How can I reduce video size for mp4 file on my pc?

Use a more efficient codec.

Modern codecs like H.265/HEVC compress video better than older codecs like H.264 while maintaining similar quality.

How to reduce video file size for mp4

Step 1: Open the video in HandBrake or another encoder that supports H.265.

Step 2: Choose H.265 as the output codec.

Step 3: Adjust quality settings if needed (lowering the CRF value gives better quality).

Step 4: Encode the video.

Switching to a more efficient codec can reduce file size by 30–50% without noticeable quality loss, making it perfect for storage and online sharing.

While modern codecs such as H.265 (HEVC) and AV1 can greatly reduce video file size, they also come with some drawbacks:

1. Longer Encoding Time

More efficient codecs require more processing power to compress video. Encoding a video in H.265 or AV1 can take significantly longer than using H.264, especially on older PCs.

2. Higher Hardware Requirements

Playback of H.265 and AV1 videos may require newer CPUs or GPUs. Older computers and mobile devices can experience stuttering, lag, or excessive battery consumption when playing these formats.

3. Compatibility Issues

Some older TVs, media players, video editors, and operating systems may not fully support newer codecs. A video encoded in H.265 or AV1 might fail to play on certain devices without installing additional codecs.