Free · No Upload · Instant

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

Convert MP4 to MTS online for free. Fast, private MPEG-4 Video to AVCHD 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 MP4 to MTS

Upload your MP4 file by clicking "Choose Files" or drag and drop it.

Select MTS as the output format.

Click "Convert Now" and download your converted file.

About MP4 Format

Extension: .mp4
Full name: MPEG-4 Video

About MTS Format

Extension: .mts
Full name: AVCHD Video

Frequently Asked Questions

Is it safe to convert MP4 to MTS 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 MP4 to MTS?

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 MP4 to MTS 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 MP4 file, and download the converted MTS file.

Will I lose quality converting MP4 to MTS?

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 MP4 files to MTS?

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

What is the difference between MP4 and MTS?

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

Why Convert MP4 to MTS?

Advantages

✓AVCHD 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

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

Related Conversions

MP4AVI MP4MKV MP4MOV MP4WMV MP4FLV MP4WEBM MP4MTS AVIMTS MKVMTS MOVMTS WMVMTS FLVMTS

Explore More

.mp4

MP4 Converter

All MP4 conversions

.mts

MTS Converter

All MTS conversions

MP4 vs MTS

Compare formats

Convert to MTS

All sources → MTS