Remux Video
Change a video’s container (MKV → MP4, MOV, TS) without re-encoding — lossless and near-instant.
Why remux video containers (MKV, MP4, MOV, TS) losslessly?
Swapping video file wrappers without spending minutes re-encoding frames or losing visual quality is an essential video editing utility:
- Remux OBS Studio MKV Recordings to MP4: Instantly convert crash-safe OBS MKV screen recordings into editor-compatible MP4 files.
- 100% Bit-for-Bit Lossless Stream Copying: Copies underlying H.264/H.265 video and AAC audio bitstreams directly with zero generational quality loss.
- Near-Instant Execution Speed: Remuxing a 1 GB video file finishes in just a few seconds because no CPU frame rendering is required.
- 100% On-Device Browser Security: Remux video containers locally without uploading private video recordings to cloud servers.
FFmpeg WebAssembly stream copy remuxing engine
ToolJiffy uses a high-performance client-side FFmpeg WebAssembly pipeline:
The engine demuxes input container packets in browser memory and remuxes video and audio packets (using -c copy) directly into your target container wrapper (MP4, MKV, MOV, TS).
Client-side security for private video files
Uploading private family videos, corporate presentation recordings, or unreleased content to third-party cloud video tools creates severe privacy risks.
ToolJiffy operates on a zero-cloud architecture. By leveraging client-side WebAssembly, video remuxing runs 100% locally in your browser memory. Your video files never touch external cloud servers.
Step-by-step guide to remuxing video containers
- Upload video: Drag & drop any MKV, MP4, MOV, or TS file into the box above.
- Select target container: Choose MP4, MKV, MOV, or TS format.
- Remux & Download: Click Remux Video to process and save your file in seconds.
Explore related video editing & conversion utilities
If your video codecs require full re-encoding, use Video Converter, mute audio with Mute Video, package for streaming with Video to HLS Converter, or compress files using Video Compressor.
Frequently Asked Questions
What is video remuxing and how is it different from video conversion?
Remuxing changes a video’s container format wrapper (e.g. converting MKV to MP4, MOV, or TS) by copying video and audio streams bit-for-bit without re-encoding. Video conversion re-encodes video pixels, which takes minutes and reduces quality. Remuxing finishes in seconds with zero quality loss.When does video remuxing work?
Remuxing works whenever the target container format supports the underlying codecs stored inside your input file (for example, MKV files containing H.264 video and AAC audio remux instantly to MP4).Is my video file uploaded to any cloud server during remuxing?
No, 100% private. Container demuxing and stream remuxing take place locally inside your browser memory using FFmpeg WebAssembly. Your videos never touch external cloud servers.Why is remuxing OBS Studio MKV recordings to MP4 so popular?
OBS Studio records in MKV format to prevent file corruption during computer crashes. However, video editing software (Adobe Premiere, DaVinci Resolve) and web browsers require MP4. Remuxing converts the container wrapper in seconds.What target container formats can I select for remuxing?
ToolJiffy supports remuxing to MP4, MKV, MOV, and MPEG-TS containers.What happens if codecs inside my video file are incompatible with the target container?
If codecs inside the source file are incompatible with the target container (e.g. VP9 video inside WebM into MP4), ToolJiffy will notify you to use our Video Converter tool to re-encode the stream.Does remuxing alter audio quality or subtitle tracks?
No. Audio streams and subtitle tracks supported by the target container are copied bit-for-bit losslessly.Is ToolJiffy Remux Video free to use without limits or watermarks?
Yes! ToolJiffy is 100% free with unlimited usages, zero account sign-ups, and zero watermarks.