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Edit and Cut

Trim Video

Drag the handles or type the times to keep only the part you want. Fast mode copies the streams so the cut takes seconds and the quality is untouched. Accurate mode re-encodes for a frame-exact start.

  • Nothing is uploaded
  • Free, no sign-up, no watermark
  • Works offline once loaded

Drop a video here

or choose a file

MP4, MOV, WEBM, MKV, AVI, M4V, 3GP, FLV, WMV and more

Processed on your device. Nothing is uploaded.

How to use Trim Video

  1. 1

    Add your video

    Drop a video on the drop zone or choose one from your device. It opens in the player straight away; nothing is uploaded.

  2. 2

    Mark the part to keep

    Drag the start and end handles on the timeline, or type exact times such as 1:05.5. Use the player to check each point.

  3. 3

    Pick a cut mode

    Fast copies the streams and finishes in seconds. Accurate re-encodes so the first frame lands exactly where you set it.

  4. 4

    Trim and download

    Press Trim video, follow the progress bar (Cancel stops it at any time), compare the before and after size, then Download.

Why use Aback Video for this

  • Lossless Fast mode

    Stream copy keeps the original video and audio bit for bit, so a 2 GB recording is cut in seconds without any quality loss.

  • Frame-exact Accurate mode

    When the cut has to start on a precise frame, Accurate re-encodes the kept section to H.264 and AAC.

  • Timeline and typed times

    Set the range by dragging or by typing seconds, mm:ss or hh:mm:ss.ms, whichever is quicker for you.

  • Stays on your device

    The video is read from your disk by FFmpeg running in the browser. No file is sent anywhere.

Frequently asked questions

Why does Fast mode start a little before my start time?

Compressed video can only restart cleanly at a keyframe, usually one every one to five seconds. Fast mode cuts at the keyframe just before your start time so the clip plays from its first frame. If you need the cut to land on an exact frame, switch to Accurate.

Does trimming reduce quality?

Not in Fast mode: the streams are copied, not re-encoded, so the kept part is identical to the original. Accurate mode re-encodes at a high quality setting, which is visually very close but not bit-identical.

Is my video uploaded?

No. Trimming runs on your device with FFmpeg compiled to WebAssembly. The page loads its code once, then works on the file locally, and it keeps working if you go offline.

How large a file can I trim?

Fast mode reads the file directly from disk, so recordings of several gigabytes usually work on a computer. Accurate mode holds more in memory; on a phone keep it to a few hundred megabytes, and trim with Fast first if the file is huge.

What format is the trimmed file?

Fast mode keeps the original container where it can, so an MP4 stays an MP4 and a MOV stays a MOV. Accurate mode always produces an H.264 and AAC MP4 that plays everywhere.

Can I trim a video on my phone?

Yes. The tool works in Safari on iPhone and Chrome on Android. Fast mode is the better choice on a phone because it needs little memory and finishes quickly.

Can I keep two separate parts of a video?

Trim keeps one continuous range. To remove something from the middle and keep both sides, use Remove a Section. To cut a video into several pieces, use Split Video.

Related tools

Remove a Section

Delete a part from the middle of a video and join the rest.

Split Video

Split a video into equal parts or fixed-length clips, downloaded as a ZIP.

Compress Video

Shrink a video's file size with simple quality presets.

Video to GIF

Make a sharp animated GIF from any part of a video.

Merge Videos

Join several clips into one video, in the order you choose.

Change Video Speed

Speed up or slow down a video from 0.25x to 4x, keeping the voice natural.

Reverse Video

Play a video backwards, with the sound reversed or muted.

Loop Video

Repeat a clip 2 to 20 times in one file, without re-encoding.

Guides