-1 video (older Blu-rays, DVR captures), MP4 requires re-encoding to H.264 / H.265 / AV1; set Constant Quality to CRF 18-20 to stay visually indistinguishable from the source. The Very High preset chooses sensible defaults for either case.

What's the difference between MTS and M2TS?

Both are the same MPEG-2 Transport Stream container with the same internal byte structure. AVCHD camcorders write .MTS files to the card's BDMV/STREAM folder; when the camcorder's own software or AVCHD-aware editor imports the clips to a computer, the extension is renamed to .m2ts. You can usually rename .mts to .m2ts (or vice versa) and the file still plays — the conversion to MP4 works on either extension. XConvert accepts both.

Will I keep multi-channel surround audio (5.1 Dolby / DTS)?

H.264 stream is preserved unchanged in the lossless remux path, but audio depends on what's inside. AC-3 5.1 (Dolby Digital) can stay as AC-3 in the MP4 (MP4 supports it). DTS audio is not part of the MP4 standard and will be re-encoded to AAC or AC-3 — multi-channel layout is preserved, but DTS-specific extensions (DTS-HD MA, DTS:X) are downmixed or transcoded. If you need to keep DTS bit-exact, convert to MKV instead with M2TS to MKV.

Which video codec should I pick for a Blu-ray rip?

H.264 if the rip is going to be shared widely or played on TV / phone / older hardware — it's the universal default and the same codec the Blu-ray already used, so the encode is fast. H.265 (HEVC) if you want roughly 40% smaller files at the same perceived quality and your audience is on Apple devices since iPhone 6, Android 9+, or any TV/streaming box from 2017 onward. AV1 produces the smallest files but encoding is significantly slower and decode support is still narrower than H.265.

How do I import AVCHD footage from a Sony / Panasonic / Canon camcorder?

Copy the entire BDMV folder from the SD card to your computer (don't just grab loose .m2ts files — sidecar metadata in BDMV/PLAYLIST helps preserve clip continuity in some editors). Then upload the .m2ts files from BDMV/STREAM to XConvert. The converter handles each clip independently and outputs one MP4 per input. If you want to splice multiple clips into one timeline, do that in your editor after conversion, or use the Video Cutter for simple stitching.

How do I shrink a multi-GB Blu-ray rip down to a sensible size?

The biggest single lever is the codec: switch from H.264 to H.265, which roughly halves the file at the same Constant Quality setting. The second lever is CRF: 18 is visually lossless, 23 is the default, and each +6 roughly halves the file size again. For a hard target, use "Specific file size" and enter your desired MB — the converter calculates the bitrate to hit that cap. Dropping resolution from 1080p to 720p saves additional space if the source content tolerates it.

Can I trim during conversion to extract just one scene?

Yes. Under Trim, select Time Range and enter Start Time and Duration in seconds (12.5) or HH:MM:SS.sss format (00:01:30.500). Trimming first skips the unwanted portion before any encoding happens, which is dramatically faster than converting a 2-hour Blu-ray rip and trimming afterward. For frame-accurate cutting or splitting into multiple segments, use Video Cutter.

Why won't VLC / my media player open the .m2ts?

VLC opens M2TS on most platforms, but some Blu-ray rips wrap the streams with AACS or BD+ disc encryption that VLC needs the libaacs / libbdplus libraries (and a key) to decrypt — without those, playback fails or you get audio-only. Once you've unencrypted with disc-ripping software (MakeMKV, AnyDVD), the resulting .m2ts plays fine and converts cleanly to MP4 here. If the file plays in VLC but won't upload anywhere, conversion to MP4 fixes the compatibility side without touching the unencrypted source.

Is there a file size limit?

XConvert handles multi-GB Blu-ray and AVCHD files. Conversion runs in your browser session, so the practical limit is your device's available memory and the upload time — there's no fixed per-file cap and no quantity limit on batch jobs. For very long full-disc rips (4+ hours, 30+ GB), trimming to the relevant chapter first or splitting with Video Cutter is faster than converting the whole stream.