Convert MTS to AC3
Free, fast MTS → AC3. No watermarks, no sign-up.
How to convert MTS to AC3
1. Upload MTS
Drop your MTS file into the converter above.
2. Confirm AC3
Output is already set to AC3. Adjust only if you need to.
3. Download
Convert and download your AC3 file instantly.
Format Details
MTS
MTS is the file extension used by AVCHD camcorders for HD video in an MPEG Transport Stream wrapper. Convert to MP4, MOV, or extract audio.
videoAC3
AC3 (Dolby Digital) is a lossy surround-sound audio codec used on DVDs, Blu-ray discs, and broadcast TV. Extract and convert to MP3, WAV, AAC, and other formats.
audioConverting MTS to AC3: what actually changes
MTS to AC3 is one of the conversions this site performs, but the two formats are not interchangeable containers. Here is what the file keeps, what it loses, and how to get a result you can use.
What .MTS and .AC3 each hold
.MTS is a video format built for playing, editing or re-encoding a clip, storing frames, bitrate and audio tracks. .AC3 is a audio format built for listening to or editing a recording, storing sample rate, channels and bitrate. Converting between them is a decision about which of those two jobs the result needs to do.
What changes when categories differ
This conversion keeps the sound and drops the picture: the audio track is decoded out of the .MTS container and re-encoded as .AC3 for listening to or editing a recording. Length, loudness and voice carry over; frames do not.
When this conversion is the right one
Reach for .AC3 when you need a file for listening to or editing a recording, starting from playing, editing or re-encoding a clip. If that is not what you are after, check what else .MTS converts to before committing to this target.
Tips for a clean MTS to AC3 conversion
Start from the original file
Convert the .MTS you started with, not an earlier .AC3 output. Every extra round trip costs quality and can accumulate formatting drift.
Check the real type, not the extension
Video/mp2t becomes audio/ac3. If a file was renamed rather than converted, it will fail to open — rename it back to its true extension before uploading and the conversion will recognise it.
Length decides the time
Conversion runs in real terms on duration: a few seconds of media finishes almost at once, while a full-length .MTS takes noticeably longer. Upload once and let it finish rather than retrying.
Limits worth knowing
Uploads are capped per file (30 MB, or 100 MB for video) and processed temporarily — nothing is kept as a permanent copy. For huge video files, split or compress the source first.
Frequently Asked Questions
How do I convert MTS to AC3?
Upload your MTS file on Convertek, select AC3 as the output format, then click Convert. Your AC3 file will be ready to download instantly.
Is the MTS to AC3 converter free?
Yes. Converting MTS to AC3 on Convertek is completely free with no watermarks. Fair upload limits apply (typically 30 MB per file).
Is my file kept after conversion?
No. Files are processed temporarily and not stored permanently. Converted downloads are available only in your browser session.
What is the difference between MTS and AC3?
MTS and AC3 are different file formats with distinct use cases. Converting between them lets you use your file in software or workflows that require the AC3 format.