MTS to MP4 Converter

The AVCHD Problem

MTS files come from AVCHD camcorders made by Sony (Handycam), Panasonic (HC series), and Canon (VIXIA/LEGRIA). These cameras were hugely popular from 2006 to 2015, and millions of families have hours of footage in MTS format sitting on SD cards or hard drives. The problem: MTS uses an MPEG-2 Transport Stream container that most computers, phones, and modern devices simply cannot open without specialized software.

On Windows

Windows Media Player and the Movies & TV app have no native MTS support. Double-clicking an MTS file typically opens a "How do you want to open this file?" dialog or attempts playback with garbled video. Some camera manufacturers bundled PlayMemories (Sony) or HD Writer (Panasonic) software, but these are discontinued and don't work on Windows 10/11. Converting to MP4 makes your camcorder footage playable in any Windows application.

On Mac

macOS QuickTime Player cannot open MTS files. Earlier macOS versions had limited AVCHD import support through iMovie, but this has become increasingly unreliable. The Finder cannot generate thumbnails or previews for MTS files. Quick Look shows nothing. Converting MTS to MP4 gives you full macOS integration — previews, thumbnails, QuickTime playback, and easy import into iMovie or Final Cut Pro.

On Phones & Tablets

Neither iOS nor Android can play MTS files natively. If you transfer camcorder footage to your phone, the gallery app won't recognize it, you can't share it via Messages or WhatsApp, and social media apps won't accept it for upload. MP4 is the only video format that works universally across all mobile devices, messaging apps, and social platforms.

What is MTS?

MTS is the file extension for AVCHD (Advanced Video Coding High Definition), a format jointly developed by Sony and Panasonic in 2006. It was designed specifically for consumer HD camcorders, storing H.264/AVC video inside an MPEG-2 Transport Stream (.mts) container.

AVCHD camcorders record MTS files into a specific folder structure on the memory card: PRIVATE/AVCHD/BDMV/STREAM/. The files are typically named sequentially (00000.MTS, 00001.MTS, etc.) with accompanying index and playlist files that the camcorder uses for navigation.

MTS supports 1080i (interlaced) and 1080p (progressive) video at various bitrates, with Dolby Digital (AC-3) or LPCM audio. While the video codec inside (H.264) is modern, the MPEG-2 Transport Stream container and the AVCHD folder structure make these files incompatible with most modern software and devices. The format was essentially obsoleted by smartphones with built-in cameras that record directly to MP4.

What is MP4?

MP4 (MPEG-4 Part 14) is the international standard video container format, published as ISO/IEC 14496-14. It was derived from Apple's QuickTime MOV format in 2001, using the same atom/box architecture for organizing video, audio, and metadata.

MP4 supports H.264 and H.265 video with AAC audio, and includes the faststart flag (moov atom at the beginning) for instant web playback without buffering. It's the recommended upload format for YouTube, Instagram, TikTok, Facebook, and every major platform.

The defining strength of MP4 is universal compatibility. Every computer, phone, tablet, smart TV, gaming console, web browser, and media player manufactured in the last 15 years can play H.264 MP4 files. When you need a video that works everywhere without question — especially old camcorder footage you want to share with family — MP4 with H.264 is the safe choice.