Which Cut Method Should I Use?

Use Accurate Re-encode when the visible boundary matters and Fast Keyframe Cut when speed and avoiding another encode matter more. Fast cuts commonly move to a nearby source keyframe.

Does It Preserve Every Track?

No. The focused output carries the primary video and optional audio. Subtitle, attachment and data tracks are intentionally excluded.

Does The Source Leave The Device?

No. FFmpeg WebAssembly runs in the browser after its runtime files download; the selected media remains local.

Video Trimmer

Set video in and out points, compare accurate re-encoding with fast keyframe cuts, retain or remove audio, and export locally.

Local processing: your media stays on this device.First export downloads about 31 MB of FFmpeg WebAssembly

01 · Source

Source Video

Mark a precise working range, preview it, then choose a fast or re-encoded cut.

Drop a video hereor choose a local file · maximum 250 MB / 30 minutes

02 · Settings

Output Controls

Settings are validated before the runtime starts.

Cut Method

Start TimesecEnd Timesec

IN 00:00:00.00OUT 00:00:00.00

Output ContainerQuality (CRF 24)

Remove Container MetadataInclude Primary Audio

03 · Output

Output Workspace

The completed file and processing receipt will appear here.

Open a source, confirm the settings, then run Export Clip.

Codec note: exports run in FFmpeg WebAssembly after a first-use download of about 31 MB. The 250 MB / 30 minutes picker ceiling is not a success guarantee: the complete source and output occupy browser memory, available decoders vary, and large 4K or unusual-codec media may still fail. Processing uses a duration-aware 5–45 minute job timeout. Fast trimming follows source keyframes and is not frame-perfect; re-encoded timing can still vary slightly on variable-frame-rate media.

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What Is the Video Trimmer?

The Video Trimmer is a local clip-finishing desk with player-synchronized in and out controls, numeric and range inputs, an accurate re-encode path for MP4 or WebM, a fast stream-copy path, optional audio, metadata removal, output planning and a reproducible JSON receipt.

How It Works

Open a browser-readable source, use the player and Set In or Set Out controls to mark the range, then choose Accurate Re-encode or Fast Keyframe Cut. Review the duration and method warning before exporting. The first processing run downloads about 31 MB of FFmpeg WebAssembly.

When to Use It

Use it for selects, excerpts, review clips and rough editorial handoffs. Fast stream copies can begin on a nearby keyframe, while re-encoded cuts seek more accurately but can still shift slightly with variable-frame-rate material; neither mode claims guaranteed frame-perfect finishing.

Frequently Asked Questions

Which Cut Method Should I Use?: Use Accurate Re-encode when the visible boundary matters and Fast Keyframe Cut when speed and avoiding another encode matter more. Fast cuts commonly move to a nearby source keyframe.
Does It Preserve Every Track?: No. The focused output carries the primary video and optional audio. Subtitle, attachment and data tracks are intentionally excluded.
Does The Source Leave The Device?: No. FFmpeg WebAssembly runs in the browser after its runtime files download; the selected media remains local.

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