Video Splitter

Use this browser-based video splitter to extract one precise section from a longer video. Preview the source, choose a start and end time with the slider or millisecond time input, process the selection, and download the result as an MP4. It is useful for trimming an introduction or ending, isolating a presentation excerpt, creating a short social clip, saving a key moment, or removing unwanted footage around the part you want to keep.

Processing runs locally with FFmpeg.wasm. Your selected video is read into the browser and is not uploaded to MiniWebtool. This gives you a private workflow, while also making processing speed and maximum practical file size dependent on your device's available memory and CPU.

Common Uses

Supported Video Formats

The input picker accepts video files, and FFmpeg.wasm can decode many common containers. Actual compatibility depends on the codecs inside the file as well as the browser and device.

Key Features

• Local browser processing: FFmpeg.wasm handles the selected file on your device rather than uploading it to a server.
• Visual and manual time selection: Scrub with the slider or enter an exact HH:MM:SS,mmm value.
• Full-length default: If you do not set custom boundaries, the tool keeps the complete duration selected.
• Original and result previews: Check the source before processing and play the generated segment before saving it.
• Audio preservation: Compatible audio from the chosen time range is copied into the MP4 output.
• Progress feedback: Separate indicators show engine loading and video-processing progress.
• Repeatable clip creation: Change the boundaries and process the same source again to export another segment.

How to Split a Video Online

1. Wait for the processing engine: Let the FFmpeg splitting engine finish loading before selecting a file.
2. Select a video: Drag a video onto the upload area or choose Select Video, then wait for the original preview and duration to appear.
3. Set the start point: Move the slider or enter a time in HH:MM:SS,mmm format, then choose Set Start Point.
4. Set the end point: Move to a later time and choose Set End Point. If no custom points are set, the full video remains selected.
5. Split and preview: Choose Split Selected Segment and keep the page open while the browser processes the video. Review the generated segment in the preview player.
6. Download the segment: Choose Download Split Segment to save the MP4, or set new points and run the splitter again to create another clip.

Understanding the Time Format

Manual times use HH:MM:SS,mmm: hours, minutes, seconds and milliseconds. For example, 00:01:23,500 means 1 minute, 23 seconds and 500 milliseconds. The start must be earlier than the end and both points must fall within the source duration. Although you can enter milliseconds, a visible cut ultimately lands on an encoded video frame, so actual precision is limited by the frame rate and source timestamps.

Output Quality and Performance

The selected video is re-encoded to H.264 with a balanced quality setting and packaged as MP4. This improves output compatibility but is not lossless, so repeated processing can gradually reduce quality. Compatible audio is copied without re-encoding. Because WebAssembly processing uses local CPU and memory, long 4K videos and very large files may run slowly or exceed the resources available to a mobile device or browser tab.

Troubleshooting

• The engine does not load: Refresh the page, confirm JavaScript is enabled, and check whether a network filter is blocking the FFmpeg script.
• The file will not open: The container may use an unsupported codec. Converting the source to a standard H.264/AAC MP4 often resolves this.
• Processing stops or the tab closes: Try a shorter or lower-resolution source, close memory-heavy tabs, or switch to a desktop browser.
• The output has no audio: The source may be silent or its audio codec may be incompatible with MP4 stream copying.

Frequently Asked Questions

Is my video uploaded to a server?

No. The tool uses FFmpeg.wasm to read and process the video locally in your browser. The file is not sent to MiniWebtool, although your browser still needs an internet connection to load the page and processing engine.

Which video formats can I split?

Common inputs such as MP4, WebM, MOV, M4V, AVI and MKV can work when their codecs are supported by the browser-based FFmpeg build. The downloaded segment is an MP4. Format support can vary by codec, browser and device, so converting an unusual source to MP4 first may help.

Does splitting reduce video quality?

The selected video segment is re-encoded as H.264 using a balanced quality setting, so it is not a lossless stream copy. The result should look close to the source for normal use, but repeated re-encoding can gradually reduce quality.

Will the split video keep its audio?

Yes, the tool keeps the audio that falls inside the selected time range when the source audio codec is compatible with the MP4 output. A silent source remains silent, and an unusual or unsupported audio stream may require converting the source first.

Why can a large video take a long time or fail?

Browser-based processing loads video data into memory and uses your device's CPU. Long, high-resolution or very large files therefore need more RAM and processing time. Close other memory-heavy tabs, try a shorter source, or use a desktop browser if the process stops.

Can I create several clips from one video?

The tool exports one selected segment at a time. After downloading a clip, set a different start and end point and run the splitter again. The original video remains available on the page until you select another file or reload.

How precise are the start and end times?

You can enter times to the millisecond in HH:MM:SS,mmm format, but practical cut accuracy is limited by the video's frame rate, timestamps and codec. For frame-based media, the nearest encoded frame determines the visible boundary.