# Video trimmer

> Save a selected segment of a video.

[Open tool](https://www.toolcabana.com/cs/trim-video) · [Zvuk, video a soubory](https://www.toolcabana.com/cs/category/audio-video-and-files)

Tool ID: trim-video. Requested language: cs. Description language: en. Complete guide translation: no; untranslated sections use English.

## Overview (en)

The video trimmer saves one segment of a video as a new MP4 file. You enter a start time in seconds and a duration up to 3600 seconds, and the tool re-encodes that range to H.264 video with AAC audio. It first reads the file's length and stops with a clear message if the start time falls after the end.

## Supported tasks (en)

Save a selected segment of a video.

## Steps (en)

1. Choose a source file. If the tool accepts multiple files, arrange them in the order you want.
2. Set start time (seconds), duration (seconds).
3. Run video trimmer, review the output, then use the available copy or download controls.

## Settings

- Start time (seconds) (en; key: start; type: number); minimum: 0; maximum: 36000
- Duration (seconds) (en; key: duration; type: number); minimum: 0.1; maximum: 3600

## Limitations (en)

Media input is bounded to 50 MB per file and 100 MB combined. WebAssembly conversions have a 180-second limit and may require substantial browser memory.

## Example input

```text
A handy tool for every little task.
```

## Privacy and connections (en)

This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.

## Questions (en)

### Does the video trimmer cut without re-encoding?

No. The selected range is re-encoded to H.264 video and AAC audio using a fast preset, which allows cuts at any time rather than only at keyframes. This takes longer than a stream copy and can slightly change quality.

### How do I trim the first few seconds off a video?

Set the start time to the point where you want the clip to begin, for example 5, and set a duration long enough to reach the end you need. The default duration is 10 seconds.

### Why does the trimmer say the selected range contains no media?

That message appears when the output is empty, usually because the start time leaves nothing to save. Choose an earlier start. If the duration of the file cannot be read at all, the tool asks for a file with a valid duration.

### Where is my input processed?

This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.

### What are the input limits?

Media input is bounded to 50 MB per file and 100 MB combined. WebAssembly conversions have a 180-second limit and may require substantial browser memory.

## Related tools

- [Video compressor](https://www.toolcabana.com/cs/compress-video)
- [Audio trimmer](https://www.toolcabana.com/cs/trim-audio)
- [Video to GIF](https://www.toolcabana.com/cs/video-to-gif)
- [GIF maker](https://www.toolcabana.com/cs/gif-maker)