Free · No Upload · Instant

Convert MTS to MP4 Free Online — Best MTS to MP4 Converter 2025

Convert MTS to MP4 online for free. Fast, private AVCHD Video to MPEG-4 Video converter — no upload, no signup. Works in your browser instantly.

Choose Files

or drag and drop files here

Max file size: 2GB

Your files are processed locally in your browser. Nothing is uploaded to any server.

How to Convert MTS to MP4

Upload your MTS file by clicking "Choose Files" or drag and drop it.

Select MP4 as the output format.

Click "Convert Now" and download your converted file.

About MTS Format

Extension: .mts
Full name: AVCHD Video

About MP4 Format

Extension: .mp4
Full name: MPEG-4 Video

Frequently Asked Questions

Is it safe to convert MTS to MP4 online?

Yes! Convert999 processes all files directly in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

How long does it take to convert MTS to MP4?

Conversion is nearly instant for most files. Large files may take a few seconds depending on your device's processing power.

Is there a file size limit?

Convert999 supports files up to 2GB. Processing happens locally, so larger files depend on your device's available memory.

Do I need to install any software?

No installation required. Convert999 works entirely in your web browser on any device.

Can I convert MTS to MP4 on my phone?

Yes! Convert999 works on any device with a web browser — iPhone, Android, iPad, or desktop. No app installation required. Simply open the converter, upload your MTS file, and download the converted MP4 file.

Will I lose quality converting MTS to MP4?

Convert999 uses high-quality conversion algorithms to minimize quality loss. For lossless formats, the conversion is exact. For lossy formats like images and audio, we use optimized settings that balance quality and file size.

Can I batch convert multiple MTS files to MP4?

Yes, Convert999 supports batch conversion. Select or drag & drop multiple MTS files and convert them all to MP4 format at once. Each file is processed locally in your browser.

What is the difference between MTS and MP4?

AVCHD Video (MTS) and MPEG-4 Video (MP4) differ in compression, compatibility, and features. MTS is optimized for its native use cases, while MP4 may offer different advantages. Visit our MTS vs MP4 comparison page for a detailed breakdown.

Why Convert MTS to MP4?

Advantages

✓MPEG-4 Video offers better compatibility with modern applications and workflows
✓Converting is completely free with no file size limits on Convert999
✓Your files never leave your device — 100% private and secure conversion
✓Instant conversion without waiting for server processing

Key Differences

→MTS (AVCHD Video) is optimized for its native use cases
→MP4 (MPEG-4 Video) may offer different compression or feature set
→Choose based on your target platform, quality needs, and file size requirements

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