MTS to FLAC Converter

Convert MTS to FLAC online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

Free to useNo file stored beyond 1 hourEncrypted over TLS 1.2/1.3No watermarks

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Maximum file size is 1GB

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

Upload your file

Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

Choose an output format

Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

Convert & download

Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

What is an MTS file?

The MTS file extension denotes a high-definition video file formatted in the Advanced Video Coding High Definition (AVCHD) format. It utilizes the MPEG-2 Transport Stream (MPEG-2 TS) container structure to encapsulate video data compressed with H.264/MPEG-4 AVC and audio in Dolby Digital (AC-3) or uncompressed LPCM. Developed jointly by Sony and Panasonic for consumer camcorders, MTS files support resolutions up to 1080p and 60 frames per second. When imported from a camera to a computer, the file extension often changes to M2TS.

How to open an MTS file

Native support for MTS varies by OS version. Windows 10 and 11 generally support AVCHD playback via the Movies & TV app, provided the necessary MPEG-2 extensions are installed. macOS plays MTS files natively in QuickTime. For editing or reliable playback across all platforms, including Linux, VLC Media Player is preferred as it handles the H.264 video and AC-3 audio streams without requiring external codec packs.

MTS Technical Info

Full Name: AVCHD Video File
Developed By: Sony & Panasonic
Initial Release: 2006
MIME Type: video/mp2t

What is a FLAC file?

The Free Lossless Audio Codec (FLAC) is an open-source audio coding format developed by the Xiph.Org Foundation that compresses digital audio without any loss of data (bit-perfect preservation). It employs linear prediction and Rice coding (Golomb-Rice) rather than the perceptual psychoacoustic modeling used in MP3 or AAC. The format structure consists of the 'fLaC' stream marker, metadata blocks (Streaminfo, Vorbis comments for tags, Seekpoints), and audio frames, typically achieving compression ratios of 50-70% compared to raw PCM WAV files.

How to open a FLAC file

FLAC enjoys extensive native support on modern platforms, including Windows 10/11, Android, and macOS (starting with macOS High Sierra). For older systems or advanced playback control, software such as Foobar2000 (Windows) or Vox (macOS) is recommended. The VLC media player is a universal solution for all operating systems, handling FLAC streams and associated metadata seamlessly.

FLAC Technical Info

Full Name: Free Lossless Audio Codec
Developed By: Josh Coalson / Xiph.Org Foundation
Initial Release: 2001
MIME Type: audio/flac

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

Convert MTS to FLAC in seconds

Every MTS to FLAC conversion runs on our servers, so your device stays fast and the output quality stays intact.

Fast, cloud-powered

No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

Secure & private

Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

Free - no account needed

Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert MTS to FLAC via API

Automate MTS to FLAC conversions in three steps: create a job, upload your file, then poll for the result.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "mts-to-flac",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "flac"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.mts

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.