Reset to defaults
Need help?Convert MTS camcorder recordings (AVCHD) online, free. Upload the .mts files from your camera's AVCHD folder and choose the output under Video File Extension: MP4 is selected by default and plays everywhere; MOV, MKV, WebM, AVI, WMV, M2TS, TS and two dozen more are one click away. For the most common job use the dedicated MTS to MP4 converter.
How to convert MTS files
- Upload your MTS files: Click Upload or drop the .mts files on the page. Batch is supported, so a whole shoot converts with the same settings.
- Pick an output format: Keep MP4 or choose another entry under Video File Extension. The codec follows the container (H.264 for MP4), the quality preset is Very High and the resolution stays as recorded; open Show All Options to change any of them, set a size target or trim.
- Convert and download: Click Convert, then download each file or the batch as a ZIP.
Video File Extension
The list holds 3G2, 3GP, ASF, AV1, AVCHD, AVI, DivX, F4V, FLV, HEVC, M2TS, M2V, M4V, MJPEG, MKV, MOV, MP4 (default), MPEG, MPEG2, MPG, MTS, MXF, OGV, RM, RMVB, SWF, TS, VOB, WebM, WMV, WTV and Xvid. MP4 is the right choice for playback and sharing; MOV for Final Cut Pro and other Apple editors; MKV when you want several audio or subtitle tracks later; WebM for HTML5 embeds; AVI for older Windows tools; M2TS or TS for disc and broadcast workflows. This page outputs video only; to pull the sound track out as audio use MTS to MP3.
Video and audio codec
The codec is chosen to match the container: H.264 with AAC audio for MP4, MOV, MKV, M2TS and TS; VP9 with Opus for WebM; MPEG-4 with MP3 for AVI; MPEG-2 with MP2 for MPEG, MPG and VOB; WMV2 for WMV. Under Show All Options you can change either one — for an MP4, H.265 gives a smaller file at the same quality on devices that decode it, and AV1 smaller still. The video is always re-encoded; there is no stream-copy mode.
Quality Preset, size targets and CRF
File Compression starts on Quality Preset with Very High (Recommended), which for H.264 is CRF 18. Switch to Target file size (%) (slider, starting at 80), Specific file size (a number in B, KB or MB, starting at 24 MB), Constant Bitrate (starting at 4 Mbps), Variable Bitrate (4 Mbps within a 2 to 8 Mbps range), Constant Quality (CRF 16 to 51, starting at 23) or Constraint Quality (CRF plus a maximum bitrate). AVCHD records at up to 24 or 28 Mbps depending on the camera, so even the Very High preset usually produces a smaller file than the camcorder wrote.
Resolution and trim
Video resolution defaults to Keep original. Choose Resolution Percentage, a preset from 4320p down to 144p, or an exact width, height or both; the manual controls are hidden while Auto Scale is active with a size target. Trim takes a start time and a duration in seconds or HH:MM:SS.sss, so you encode only the part of the clip you need.
Output: what to expect
An MP4 at the Very High preset is visually indistinguishable from the AVCHD source in normal viewing, but it is a fresh encode, not a copy. The camcorder's AC-3 or PCM audio is re-encoded to AAC unless you choose another codec. Clip-info and playlist files that sit next to the .mts in the AVCHD folder are not carried over; the picture and sound are.
Frequently Asked Questions
Which format should I convert MTS to?
MP4 unless you have a reason not to: it keeps H.264, plays on phones, browsers, TVs and in every editor. Choose MOV for Apple editing, MKV for multi-track libraries, WebM for the web and M2TS for disc authoring.
Is converting MTS to MP4 lossless?
No. The video is re-encoded, with H.264 at CRF 18 by default, so the result looks the same in normal viewing but is not bit-for-bit identical. Keep the original .mts files if you need an archive copy.
Why is one long recording split into several MTS files?
AVCHD cameras write to FAT32-formatted cards, which cap a single file at 4 GB, so a long take is spanned across sequential .mts files. Each segment is a complete clip: convert them all in one batch and join the MP4s in your editor.
Can I convert a whole shoot at once?
Yes. Upload all the .mts files together; the same format and settings apply to each, and you can download them one by one or as a ZIP.
Are my files private?
Files are uploaded over an encrypted connection, processed on our servers and deleted automatically after a few hours. Nothing is shared or indexed.
Related tools
- MTS to MP4 — the dedicated page for the most common conversion
- MTS to MOV — for Final Cut Pro and Apple workflows
- MTS to MKV — multi-track media-server libraries
- MTS to MP3 — extract the audio track
- M2TS Converter — the disc twin of MTS