Camtasia (Windows): How to make the file size of videos smaller


My video file size is too big and I would like to make it smaller.


Video Encoding and File Size

There are several variables that affect file size. This article provides tips and general guidelines to help maximize your video and audio quality while minimizing the file size.  The items below all will affect the overall production size & quality.

Video Format

As a general rule of thumb, producing the video in MP4/h.264 format often delivers the best quality with smallest file size. MP4 is especially popular for web-based delivery. (AVI, MOV, or WMV can sometimes be good choices for CD or DVD delivery.) The default output from Camtasia Studio is MP4.

Video Dimensions (in pixels)

Larger videos (in resolution) will dramatically increase file size. You may want to limit your video to no larger than 1280 pixels (width) by 720 (height). Don't record your entire screen unless it's really necessary, or consider using zoom and pan actions. This way you can scale the video down, but still focus the viewer's attention on a specific portion of the screen. Another tip is to reduce your screen resolution before recording your screen activity.

Video dimensions are set when you add video to the Timeline with the Production Settings or Editing Editing Dimensions box in Camtasia.

Amount of Movement in the video

The more movement in the video, the larger the file size will be. For example, recording some fairly static presentation slides will yield a smaller file size than recording some on-screen live video. If possible, try not to drag windows around and limit some of the fancy animations in PowerPoint for example. Using the MP4 video format will also help mitigate some of the file size issues associated with movement, as MP4 is highly efficient in this regard.

Audio Type

It is very rare that uncompressed audio is going to make an audible difference to your viewers. Therefore, you can reduce the file size dramatically by compressing the audio upon production. Unless you're featuring an orchestral masterpiece in your screencast, record mono audio, and after you're done editing, produce your video with compressed audio. Our default MP4 format uses AAC audio compression which has a good combination of sound quality and file size. You can learn more about audio at the end of this article.

Frame Rate

The frame rate indicates how many frames per second are shown to the viewer. The custom production settings allow for between 1 and 30 frames per second (fps). The default is 30 fps and it is typically more than adequate for most Camtasia users. If you're recording something fairly static, like a PowerPoint presentation you can drop the fps down which will save you a bit of file size and go virtually unnoticed to your viewers. Frame rate is set in the Camtasia Recorder on Windows. You can also change the Frame Rate during the production process.

Recording Technology Used

On the Windows platform, there is a screen recorder called Fraps which is optimized for gaming. You may wish to use Fraps if you are recording a game, especially full screen, full motion, high framerate games.

Camtasia uses a new recording codec called TSC2 which works well for both screen activity and full-motion video.


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