How to Play M2TS / MTS Files in Your Browser (AVCHD Camcorder Footage)

You copied video off a camcorder — a Sony, Panasonic, or Canon — or pulled it from an AVCHD disc, and you've got files ending in .mts or .m2ts. Drag one into your browser and nothing happens; double-click and your media player may not know what to do either.

These are AVCHD files, and they're a specific kind of stubborn. Here's why browsers won't open them, and how to play them in a browser tab anyway — decoded locally, with no conversion and no upload.

What M2TS / MTS Files Are

.mts and .m2ts are the container format AVCHD uses — the format consumer HD camcorders record in, and a close relative of the streams on Blu-ray discs. The two extensions are essentially the same thing:

• .mts is what you see on the camcorder / SD card.
• .m2ts is the same data after importing to a computer or disc.

Under the hood it's a BDAV MPEG transport stream — a cousin of the .ts files used in broadcasting (see playing .TS files). The video inside is almost always H.264 (AVCHD), with Dolby Digital (AC-3) audio.

Here's the catch, and it's the familiar one: the video codec (H.264) is something browsers can decode — but the transport-stream container is not something the <video> tag opens as a file. So a perfectly decodable video sits locked inside a wrapper the browser won't read. (Our video formats guide covers this container-vs-codec split in full.)

The Usual Fixes — and Why They Drag

1. Convert it (the camera's software, or HandBrake)

Camcorder bundles and tools like HandBrake will transcode AVCHD to MP4. It works, but it's slow, makes a second copy, and is a chore for a whole holiday's worth of clips.

2. Upload it to an online converter

Wait for the full upload to a stranger's server — with the usual privacy and size-limit problems. Family footage really shouldn't take that trip.

3. Install VLC

VLC plays AVCHD. But it's another install, blocked on many work machines, awkward on mobile, and not a shareable link.

The Better Way: Decode AVCHD Locally, In the Browser

OnlinePlayer reads the M2TS/MTS transport stream and decodes it on your own device, right in the browser — no conversion, no upload, no install.

• Hardware decoding (WebCodecs). AVCHD's H.264 video can usually be hardware-decoded by your device, so OnlinePlayer hands it to your GPU — smooth playback, low CPU, fine with HD footage.
• Software decoding (FFmpeg in WebAssembly). Where hardware decoding isn't available, it falls back to FFmpeg compiled to WebAssembly, now running two parallel decode workers for roughly 1.8× the throughput.

Either way, the file never leaves your computer. See hardware vs software decoding for how that path is chosen.

Step-by-Step: Play Your M2TS / MTS File Now

1. Open onlineplayer.app in any modern browser.
2. Drag your .mts or .m2ts file onto the page — or click to browse. It's decoded on your device, so it needs to be a local file; if it's in a cloud drive, download it first, then drop it in.
3. It plays — locally, with nothing uploaded.

M2TS / MTS in the Browser vs. the Alternatives

	Convert (HandBrake)	Online converter (upload)	Install VLC	OnlinePlayer
Time to first frame	Minutes	Full upload first	Install + open	Instant
Privacy	Local ✅	File on their server ❌	Local ✅	Local — nothing uploaded ✅
Keeps original quality	Re-encoded	Often re-compressed	Original ✅	Original ✅
Install needed	Yes	No	Yes	No
Works on locked-down / mobile	No	Sometimes	Limited	Yes (it's a web page)

The Honest Limits

• Dolby Digital (AC-3) surround audio is downmixed to stereo, as in any browser-based player — fine for laptops and headphones.
• AVCHD clips are often split across multiple files when a recording is long; each file plays as its own segment.
• Very high-bitrate footage that can't be hardware-decoded will lean on your CPU in software, though standard 1080p AVCHD is comfortable.

FAQ

What's the difference between .mts and .m2ts? Practically none — .mts is what the camcorder writes, .m2ts is the same stream after importing. Both play the same way here.

It's straight from my Sony/Panasonic camcorder — will it work? Yes. Consumer AVCHD is H.264 in a transport stream, which decodes cleanly — on the GPU where possible, in software otherwise.

Do I need to convert it to MP4 first? No. Open it directly — no conversion, no second copy on your disk.

Can I play it from a cloud drive without downloading? No — cloud playback only handles browser-native formats, and the AVCHD container isn't one. Download the file first, then open it locally.

Bottom Line

M2TS/MTS files are AVCHD camcorder footage wrapped in a transport-stream container the browser won't open — even though the H.264 video inside is perfectly decodable. Skip the camcorder software and the uploads: open the file in a player that decodes it locally, and your footage plays in about a second.

Play your M2TS / MTS file now at onlineplayer.app →