Video Trimmer
Cut a video down to an in/out range with a scrubbable preview, exporting the clip without a full re-encode where possible.
What is Video Trimmer?
A video cutter for extracting a section of a clip — a highlight, a specific answer in an interview, or a segment to share.
How it works
Preview and timings come from the browser's own decoder. The cut itself is done by the bundled ffmpeg engine: copy mode remuxes the existing streams (instant, keyframe-aligned), while re-encode mode rebuilds the selected range frame by frame for exact cut points.
- Load your file. Drag a file onto the drop zone or pick one from your device. It is read locally by the browser and never uploaded.
- Set the options. Adjust the handles, format, quality or threshold controls — the preview updates as you change them.
- Process and download. Run the tool, then download the result. Compare the reported before/after size for compressors and converters.
Examples
A 42 MB podcast episode → 9 MB MP3
Trim the intro, normalise to −16 LUFS, and export at 96 kbps mono — a typical interview lands around a fifth of the original size.
A phone video with the wrong orientation
Rotate 90° and the width/height swap in the output, so it plays upright in every player instead of relying on metadata flags.
Common mistakes
Expecting instant encoders
Video encoding runs in single-threaded WebAssembly, so a clip takes roughly its own length (or a little longer) to re-encode. Stream-copy operations are near-instant by comparison.
Re-encoding when a copy would do
Trimming, removing audio and joining same-codec clips can copy streams without re-encoding — pick the copy option when it is offered to avoid any quality loss.
Ignoring the first-load download
The media engine is about 31 MB and is fetched on first use, then cached. The first conversion on a connection is slower than every later one.
Frequently asked questions
Why does a copy-mode clip start earlier than the time I set?
Stream copy can only start at a keyframe. Choose re-encode when the exact frame matters, at the cost of encoding time.
Do I lose quality?
Not in copy mode — the original frames are untouched. Re-encoding at quality 74 keeps visually identical results for most footage while producing a smaller file.
How long does trimming take?
Copy mode finishes in seconds because only the container is rewritten. Re-encoding runs at roughly the clip's own length in the browser.