Extract any portion of a video by setting an exact start time and duration. Remove unwanted intros, cut highlights, extract scenes, or create short clips — all online with no software required.
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MP4, MKV, AVI, MOV, WebM, WMV • Up to 500 MB
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Convert your files in three simple steps — no software, no signup.
Upload any video in MP4, MKV, AVI, MOV, WebM, WMV, or FLV format. Maximum file size is 500 MB.
Enter the start time (e.g. 0:30 to begin 30 seconds in) and the clip duration (e.g. 1:30 for a 90-second clip). Use HH:MM:SS format for precision.
Download your trimmed video clip in the same format as the original. Stream copy mode ensures near-instant processing with no quality loss.
For most formats, the video and audio data are trimmed without re-encoding (stream copy), resulting in near-instant cutting with zero quality loss.
Extract the best moments from long recordings — sports highlights, wedding speeches, concert performances, or key conference moments.
Cut short clips under 60 seconds for Instagram Reels, TikTok, YouTube Shorts, or Twitter/X from any longer video source.
Strip unwanted intro sequences, title cards, and end credits from downloaded videos, lecture recordings, or webinar exports.
Extract specific chapters or techniques from long instructional videos for sharing with students or colleagues as standalone clips.
Uploaded files are processed in an isolated environment and deleted automatically within one hour.
All the formats you need, all in one place.
| Format | Description | Extension | Best Used For |
|---|---|---|---|
| MP4 TRIM | Cut MP4 clips with stream copy speed | .mp4 |
Social media clips, highlights, YouTube Shorts |
| MKV TRIM | Extract MKV segments without re-encoding | .mkv |
Home theatre recordings, Plex content clips |
| AVI TRIM | Cut legacy AVI video files | .avi |
Old camcorder footage, DVD rip excerpts |
| MOV TRIM | Trim Apple QuickTime MOV files | .mov |
iPhone recording clips, Final Cut Pro prep |
| WEBM TRIM | Cut WebM web video clips | .webm |
Web video excerpts, web player clips |
| WMV TRIM | Trim Windows Media Video files | .wmv |
Legacy corporate video excerpts |
| FLV TRIM | Cut legacy Flash video files | .flv |
Old web video archive excerpts |
From everyday users to professionals — see how people rely on this tool every day.
Cut a 15–60 second highlight from any longer video. Instagram Reels requires clips under 90 seconds — extract exactly the right moment.
YouTube Shorts must be under 60 seconds. Cut the best moment from a longer video for a standalone Short without a full editing suite.
Strip unwanted title cards, countdown timers, and branded outros from downloaded webinars, conference talks, and tutorials.
Clip individual chapters from long lecture recordings to create focused, distributable segments for students and course modules.
Quickly extract rough scene segments from long camera takes before importing into your NLE — reduces timeline clutter and import time.
Extract 30–60 second testimonial sound-bites from longer customer interviews for use in ads, landing pages, and social proof sections.
See how we compare to desktop software and other online converters.
| Feature |
Our Tool TransmuteBox |
VLC (manual) | Other Online |
|---|---|---|---|
| Stream copy (near-instant) | |||
| HH:MM:SS time input | |||
| Re-encode for frame accuracy | |||
| Preserves original codec | Varies | ||
| No watermark on output | Sometimes | ||
| No install required | |||
| Files auto-deleted after 2 h | Varies |
Built on industry-standard open-source tools for maximum quality and reliability.
Cutting a video seems simple — but the technology behind it involves important concepts like keyframes, stream copy, and encoding modes that directly affect speed, quality, and precision. Understanding these helps you choose the right approach for every trimming task.
Stream copy mode (-codec copy in FFmpeg) transfers compressed video and audio data directly to the new file without any decoding or re-encoding. This means:
The only limitation: cuts snap to the nearest keyframe, so you may get a cut 0.5–2 seconds from your exact target.
Compressed video (H.264, H.265) stores most frames as differences from previous frames. Only keyframes (I-frames) contain complete frame data. A cut with stream copy must start at a keyframe — otherwise the output video would start with corrupted frames that reference missing prior data.
Most videos have keyframes every 2–5 seconds. This means stream-copy cuts are accurate to within that interval. For most social media and casual use cases, this is perfectly acceptable.
If you need cuts at an exact frame (e.g., for a sports highlight that needs to start at the precise moment of a goal), re-encode mode decodes the video to the exact frame position and then re-encodes from that point forward. This is slower (takes time proportional to clip length) but produces a cut at any arbitrary frame.
Re-encode mode uses CRF 23 H.264 by default, producing a very small quality reduction compared to stream copy.
The video cutter accepts time in HH:MM:SS format:
Duration works the same way: a duration of 0:45 means the clip will be 45 seconds long from the start point.
If you need several non-contiguous segments from one video — for example, a highlights reel from a longer recording — use the Video Cutter to extract each segment individually, then use our Video Merger to combine them into a final compilation. This two-step workflow gives you precision control over each cut without needing a full video editor.