Free Video Remuxer Online
Change MP4, MKV, MOV or TS packaging without re-encoding compatible streams. Check target codec support and exported playback.
Locally chosen video is processed in your browser via FFmpeg WebAssembly. The engine downloads on first use; optional cloud import fetches from its provider. See the privacy policy for site analytics and ads.
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:
- MKV to MP4: Copy supported video/audio streams into a wrapper a target player or editor accepts.
- No re-encoding: Stream copy avoids a new lossy generation, while the container, timestamps or selected tracks may change.
- Device limits: This browser workflow downloads the engine on first use and requires enough memory for the file.
FFmpeg WebAssembly stream copy remuxing engine
ToolJiffy uses a 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.
A video selected from your device is processed in your browser by FFmpeg WebAssembly. The engine downloads on first use, optional cloud import fetches the chosen file, and site analytics or ads may make network requests. See the privacy policy for details.
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 & check: Click Remux video, save the output and confirm that its video, audio and any needed tracks play in your target app.
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.
How to Remux Video Containers Online Losslessly
- Choose Video File: Select or drag an MKV, MP4, MOV, WebM, TS, AVI or M4V file up to 500 MB. Available browser memory can limit large files.
- Select Output Container: Choose MP4, MKV, MOV, or MPEG-TS. The engine applies stream copy mode (-c copy) without re-encoding frames.
- Remux & Download: Click 'Remux video', download the file and check playback and track selection in your target player. Processing time varies.
Supported Inputs & Output Formats
| Type | Format | Details & Handling |
|---|---|---|
| Input | Video Files (MKV, MP4, MOV, WebM, TS, AVI, M4V) | Standard video files containing H.264, H.265/HEVC, VP9, AV1, or MPEG-4 video and standard audio codecs. |
| Output | Repacked Video Container (MP4, MKV, MOV, TS) | Compatible selected streams copied without re-encoding into a new container; metadata and track selection may differ. |
Common Practical Use Cases
- OBS Studio MKV to MP4: Repackage an MKV recording as MP4 when its codecs are supported and your editing workflow prefers MP4.
- Stream copy without re-encoding: Change a compatible container without adding a new lossy encoding generation; allow time for engine download and file processing.
- Web Streaming Compatibility: Repack video files into faststart MP4 or MPEG-TS containers suited for progressive web playback and media servers.
Important Limitations & Technical Boundaries
- Codec-container compatibility: the target must support the selected source streams. If stream copy fails, choose another container or re-encode with Video Converter.
- This changes packaging, not image pixels. Track selection, timestamps and metadata may change; check playback before deleting the source.
Frequently Asked Questions
What is video remuxing and how is it different from video conversion?
Remuxing changes the container wrapper by copying selected compressed streams without re-encoding. It avoids generational quality loss, but speed depends on file size, device performance and first-use engine download.When does video remuxing work?
The selected output container must support the codecs and streams in the source. A common compatible case is H.264 video with AAC audio copied from MKV to MP4; check the exported file in your target player.Is my video file uploaded to any cloud server during remuxing?
A file chosen from your device is processed in the browser. The FFmpeg engine downloads on first use; optional cloud import fetches the selected file from its provider. See the privacy policy for site analytics and ads.Why remux an MKV recording to MP4?
Some players and editing workflows prefer MP4. If the MKV contains compatible codecs, stream copy can change its wrapper without re-encoding the video or audio.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?
FFmpeg reports a failure. Try MKV or use Video Converter to re-encode. The tool does not silently change codecs.Does remuxing alter audio quality or subtitle tracks?
Selected streams are copied without re-encoding when supported. Container changes can affect track selection, metadata and playback support, so inspect the output before discarding the original.Is ToolJiffy Remux Video free to use without limits or watermarks?
It is free without an account or watermark. The file picker limits input to 500 MB, and browser memory can limit practical use.