How to Trim a Video Without Losing Quality (Free, in Your Browser)

To trim a video without losing quality, cut it without re-encoding. That means copying the original video and audio data into a shorter file instead of compressing the picture again. The free Edesy Video Trimmer does this in Fast mode, in your browser, with no upload and no watermark. If you need the cut on an exact frame, Precise mode re-encodes the clip instead, which looks very close to the original but is not identical.

Trim now: Video Trimmer. MP4, MOV, M4V, WebM and MKV.

Fast vs Precise at a glance

Why stream copy keeps the quality

Video files are already compressed. Every time you re-encode, the encoder throws away a little more detail to hit its target size, and the losses add up over repeated edits. Stream copy skips that step: the tool reads the compressed frames you want to keep and writes them into a new file unchanged. No frames are decoded and compressed again, so there is nothing to lose.

The trade-off is keyframes. Most frames in a compressed video only store the changes from the frames around them. A keyframe is a complete picture, and a copied clip has to start on one, because the frames after it depend on it. Phones and cameras usually place a keyframe every few seconds.

A worked example: how early will Fast mode start?

Say your video has a keyframe every 2 seconds, at 0:44, 0:46, 0:48 and so on, and you set the start at 0:47.3.

Keyframe before 0:47.3  = 0:46.0
Extra footage at start  = 47.3 - 46.0 = 1.3 seconds
Worst case              = just under one keyframe gap, so just under 2 seconds

So a Fast trim starting at 0:47.3 begins at 0:46.0, 1.3 seconds early. For cutting a long pause off the start of a screen recording, that does not matter. For a clip that must start on the first word of a sentence, switch to Precise.

Step by step

1. Open the Video Trimmer and click Load Video Engine. This loads FFmpeg into the page once.
2. Add your video. Drop an MP4, MOV, WebM or MKV file onto the tool, or click to choose it.
3. Choose the start and end. Any of these works:
   • Type a time in seconds (75.5) or minutes:seconds (1:15.5). Longer videos also take hours (1:02:03).
   • Pause the preview where you want and click Set start at current time or Set end at current time.
   • Drag the two handles on the Selection slider. Click Play selection to watch just the part you will keep.
4. Pick the Trim mode: Fast or Precise.
5. Click Trim Video. Watch the trimmed clip in the preview, then click the Download button.

File size limits in a browser, honestly

Everything happens in your browser's memory. The whole video is loaded while it is cut, and the trimmed copy sits next to it until you download. There is no fixed size limit, but memory runs out sooner on a phone, and sooner still with many tabs open.

To see why, estimate the file size from bitrate and length. Say a phone video is recorded at about 16 megabits per second and runs 10 minutes:

File size  = 16 Mbit/s x 600 s / 8 = 1,200 MB
45 s clip  = 16 x 45 / 8           =    90 MB
In memory  = 1,200 + 90            = 1,290 MB, plus the engine itself

That can work on a computer with free memory and fail on a phone. The tool shows a warning for any file over 500 MB. If a large file fails:

• Close other tabs and try again on a computer.
• Use Fast mode, which needs less work than Precise.
• Shrink the file first with the Video Compressor, then trim (this does re-encode, so do it only when you need to).

Short clips and everyday phone videos are well within range.

Removing the sound too

To keep the picture and drop the audio, run the trimmed clip through Mute Video. It uses the same stream-copy approach: the video is copied unchanged and the audio tracks are left out, so quality is identical and the file gets a little smaller. Click Load Video Engine, add one or more videos, click Remove Audio, then Download or Download All (ZIP). If you might need the sound later, save it first with Video to MP3; our guide to converting a video link to MP3 covers the online route.

Common questions

Can I trim the middle out of a video? This tool keeps one continuous section between a start and an end. To remove a middle section, trim the two parts separately.

Can I mute the clip without re-encoding? Yes. Mute Video copies the picture as it is and only drops the audio.

Why did Precise mode change my MKV to MP4? Precise always saves an MP4, the most widely playable format. Fast keeps your original format.

Is there a watermark? No. The clip is just your video, cut to the times you chose.

Clips for a product or support line?

If you are cutting demo or training clips for a support team, the calls those customers make next can be handled too. Edesy builds AI voice agents that answer routine calls in Indian languages and hand the rest to your team.