How to Convert a Video Online
Follow these three simple steps to convert a video to another format. No software installation required.
Select a Video
Choose one MP4, MOV, WebM, AVI, MKV, M4V, MPEG, MPG, FLV, WMV, 3GP, or OGV video from your device.
Choose Format and Settings
Select MP4, WebM, OGG, WMV, MKV, MOV, FLV, or AVI, then keep or change the resolution, frame rate, audio sample rate, and audio channels.
Convert and Download
Start the conversion, review the original and output file sizes, and download the converted video.
How Does the Video Converter Work?
The CompressFly video converter decodes your selected video and re-encodes it in the output format you choose. You can keep the original resolution and frame rate or select different settings, and adjust the audio sample rate and channels before conversion.
Conversion runs directly in your browser. Your video is not uploaded to a server, and the completed file downloads from the browser to your device.
What "directly in your browser" means
- Your video is not uploaded to a server.
- Video conversion runs locally on your device.
- The completed video downloads directly from your browser.
Which Video Format Should You Choose?
Choose an output format based on the player, website, device, or workflow that will use the converted video.
| Format | Best For | What to Know |
|---|---|---|
| MP4 | Phones, browsers, social platforms, and everyday sharing | Broadly supported H.264 video with AAC audio |
| WebM | Websites and browser-based applications | Uses VP8 video and Vorbis audio; check support in the destination app |
| OGG | Open-media and legacy web workflows | Uses Theora video and Vorbis audio and is less common in current devices |
| WMV | Windows-oriented legacy software and systems | Uses Windows Media video and audio codecs |
| MKV | Matroska-based players and media libraries | Uses H.264 video and AAC audio in an MKV container |
| MOV | QuickTime and Apple-oriented workflows | Uses H.264 video and AAC audio in a MOV container |
| FLV | Older systems that explicitly require Flash Video | Intended for legacy workflows rather than modern browser playback |
| AVI | Older software, equipment, or delivery requirements | Uses MPEG-4 video and MP3 audio in an AVI container |
The converter selects codecs that match the chosen output container. Renaming a file extension does not perform the same conversion.
Video Conversion Settings
Keep the source settings or adjust the output for the device, platform, or workflow that will use the converted video.
Output Resolution
Keep the original resolution or select 1080p, 720p, 480p, or 360p.
Frame Rate
Keep the source frame rate or choose 24, 25, 30, 50, or 60 frames per second.
Audio Settings
Keep automatic audio settings or select a sample rate and mono or stereo output.
Browse Video Conversion Tools
Open a dedicated converter when you already know the input and output formats you need.
Convert Video to MP4
Convert MP4 to Other Formats
Video Converter FAQ
How do I convert a video online?
Use this online video converter to change a video to another format in three steps: 1. Select one video from your device. 2. Choose the output format and adjust the available video or audio settings. 3. Start the conversion and download the completed video.
What input video formats are supported?
The general video converter accepts MP4, MOV, WebM, AVI, MKV, M4V, MPEG, MPG, FLV, WMV, 3GP, and OGV files.
What video formats can I convert to?
You can convert video to MP4, WebM, OGG, WMV, MKV, MOV, FLV, or AVI.
Can I change the video resolution and frame rate?
Yes. Keep the source resolution and frame rate or select an available output resolution and frame rate before conversion.
Can I change the audio settings?
Yes. Keep the automatic audio settings or choose a sample rate of 22.05, 44.1, or 48 kHz and mono or stereo output.
Will converting a video make the file smaller?
Not necessarily. The output size depends on the source video, selected format, resolution, frame rate, audio settings, duration, and visual content. Use the Video Compressor when reducing file size is the main goal.
Is the video converter free?
Yes. Use the video converter for free with no registration or credit card required.
Is there a file size limit, and is my video uploaded?
Your video is processed locally in your browser and is not uploaded to a server, so there is no server upload limit. The practical limit depends on your device's available memory and processing power, as well as the video's duration and resolution.