Video files come in a bewildering number of formats. MP4 plays everywhere, but your camera shoots MOV. Your editor exports MKV, but your phone won't play it. This guide covers everything you need to know about converting video files online - without installing software.
Why Do Video Formats Matter?
Each video format is a container: it holds the video stream, audio track, subtitles, and metadata. The container format (.mp4, .mkv, .avi) determines compatibility, while the codec inside (H.264, H.265, VP9) determines quality and file size.
Common reasons to convert:
- Compatibility: Share with someone on a different device or platform.
- File size: H.265 (HEVC) can halve the size of an H.264 video at the same quality.
- Editing: Some editors prefer specific input formats.
- Uploading: Social platforms have codec/container requirements.
The Most Common Video Formats
| Format | Best For |
|---|---|
| MP4 (H.264) | Universal playback - works on everything |
| MOV | Apple ecosystem, high-quality recording |
| AVI | Older Windows apps, large uncompressed files |
| MKV | High-quality storage, multiple audio tracks |
| WebM | Web streaming, open-source friendly |
| GIF / WebP | Short animated clips for web |
How to Convert Video Files with RunConvert
RunConvert's video converter converts video files in the cloud - no installation, no waiting.
- Upload your file: Drag and drop or click to upload. RunConvert accepts MP4, MOV, AVI, MKV, WebM, FLV, WMV, and more.
- Choose your output format: Pick MP4, WebM, GIF, or any other supported format from the dropdown.
- Adjust settings (optional): Choose resolution, bitrate, or frame rate if you need precise control.
- Convert and download: Click Convert. Your file is ready in seconds, then automatically deleted from our servers.
Tips for Best Results
- MP4 (H.264) is your safest choice for universal compatibility.
- WebM is ideal for web embedding - smaller files, good quality.
- MKV is best for archiving because it supports multiple audio and subtitle tracks.
- For large files, conversion may take a minute - the upload is usually the slowest part.
Frequently Asked Questions
Can I convert a MOV from my iPhone to MP4?
Yes - use the MOV to MP4 converter. Upload the .mov file, choose MP4 as the output, and RunConvert handles the rest.
Will quality be lost?
Re-encoding always involves some quality trade-off, but RunConvert uses high-quality settings by default. Converting to a lossless format (like MKV with the same codec) minimizes losses.
Is there a file size limit?
RunConvert supports larger files than most free tools. If your file is very large, try compressing it first or converting in segments.
Conclusion
Video conversion doesn't have to be a headache. RunConvert handles the heavy lifting in the cloud - just upload, pick your format, and download. Whether you're going from MOV to MP4, AVI to WebM, or anything in between, the process takes under a minute.