Precise mode is frame-accurate (re-encodes the clip), Fast mode cuts on the nearest keyframe (no re-encoding, almost instant) but may include up to ~1 second on either side.

Yes — both audio and video are kept and trimmed together. Audio is re-encoded to AAC in Precise mode and copied as-is in Fast mode.

An MP4 file with H.264 video and AAC audio — the most universally compatible video format for phones, players, and social platforms.

Cloud trimmers run on dedicated server CPUs but require uploading your file. This tool processes everything inside your browser using FFmpeg compiled to WebAssembly, so speed scales with your local hardware. Use Fast mode for an instant cut without re-encoding.

Up to 500MB. Larger files may run out of browser memory because WebAssembly cannot use more RAM than the browser allocates to a tab.

Completely. Your file never leaves your device — there is no upload, no account, no tracking, and no watermark. Closing the tab erases the file from memory.

Yes — process another clip after each download, or chain with the Video Splitter to slice a long video into many parts.

In stream-copy mode (the default), no — the selected range is extracted byte-for-byte at the codec level with no re-encoding, no quality loss, and no significant CPU usage. The trim finishes in seconds even on hour-long videos. In precision mode, only the very small portion at the cut points is re-encoded to make the cut frame-accurate; the bulk of the clip is still stream-copied.

In stream-copy mode the cut snaps to the nearest keyframe in the source video, which is usually within a fraction of a second of your marked point. This is a fundamental limitation of stream-copy: cutting at non-keyframe boundaries would produce a corrupted file because video codecs depend on keyframes to decode subsequent frames. If you need an exact-frame cut, switch to precision mode, which re-encodes the cut points to put them exactly where you want.

Not in a single operation — the trimmer extracts one continuous range. To remove a middle section, run the tool twice (extract before-cut and after-cut), then merge the two clips with Video Merger. That two-step approach is also less destructive: each individual trim stays lossless, and the only re-encode happens at the join.

The 200 MB upload limit applies. In practice, stream-copy trimming has very low memory overhead, so even a 200 MB hour-long video trims in seconds. Precision mode uses much more memory because it re-encodes the cut regions; for very long videos in precision mode, work in shorter batches.

Yes — stream-copy preserves the original audio/video timing exactly because both streams are cut at the same point. Precision mode also maintains sync; the re-encode at the cut points includes both video and audio. The only place sync issues arise is with very poorly-mastered source files where the original was already slightly out of sync; the trimmer cannot fix pre-existing timing problems.

Subtitle tracks are preserved when the destination container supports them and the subtitles fall within the trimmed range. Chapter markers in the trimmed range are kept; chapter markers outside the range are dropped. If your subtitles are burned into the video (rendered as pixels rather than a separate track), they are part of the video stream and survive automatically.

Currently each trim is one range per operation. To extract multiple non-contiguous clips, run the tool multiple times with different ranges — the source video stays loaded between runs so the second and third trims are nearly instant.

Trimming extracts one range and produces one output file. Splitting (a separate Split Video tool) divides a video into many parts at multiple cut points and produces many output files in one operation. Use trim when you want one clip; use split when you want to divide the source into chunks.