Extract audio from AVCHD camcorder video and save as MP3. Adjust bitrate, trim, and download instantly.

How to Convert AVCHD to MP3 Online

1. Upload Your AVCHD File: Drag and drop or click "Add Files" to select your.avchd,.mts, or.m2ts camcorder recording. Batch upload is supported, so a folder of clips from one shoot can be queued together.
2. Pick a Quality Preset or Bitrate: Default is the Highest quality preset. For voice or interview audio, drop to Medium or Low. For more control, switch to Custom Bitrate and type any value in kbps, or use Constant Bitrate (32-320 kbps presets) for predictable file sizes, or Variable Bitrate for smaller files at equivalent perceived quality.
3. Tune Channels, Sample Rate, and Trim (Optional): Audio Channel defaults to Original — pick Stereo to force a downmix from 5.1, or Mono to halve the bitrate again. Audio Sample Rate stays at Original (typically 48 kHz from camcorders) unless you need 44.1 kHz for CD or 22.05 kHz for voice. Under Trim, set a Start Time and Duration in seconds or HH:MM:SS.sss to extract a single scene.
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Why Convert AVCHD to MP3?

AVCHD (Advanced Video Coding High Definition) was introduced by Sony and Panasonic in 2006 for HD consumer camcorders and stores its audio as Dolby Digital (AC-3) at 64-640 kbit/s with 1-5.1 channel modes, or as linear PCM on professional models. The video track is rarely needed when you only want the sound — extracting to MP3 strips out a 4-12 GB per hour H.264 stream and leaves a 60-150 MB stereo file that plays anywhere.

• Wedding and event audio archives — A two-hour ceremony shot on a Panasonic HC-V770 or Sony HDR-CX405 lands as a 14-20 GB AVCHD folder. Extract the audio to MP3 at 192 kbps and the entire ceremony fits in ~170 MB — small enough to email or store on the family Google Drive.
• Podcast and interview source files — Camcorders give you better-than-phone audio thanks to onboard shotgun mics. Pull the AC-3 track to MP3 and drop it straight into Audacity, Descript, or Adobe Audition for editing.
• Rehearsal and lecture recordings — A 90-minute band rehearsal or classroom lecture at 128 kbps mono MP3 is around 85 MB, fitting comfortably under the 25 MB Gmail attachment limit when split into thirds.
• Sermon, lecture, and language-learning playback — Strip the video so the file plays on iPods, basic MP3 players, car USB stereos, and entry-level Android phones that may not decode AVCHD natively.
• Background music capture from concert footage — Set Trim to isolate one song, choose 256-320 kbps Constant Bitrate, and keep a clean audio-only copy without re-encoding the surrounding video.
• Transcription workflow — Whisper, Otter.ai, and Rev all accept MP3 directly. Converting first means you upload kilobytes instead of gigabytes, and transcription credits often charge by file size or duration.

AVCHD vs MP3 — Format Comparison

MP3 Bitrate Quick Guide

Frequently Asked Questions

What bitrate should I use for camcorder audio?

AVCHD typically records AC-3 at 256-384 kbit/s for stereo and up to 640 kbit/s for 5.1. Since MP3 re-encoding loses some quality at every step, match or slightly exceed the source: pick 256 kbps for music-heavy footage, 192 kbps for general events, and 128 kbps for dialogue or interviews. Going above 320 kbps gives diminishing returns because of MP3's psychoacoustic ceiling.

Will I lose audio quality compared to the original AC-3 track?

Yes — both AC-3 and MP3 are lossy, so converting between them is a transcode that compounds artifacts. For archival, extract to a lossless format instead with AVCHD to WAV or keep the original surround track with AVCHD to AC3. MP3 is the right choice when you need universal playback rather than mastering-grade audio.

What is the difference between AVCHD, MTS, and M2TS?

AVCHD is the format specification jointly developed by Sony and Panasonic. MTS is the file extension used by camcorders for in-camera recordings, and M2TS is the same MPEG-2 Transport Stream container after it's copied to Blu-ray or a computer — Sony often renames.mts to.m2ts when imported via PlayMemories. All three carry the same H.264 video and AC-3 (or LPCM) audio, and this tool accepts any of them. For the.mts variant specifically, see MTS to MP3; for .m2ts files the workflow is identical.

How do I extract audio from just one scene?

Use the Trim section. Set Start Time to the timestamp where you want the audio to begin (for example, 00:05:30 for five and a half minutes in) and Duration to the length you want to capture. For longer projects with multiple cuts, run the full conversion first and split the resulting MP3 with Audio Cutter, which lets you mark unlimited segments.

Does this preserve 5.1 surround sound?

No — MP3 is a stereo format only (with limited mono support). If the source AVCHD contains 5.1 AC-3, the conversion downmixes to stereo using standard ITU-R BS.775 weights (front L/R full, center -3 dB, surrounds -3 dB, LFE dropped). To keep the discrete surround channels, convert with AVCHD to AC3 instead, which is lossless within AC-3.

My camcorder file plays in VLC but not in QuickTime — why?

QuickTime stopped shipping native AC-3 support in macOS, and Windows Media Player removed it earlier. AVCHD files often fail to open or play silently because the audio codec isn't installed even when the H.264 video decodes. Converting to MP3 sidesteps the problem entirely since MP3 decoders are baked into every operating system shipped since the late 1990s.

What sample rate should I pick?

Leave it on Original (48 kHz, which is what camcorders record). Drop to 44.1 kHz only if you're burning a traditional audio CD or matching a DAW session locked to that rate. Sample rates below 22.05 kHz audibly cut high frequencies and should only be used for voice-only archives where file size matters more than fidelity.

Can I batch convert a whole folder of MTS files?

Yes — drag the entire folder onto the upload area or shift-select multiple files. Each clip processes independently and downloads as its own MP3. The settings you choose apply to every file in the batch, so set Quality Preset and Audio Channel once and the same recipe runs across all of them.

Is there a file size limit?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — the practical limit is upload size and connection speed, not a per-file cap. A multi-gigabyte AVCHD recording converts without issues; no watermark, no sign-up required.