How to Convert Video to MP4 Online

MP4 is the universal video format. It plays on virtually every device, browser, and platform. If you have a video in MKV, AVI, MOV, WebM, or any other format and need it in MP4, you can convert it online in minutes without installing any software.

Why Convert to MP4?

MP4 (MPEG-4 Part 14) has become the standard video format for good reason:

• Universal compatibility -- plays on Windows, Mac, Linux, iOS, Android, and every modern browser
• Efficient compression -- uses H.264 or H.265 codecs for excellent quality at small file sizes
• Streaming support -- optimized for web streaming on YouTube, Vimeo, and social media
• Metadata support -- stores subtitles, chapters, and multiple audio tracks

If you download a video from a camera, screen recorder, or another source and it will not play on your device, converting it to MP4 almost always fixes the problem.

Supported Video Formats

You can convert virtually any video format to MP4. Common formats include:

• MKV -- popular for high-quality video with multiple audio/subtitle tracks. Use the MKV to MP4 converter.
• AVI -- an older Microsoft format still common in legacy files. Try the AVI to MP4 tool.
• MOV -- Apple QuickTime format from iPhones and Macs. Convert with MOV to MP4.
• WebM -- Google's open format used on many websites. Use WebM to MP4.
• WMV, FLV, 3GP, and more -- all supported by the general Video Converter.

Step-by-Step Conversion

Converting a video to MP4 is straightforward with the Alleex Video Converter:

1. Open the Video Converter in your browser.
2. Upload your video file by dragging it onto the page or clicking to browse.
3. Select MP4 as the output format.
4. Choose your preferred quality settings (or keep the defaults for optimal results).
5. Click Convert and wait for the process to complete.
6. Download your new MP4 file.

The conversion runs directly in your browser using WebAssembly, so your video files are never uploaded to a server. This makes the process both fast and private.

Maintaining Video Quality

To get the best quality from your conversion, keep these tips in mind:

• Keep the original resolution. Do not downscale unless you need a smaller file. Converting a 1080p video to 1080p MP4 preserves quality.
• Use a reasonable bitrate. Higher bitrates mean better quality but larger files. For 1080p, 8-12 Mbps is a good balance.
• Avoid re-encoding when possible. If the source video already uses H.264 codec, some tools can remux without re-encoding, preserving perfect quality.
• Compress separately if needed. After converting, use the Video Compressor to reduce file size without losing visible quality.

Frequently Asked Questions