3G2 to MTS Converter

3G2 vs MTS — Which One Do You Actually Want?

.3g2 is a mobile container: the 3GPP2 file format that CDMA2000 handsets — the Verizon and Sprint generation of feature phones — recorded to. .mts is the on-camera name for AVCHD, the HD camcorder format Sony and Panasonic put together in 2006 and still the native recording format of a lot of Sony, Panasonic, Canon and JVC hardware. Converting between them is a narrow, deliberate job. The short answer: convert 3G2 to MTS only when the clip has to sit on an AVCHD editing timeline next to real camcorder footage. For anything you want to play, send, upload or keep, 3G2 to MP4 is the conversion you are looking for, because MP4 opens everywhere and MTS does not.

Side-by-side Comparison

When Converting 3G2 to MTS Makes Sense

• You are cutting old phone clips into camcorder footage: an AVCHD project that already ingests .mts from a Sony or Panasonic camera will accept a converted clip in the same shape instead of forcing a mixed-format timeline.
• Your NLE prefers a transport stream: some camcorder-oriented editors and capture utilities are noticeably happier with MPEG-2 transport streams than with mobile MP4-family files.
• You need Dolby Digital audio on the timeline: AVCHD specifies Dolby Digital (AC-3) and Linear PCM, which is what an AVCHD-aware editor expects to find on the audio track.
• You are feeding hardware that reads AVCHD folders: some players, decks and TV media readers look specifically for AVCHD-style streams and will not open a mobile container at all.

When to Pick MP4 (or MKV) Instead

• You just want the clip to play: MP4 works on phones, smart TVs, browsers, messaging apps and every social platform. MTS effectively does not — even VLC-class players are the exception rather than the rule on consumer devices.
• You are archiving, not editing: an open, well-specified container with room for extra tracks is the better long-term home. 3G2 to MKV gives you Matroska for that.
• You care about file size: AVCHD is a high-bitrate capture format built for HD cameras. Wrapping a 176x144 phone clip in it buys nothing and can cost you disk space.
• You want to post it somewhere: hardly any web service accepts .mts directly, while .mp4 is accepted virtually everywhere.

What an MTS File Is Allowed to Contain

Source for the AVCHD rows: the official AVCHD format specification page published by the AVCHD Format Co-Promoters.

How to Convert 3G2 to MTS

1. Upload Your 3G2 File: Drag and drop the clip onto the page or click "+ Add Files" to browse. .3gp files are accepted too, and several clips can be queued to run with the same settings.
2. Keep Video Codec on H.264: Under Advanced Options, H.264 is the codec AVCHD is built around and the one this converter writes. The AVCHD specification has no place for H.265, VP9 or AV1, so picking one produces a transport stream most camcorder software will refuse to import. On the audio side the output carries AAC by default, which most players and editors read fine; switch Audio Codec to AC3 if a strict AVCHD importer insists on the Dolby Digital audio the specification calls for.
3. Set Video resolution and Trim: Choose "Keep original" under Video resolution rather than reaching for a 1080p preset — a phone frame has no HD detail to recover — and use Trim's Time Range if you only need a section of the clip.
4. Convert and Download: Click Convert and save the .mts. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours later — no sign-up, no watermark.

Frequently Asked Questions

Why would I convert 3G2 to MTS instead of MP4?

Almost the only good reason is an editing timeline. MTS is the container an AVCHD camcorder writes, so if you are cutting old phone footage into a project that already ingests .mts clips from a Sony, Panasonic, Canon or JVC camera, matching the format keeps the timeline uniform. For playback, messaging, uploading or archiving, MP4 wins on every count — it opens on effectively every phone, browser, TV and app, while .mts mostly opens in VLC and in editing software.

Will converting to MTS make my old phone video look HD?

No. AVCHD supports frame sizes up to 1920x1080, but supporting a resolution is not the same as containing one. A CDMA-era clip was captured at something like 176x144 or 352x288, and choosing a 1080p preset just stretches those pixels across a bigger canvas — softer, blockier, larger on disk, no extra detail. Set Video resolution to "Keep original" and let your editor scale the clip on the timeline if the project needs it there.

What video and audio codec does the MTS output use?

H.264 video with AAC audio by default, muxed into an MPEG-2 transport stream. H.264 is exactly what the AVCHD specification lists for video. On the audio side the specification names Dolby Digital (AC-3) or Linear PCM rather than AAC, so if a strict AVCHD importer rejects the sound track, switch Audio Codec to AC3 and convert again — that produces the spec-exact pairing. H.265, VP9, AV1 and the other modern codecs are not part of AVCHD at all, so putting one inside an .mts file produces something most camcorder tooling will refuse even though the extension looks right.

Why does the audio sound like a phone call after conversion?

Because that is how it was recorded. Most feature-phone .3g2 clips carry AMR-NB or a CDMA vocoder — EVRC, EVRC-B, 13K (QCELP), SMV or VMR-WB — all designed for telephone-band speech rather than music. Re-encoding that to AAC — or AC-3, if you switched the Audio Codec — preserves the speech faithfully, but no codec, bitrate or sample rate can rebuild frequencies the vocoder never encoded. If the clip is a voice memo, that is fine. If it is a concert recorded on a 2006 flip phone, the fidelity was never there.

Is MTS the same thing as M2TS or AVCHD?

They are close relatives, not synonyms. AVCHD is the format; MPEG-2 Transport Stream is the container it uses; .mts and .m2ts are two file extensions for that stream. Camcorders typically write .mts on their own media and .m2ts inside the AVCHD folder structure when copied or authored to Blu-ray-style discs. The bytes are the same kind of transport stream, which is why a tool that reads one usually reads the other.

Can I convert a whole folder of old 3G2 clips in one pass?

Yes — queue them together and they run with the same settings, which is the point when you are digitizing a phone's worth of footage. Every clip gets the same codec, resolution and trim treatment, so if some clips need different handling, split them into separate batches. There is a real practical limit, and it is upload size and time over your connection rather than anything on the conversion side.

My file is a .3gp, not a .3g2 — does this still work?

Yes. .3gp and .3g2 are the same ISO base media structure defined by two sibling standards bodies: 3GPP for GSM/UMTS phones, 3GPP2 for CDMA2000 phones. The main difference is the audio codec menu — 3G2 adds EVRC, EVRC-B, EVRC-WB, 13K (QCELP), SMV and VMR-WB. This page accepts both, and the 3GP to MTS converter covers the GSM twin if you would rather work from that page.

How are my files handled, and can I convert MTS back the other way?

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. Going the other direction, from a camcorder .mts down to a small mobile container, is handled by the MTS to 3G2 converter; to bring camcorder footage into something more portable instead, the MTS converter hub lists the other targets.