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Video Trimmer for Mac/Windows - Trim Videos without Reencoding

How to Trim MP4, MKV, AVI, MOV, WMV, FLV, VOB, MPG etc?


With a large video file in hand, and only want a precise part of it, but have no idea how to trim videos? Ever annoyed by the advertisement or the beginning and end segments of some TV program or series, and want to trim the video segment? If so, you need a powerful video trimmer which enables you to trim movies or music video in an easy way. The aim of this passage is to introduce the best Video Trimmer for Mac or Windows called iDealshare VideoGo.

Video Trimmer

iDealshare VideoGo is an user-friendly Video Trimmer, which supports trimming almost all kinds of videos as well as audios on Mac & Windows. What's more, iDealshare VideoGo can trim videos without reencoding (not change the original format), which will highly speed up the video trimming process, in the meanwhile, maintain the original video quality.

Key Features:

  • Acting as the Video Trimmer, iDealshare VideoGo can trim MP4, MKV, AVI, MOV, WMV, FLV, VOB, WebM, MPG, WTV, ASF, RMVB, AVCHD, MXF, DV, Apple ProRes, MPEG-1, MPEG-2 and etc
  • Acting as the Audio Trimmer, iDealshare VideoGo can trim MP3, WAV, FLAC, OGG, WMA, M4A, CAF, VOC, AIFF, APE, DTS, Opus, AU, RA, 3GA, AAC, AC3 and etc.
  • Extract audio from video and then trim a desired segment with only audio.
  • Trim video without reencoding; trim audio without reencoding
  • Trim video as well as convert to other video or audio format, trim audio as well as convert to other audio format.
  • Besides trimming video or audio files, this powerful Video Trimmer also has the other editing function like crop, merge, split, add or remove subtitles, edit or extract subtitles, watermark, effect, compress, decrease or increase video, audio volume, and etc.
  • Video Trimmer Mac version can trim MP4, MOV, etc video on Mac OS X Yosemite, Mavericks, Mountain Lion, Lion, Snow Leopard, Leopard, Tiger and etc.
  • Video Trimmer for Windows can trim AVI, MKV, WTV, VOB, etc on Windows 10, 8, 7, XP, Vista etc

Step by Step Guide to Trim MP4 Videos

Below is the step-by-step guidance to trim MP4 on Mac OS X, it also applies to trimming MKV, AVI, MOV, MP3 etc on Mac or Windows. Follow it and fast trim your videos.

Make Preparation: Free download the best MP4 Trimmer

Free download the professional MP4 Video Trimmer called iDealshare VideoGo - iDealshare VideoGo ( Windows Version, Mac Version), install and run it, the following interface will pop up.

MP4 Video Trimmer for Mac

Step 1 Import MP4 video files

Click the "Add File" button to import MP4 video files which you want to trim. Or simply drop your videos into this MP4 Trimmer Mac version.

Trim Video MP4 files on Mac OS X

Step 2 Set the beginning and end time

Click Trim button to open the Trim window, and follow the steps below to capture a MP4 clip from your movie.

MP4 Trimmer for Mac - Trim MP4 files

There are three methods to set trim time for the MP4 files:

  • Method 1: Enter the Start Time and the End Time in the time box.
  • Method 2: at the bottom of the preview window, there are scissors bars, drag them, the accurate time will appear in the time box.
  • Method 3: simply click the start and end point of the video.


  • Click "Reset All" to restore the settings to defaults.
  • Click "OK" to save the settings if you have completed video cropping.

Step 3 Set trim video without re-encoding

  • Click the "Profile" drop down button to select MP4 as output profile from the "General Video" category.
  • Then click "Setting..." button to open the "Advanced Settings" Window. Swith to the "Advanced" panel, double click H.264/MPEG-4 AVC on the right side of Video Codec to select Copy from the drop down list.

Step 4 Finish trimming MP4 files

Click the "Start" button in the bottom right part to finish video trimming without reencoding.