Repair your MP4 Online

Do you have a MP4 video or movie file that will not open correctly? If so, our free-to-use MP4 video repair tool may be able to help. Our tool analyses the content of your MP4 file and is able to determine if the file content is valid. Our tool will let you know what is wrong with your MP4 file and attempt to fix it.

Or drag and drop your files here to upload.
A maximum of 20 files can be uploaded at once.

Please note: Your MP4, once uploaded to our server, will be deleted 15 minutes after upload.
If our tool offers the option to repair your file, please ensure you download the repaired file within this time period.

How to Repair your MP4 Online?

Here are 3 simple steps to repair your MP4 using our fast and free repair tool.

Upload your MP4

Click the "Select File" button, then select a MP4 file. The maximum file size is 100MB.

Analysis and Repair

Your MP4 file will be analysed, and our tool will attempt to repair your MP4 file if possible.

Repair or Convert your MP4

Select an option to either repair or convert to receive your repaired MP4 file.

MP4 file format information

Full NameMPEG-4
Mime Typevideo/mp4

An MP4 file, short for MPEG-4 Part 14, is a widely used digital multimedia container format. It was developed by the Moving Picture Experts Group (MPEG) and is designed to store various types of multimedia content, such as video, audio, subtitles, and images, all within a single file. MP4 files are known for their efficient compression, which allows for high-quality media representation while keeping file sizes relatively small. This makes them ideal for streaming and sharing media over the internet or other digital platforms.

MP4 files are compatible with a wide range of devices and media players, including computers, smartphones, tablets, and smart TVs. The format's versatility and widespread support have contributed to its popularity in both personal and professional contexts. Many online platforms, such as YouTube and social media networks, utilize MP4 as their default video format due to its efficient streaming capabilities and broad compatibility.

Due to its flexibility, MP4 has become the standard format for storing video content in various applications, from capturing home videos on smartphones to distributing high-definition movies. Additionally, its ability to include multiple data streams, like audio tracks, subtitles, and chapter information, makes it a valuable choice for content creators and multimedia enthusiasts seeking a unified solution to store and share their creations.

Repairing a MP4 File

MP4 Video File Header Data

MP4 files are all binary format in nature, storing video frames in a compressed format dictated by a bit-rate setting. This bit-rate setting is often located within the file header bytes, a sequence of bytes unique to a particular file format. The header bytes not only identify the type of video file to be played but also compression and codec settings.

By analysing the MP4 file header bytes, our tool is able to calculate the expected length of the video file and also perform other integrity checks to ensure the video file is what the header bytes claim it to be. Our MP4 repair tool can check the header byte sequence relatively quickly and report any immediate issues right away.

Bit Rate and Quality

As mentioned above, within the MP4 file data are values that determine how aggressive the compression algorithm is when it comes to balancing file size with playback quality. Our tool will not alter any bit rate or other quality settings; these will be preserved during any repair performed on the uploaded file.

Video Codecs

Our tools support most common codecs, allowing our tool to parse the MP4 file content when looking for issues with the playback of the file.

Frequently Asked Questions

Will the resolution and quality of the MP4 file be affected?

No. Our MP4 repair tool will not adjust the resolution or quality of the repaired file.

Is it free to use the MP4 file repair tool?

Yes! Our MP4 repair tool is 100% free to use.

Are there any usage limits when repairing my MP4 file?

No, you can repair as many files as you wish. We do not have any limits when using our MP4 repair tool.

How long does it take to repair my MP4?

We aim to process MP4 repairs as quickly as possible; this usually takes around 5 seconds; however, this may be longer depending on the file size and data needed to be repaired.

What does the MP4 repair process involve?

Once your MP4 has been selected, it will undergo some initial checks to verify that the file has some basic information. If the initial checks pass, we then upload the file to our servers for more detailed analysis.

Is it safe to repair my MP4 on

Yes, of course it is! Your MP4, once repaired, is deleted 15 minutes after upload, and any download link will expire after this time.

Can I repair my MP4 on Windows, Linux, Android, iOS or Mac OS?

Yes! Our MP4 repair tool will run on any system with a modern web browser.