Video Tools · Browser-based utility
Trim Video Online Free
Cut a selected time range from a video, set start/end times manually or from the current playhead, choose MP4/WebM output and advanced codec/CRF settings.
What this tool does
Cut a selected time range from a video, set start/end times manually or from the current playhead, choose MP4/WebM output and advanced codec/CRF settings.
People often describe this task with phrases such as trim video online, cut video, video cutter and clip video online. This page uses those terms only where they refer to the same underlying function.
How to use the Trim Video
- Open the Trim Video page and select or enter the source data required by the tool.
- Review the available controls instead of accepting defaults blindly when the destination has a size, format, layout or compatibility requirement.
- Run the operation and inspect the preview, status or generated result before treating it as final.
- Download or copy MP4, WebM and verify it in the destination application, browser, viewer or workflow that will actually use it.
Use the interactive tool above for the actual operation. The documentation below explains what the controls mean, what changes in the file/data, and how to troubleshoot common results.
Settings and capabilities explained
| # | Control or capability |
|---|---|
| 1 | Start time in seconds |
| 2 | End time in seconds |
| 3 | Set start/end from current playback position |
| 4 | Output: MP4 or WebM |
| 5 | Advanced codec: H.264 or VP9 |
| 6 | CRF quality value |
Supported input and output
- Input: browser-selected video
- Output: MP4 or WebM
How it works technically
Digital video combines time-based video frames and usually audio streams inside a container. Codec, resolution, frame rate, quality controls and audio settings jointly determine compatibility, processing cost and output size.
Trimming with this implementation runs through FFmpeg.wasm in the browser and encodes the selected range rather than merely changing a playlist reference.
CRF is a quality-target mode: lower CRF generally means higher quality and larger output for the same encoder/content.
Start/end timestamps define temporal boundaries; seeking accuracy can depend on decoding and keyframes, especially across codecs.
Common use cases
- Cut silence from the beginning
- Save one scene from a long recording
- Create a short clip for messaging
- Remove unwanted ending footage
Choosing the right settings
- Set boundaries from the video playhead for quick visual selection.
- Keep CRF near the default until you have a reason to trade quality for size.
Common problems and fixes
The cut starts slightly differently than expected
Video seeking and re-encoding can interact with frame timing; use precise fractional seconds and inspect the result.
Processing is slow
The FFmpeg engine runs in the browser and video encoding is CPU intensive, especially for long/high-resolution clips.
Browser processing and privacy notes
The source code for this build performs the documented file transformation or analysis from browser JavaScript/Web APIs, and the video tools load FFmpeg.wasm for media processing. The site also contains third-party analytics, font/CDN and advertising scripts that can make ordinary network requests. Therefore, the precise claim made here is limited to the tool routine: it does not need a separate AutoClip file-upload API in order to perform the documented local operation.
For sensitive files, you should still use your browser’s developer tools or network controls if you need to independently verify the behavior of every third-party request in your environment.
Frequently asked questions
What does the Trim Video do?
Cut a selected time range from a video, set start/end times manually or from the current playhead, choose MP4/WebM output and advanced codec/CRF settings.
What input and output does it use?
Input: browser-selected video Output: MP4 or WebM Outputs include MP4, WebM.
Do I need to install desktop software?
No desktop installation is required for this page. The interactive workflow runs from the web browser. Some advanced media features load browser-side JavaScript/WebAssembly libraries when needed.
Why can processing take time?
Video decoding and encoding are computationally expensive. The current video tools use FFmpeg.wasm in the browser, so speed depends on source duration, resolution, codec, settings and device CPU/memory.
The cut starts slightly differently than expected?
Video seeking and re-encoding can interact with frame timing; use precise fractional seconds and inspect the result.
Processing is slow?
The FFmpeg engine runs in the browser and video encoding is CPU intensive, especially for long/high-resolution clips.