Client-Side PDF Toolkit
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About Video Trimmer
The Lossless Video Trimmer & Stream Cutter trims MP4, WebM, MOV, and MKV video clips to exact start/end timestamps using fast frame-accurate scrubbing, interactive video player scrubbing, and WebAssembly video muxing.
How to Use Video Trimmer
Step 1
Upload a video file (MP4, WebM, MOV, MKV).
Step 2
Drag the timeline handles or type exact start and end timestamps.
Step 3
Preview the trimmed segment in the player.
Step 4
Click "Export Trimmed Video".
Practical Use Cases for Video Trimmer
Clipping Highlights from Screen Recordings & Video Game Captures
Trim the exciting 15-second winning play from a 2-hour gameplay video capture without re-encoding delays.
Removing Intro/Outro Dead Air from Webinar & Meeting Recordings
Cut out the first 5 minutes of waiting room chat from Zoom and Google Meet recordings before sharing with colleagues.
Input & Output Examples
Trimming 20-Second Clip from 4K Video
Video: `gameplay.mp4` (1.2 GB), Start: `01:14.000`, End: `01:34.000`
Trimmed Video: `gameplay_trimmed.mp4` (45 MB) exported with 100% native video and audio fidelity
Key Features & Performance
- ✓Interactive video player with filmstrip thumbnail preview and draggable start/end handles.
- ✓Fast Lossless Stream Copy mode: cuts videos in seconds without re-compressing H.264/H.265/AV1 streams.
- ✓Millisecond precision timecode inputs (`hh:mm:ss.ms`).
- ✓100% Client-Side WebAssembly / HTML5 Video execution.
- ✓1-Click Download trimmed video.
Key Terminology & Definitions
Lossless Stream Copy (Demux/Mux)
Extracting video packets directly between keyframes without decoding and re-encoding video frames, completing in seconds with zero quality loss.
Keyframe / I-Frame
A complete standalone video frame containing all visual information, serving as the starting anchor for compressed inter-frame delta packets.