All-in-One Video Merger Tool

A free Windows batch video merging tool that supports lossless joining of multiple formats such as MP4 and MKV, with features for unifying resolution, intelligently adding black bars, and format conversion.

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Tool Usage

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A desktop version is available with more powerful, stable features. Open desktop version

Instructions

Software Usage Instructions

Import video files: Click the "Import Video" button or drag video files directly into the list. Mainstream formats such as MP4, MKV, MOV, and AVI are supported, and you can select files in batches. The list supports drag-and-drop to adjust the merge order.
Set the save location: In the "Save Directory" field, click the "Browse" button and select where to store the merged video.
Configure output parameters:
- Output format: Common container formats such as MP4, MKV, MOV, and TS are supported.
- Encoding selection: Supports H.264(libx264), H.265(libx265), and Copy mode (lossless and ultra-fast).
- Quality control: Customize the video bitrate, frame rate, and audio sample rate.
Unify resolution (optional): Check "Unify Resolution" and enter the target width and height (such as 1920x1080). The software will automatically scale the videos and intelligently add black bars to ensure the image is not distorted.
Start merging: Click the "Start" button, and the software will process the files in order. The log area at the bottom displays progress in real time, and a prompt will appear automatically when processing is complete.

FAQ

A: Copy mode means the original video streams are directly copied and joined without re-encoding. This mode is extremely fast and lossless, but it requires all videos to be merged to have exactly the same resolution and encoding format; otherwise, it may fail.

A: Yes. It is recommended to enable the "Unify Resolution" feature and set a standard size (such as 1920x1080). The software will automatically adjust videos of different sizes to that resolution and fill any missing areas with black bars, ensuring the merged video plays correctly.

A: Input supports almost all mainstream video formats, including MP4, MKV, MOV, AVI, FLV, WMV, MPG, TS, 3GP, and WEBM. Output supports MP4, MKV, MOV, and TS formats.

A: The software runs entirely locally and does not need to upload any files to a server. All video processing is completed on your computer, fully protecting your privacy and data security.

A: If you choose H.264 or H.265 encoding, or enable "Unified Resolution," the software needs to recalculate and render every frame, which consumes more CPU resources and time. If the video parameters are consistent, we recommend using Copy mode for the fastest speed.