Compress your file here

Or drop files here

Max. file size 50MB (want more?)

You're in good company:

Zamzar has converted over 510 million files since 2006

Why compress MP4 files?

MP4 files also go by the name of MPEG4 and are synonymous with Apple, specifically iTunes. They're a multimedia format and is the standard file format for Apple iTunes and tend to be the Internet standard for video files when a download occurs which means they are therefore widely used. Whilst MP4 files tend to be slightly smaller than other multimedia file formats they still have scope to be compressed further using the Zamzar compression tool. The compression that is built into the MP4 file is split between audio and video with both being compressed differently - the video element is compressed using MPEG-4 whilst the audio part uses AAC compression. MP4 files can range in size but because they're supported by so many applications they tend to be a file type that is heavily shared. Given email sending limits and limited storage on phones it is perhaps unsurprising that so many people wish to compress MP4 files further so they use up less storage. Zamzar MP4 compression allows you to reduce the size of your MP4 file whilst ensuring there's no noticeable impact to the quality.

Help is on Hand

We have a dedicated FAQ page in case you ever need any help, and if the answer isn't on that page, then drop our support team an email and they'll be happy to help.


The addition of real-time conversions to the site means that you get your files converted that much more quickly.

High Quality

Zamzar has been in existence now for over ten years, and so we’ve been able to improve and refine our file conversions to ensure they're of the highest standard.

Any Operating System

Zamzar works for those who are running Windows, Linux or are on an OS for Mac.