WebM to MTS Converter

How to Convert WebM to MTS Online

1. Upload Your WebM File: Drag and drop your .webm clip into the upload area or click "+ Add Files" to browse. Batch is supported — queue several WebM files and convert them with the same settings.
2. Pick a Quality Preset: Default is Very High (Recommended), which targets an H.264 bitrate inside AVCHD's 24 Mbps ceiling. Choose Highest for archival workflows, High or Medium to shrink files for older players, or switch the mode to Constant Bitrate, Variable Bitrate, Constant Quality, Constraint Quality, or Specific file size if you need to hit a target Mbps or MB number exactly.
3. Resize and Trim (Optional): Under Video resolution, keep the original dimensions, choose a Preset Resolution (1920×1080, 1440×1080, 1280×720 — the three sizes AVCHD officially supports), scale by Resolution Percentage, or enter custom Width × Height. Open Trim and set a Time Range if you only need part of the clip.
4. Convert and Download: Click Convert. The job runs on our servers — no sign-up, no watermark, uploaded only to xconvert’s own servers, auto-deleted after a few hours. Download the .mts file when it finishes.

Why Convert WebM to MTS?

WebM is Google's open container for VP8/VP9/AV1 video — perfect for the web, but a non-starter for the AVCHD camcorder world. MTS is the file extension Sony and Panasonic chose in 2006 when they jointly launched AVCHD, an MPEG-2 Transport Stream container carrying H.264/AVC video and Dolby AC-3 (or LPCM) audio. Consumer Handycams, Lumix camcorders, and Blu-ray recorders expect MTS in a specific BDMV folder layout; drop a WebM in there and the device won't index it. Converting bridges the two ecosystems.

• Importing web footage into an AVCHD editing project — Premiere Pro, Vegas Pro, EDIUS, and PowerDirector all have dedicated AVCHD ingest paths that prefer H.264-in-MPEG-TS over VP9-in-Matroska.
• Adding clips to a Sony or Panasonic camcorder SD card — Restoring deleted footage or merging screen-recorded WebM B-roll into a PRIVATE/AVCHD/BDMV/STREAM/ folder so the camcorder treats it as a native clip.
• Authoring AVCHD discs for Blu-ray players — Many standalone Blu-ray players read AVCHD-burned DVDs but reject .webm; MTS is the path to disc playback.
• Sending footage to a video editor working in an AVCHD pipeline — Wedding, real-estate, and event editors often standardize on AVCHD so multi-camera timelines stay frame-accurate.
• Long-term archive with Dolby AC-3 5.1 surround — WebM's Opus/Vorbis tracks are stereo in most exports; AC-3 in MTS preserves 5.1 channel layouts at 64–640 kbps.
• Hardware playback on older 1080p TVs and media boxes — Many 2010-era TVs and PVRs have AVCHD/MPEG-TS decoders but no VP9 silicon.

WebM vs MTS — Format Comparison

Quality Preset & Bitrate Guide

If you need the reverse direction or a different output container, see MTS to MP4, WebM to MP4, or WebM to MOV. To slim the source first, try Compress WebM before re-encoding.

Frequently Asked Questions

Will my camcorder play the MTS file I created?

It depends on the device. AVCHD-compliant Sony Handycams, Panasonic Lumix camcorders, and Blu-ray recorders index files by walking the BDMV folder tree (PRIVATE/AVCHD/BDMV/STREAM/ on most SD cards), and they look for 8.3-style filenames like 00000.MTS. Even a perfectly encoded MTS won't appear in the on-camera library unless it lives in that folder with that naming. The converted file plays fine in VLC, MPC-HC, and any NLE that imports AVCHD, but for camcorder playback you must mirror the original BDMV structure manually.

MTS vs M2TS — which extension should I use?

They're the same MPEG-2 Transport Stream container. Sony/Panasonic camcorders write .MTS to the SD card during recording, and the manufacturer's import tools rename to .m2ts once the file lands on a computer — typically also adding the original timestamp and a header copied from the CLIPINF sidecar. xconvert outputs .mts; renaming to .m2ts is safe and reversible.

Why is my MTS file larger than the WebM source?

WebM almost always carries VP9 or AV1, both of which are 25–50% more efficient than H.264 at the same visual quality. MTS is locked to H.264 by the AVCHD spec, so the encoder needs more bits to match what VP9/AV1 did with fewer. Pick the High or Medium preset, or switch to Variable Bitrate with a lower average, to claw back some size. A 1080p H.264 encode at 12–15 Mbps usually looks indistinguishable from the WebM at half the source bitrate.

Can I keep 5.1 surround sound from a WebM with Opus audio?

If the source actually has a 5.1 Opus track (most YouTube downloads and screen recordings are stereo), the converter remaps to AC-3 5.1 at up to 640 kbps — AC-3 is the AVCHD spec's surround codec and Dolby Digital 5.1 is what your Blu-ray receiver expects. Stereo Opus stays stereo; the converter doesn't synthesize channels that aren't there.

Does AVCHD support 4K or only 1080p?

AVCHD tops out at 1920×1080. Sony's 4K consumer format is XAVC S (uses an MP4 container), and the prosumer variant is XAVC. If you need 4K out of a camcorder workflow, MTS is the wrong target — use WebM to MP4 with an H.264 or H.265 codec instead. The converter will still let you select 2160p inside an MTS file, but the result is technically non-compliant AVCHD and may be rejected by camcorders and disc players.

Why does my NLE show "interlaced" when the WebM was progressive?

AVCHD 1.0 (2006) defined 1080i and 720p modes; progressive 1080p (50p/60p) only arrived with AVCHD 2.0 in 2011. Some editors default to flagging any 1080-line MTS as interlaced unless the stream metadata explicitly says progressive. Re-importing with the right interpretation, or letting your NLE detect field order on the first frame, usually fixes the preview.

Will the conversion strip my WebM's alpha channel?

Yes — VP8 and VP9 in WebM can carry an alpha channel for transparent overlays, but H.264 inside AVCHD has no alpha support at the consumer profile level. The alpha is flattened against black (or your chosen background color) before encoding. If you need to preserve transparency, MTS is not the right destination; export to a ProRes 4444 or VP9-alpha workflow instead.

What's the difference between AVCHD MTS and a generic .ts broadcast stream?

Both use MPEG-2 Transport Stream packets. A broadcast .ts typically carries multiple programs, DVB-style PSI tables, and may use MPEG-2 video; AVCHD MTS carries a single program with H.264 video, AC-3 or LPCM audio, and adds AVCHD-specific clip-information (CPI) tables that camcorders and disc players index against. Generic .ts files won't appear in a Handycam's clip list even if you put them in the BDMV folder.

Can I burn the MTS straight to a DVD for a Blu-ray player?

Often yes — many Blu-ray players (and a surprising number of upscaling DVD players) recognize AVCHD-on-DVD if you author the disc with the correct BDMV folder layout and stay within the 18 Mbps DVD bitrate cap. Tools like multiAVCHD or tsMuxeR build the folder structure; the MTS files xconvert produces drop straight into BDMV/STREAM/. Choose the High preset (12–15 Mbps) to comfortably fit inside the DVD limit.