Fast trim uses the compatible local path
Fast trim lets the local engine use compatible conversion optimizations. This first writer does not promise keyframe-aligned or lossless trimming; the result is remeasured before it is offered for download.
Local video trimmer
Keep the right part of a video, without a crowded editor.
Set a start and end for one local clip. Fast trim uses the compatible local path when possible; Exact trim is for frame-oriented boundaries when local re-encoding is supported.
Your video stays on this device. No upload, account, or server-side processing job.
Browser-local workspace
Open the private video workspace when you are ready.
Choose one local MP4, M4V, MOV, or WebM file. JavaScript activates a browser-native preview and capability check; available conversions depend on the codecs supported by this device.
No upload, account, or server-side media job.
Open private workspace Loads only after you choose to open it.
Exact trim trades speed for the boundary
An exact boundary requires a local decode and re-encode of the kept section. The workspace makes that cost visible before starting, especially for high-resolution or long sources.
Private browser processing
Your video remains in your hands.
Aftermath reads selected video bytes only in the current browser. Unsupported codecs are reported clearly rather than sent to another service. High-resolution conversion can use substantial device battery and processing.
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