Convert Video Online Free — No Upload

How to Convert Videos

Upload your video

Drag and drop a video file or click to select it. Supports MP4, WebM, MOV, AVI, and MKV formats.

Choose output format

Select the target format: MP4 for universal compatibility, WebM for web use, or other supported formats.

Download the converted video

Click convert and download the result. The video is re-encoded to the selected format.

Why use FyleTools to convert videos?

100% Private

Your video never leaves your device. All conversion happens in your browser — no server uploads.

Free & Unlimited

No registration, no file limits, no watermarks. Convert as many videos as you need, completely free.

Multiple Formats

Convert between MP4, WebM, and other popular video formats. Choose the best format for your needs.

Frequently Asked Questions

Is my video uploaded to a server?

No. All conversion happens in your browser. Your video files never leave your device.

Which format should I choose?

MP4 (H.264) is the most universally compatible. WebM (VP9) offers better compression for web use. Choose based on your target platform.

Does conversion lose quality?

Some quality loss may occur when re-encoding. The tool uses high-quality encoding settings. To reduce file size further, use Video Compress after converting.

How fast is the conversion?

Speed depends on your device's hardware and the video length. Hardware acceleration is used when available for faster processing.

Can I convert multiple videos at once?

Currently the tool converts one video at a time. Upload each video individually and select the desired output format.

Does this work on my phone?

Yes. The tool runs entirely in your browser on any device. Conversion speed depends on your device's processing power.

Will subtitles be preserved?

Embedded subtitles may not be preserved during format conversion. External subtitle files (.srt) are not affected.

Is the audio preserved during conversion?

Yes. Both video and audio tracks are converted together. The audio is re-encoded to a compatible format for the output container.

Can I convert MKV to MP4 without quality loss?

If the MKV contains H.264 video, the tool can remux it to MP4 without re-encoding, preserving quality perfectly. Otherwise, high-quality re-encoding is used.

What codecs are used for the output?

MP4 uses H.264 video with AAC audio. WebM uses VP9 video with Opus audio. These are the standard codecs for each container.

Can I convert a 4K video?

Yes. 4K videos can be converted, though processing time scales with resolution and length. Modern devices handle most 4K conversions well.

Will the file size change after conversion?

File size depends on the target format and codec. Converting to WebM VP9 often produces smaller files than MP4 H.264 at equivalent quality.

When to Use This Tool

Convert a MOV file from an iPhone to MP4 for universal playback — then compress the video to reduce the file size for easy sharing.

Convert MP4 videos to WebM for optimal HTML5 video embedding on a website.

Convert an AVI or MKV archive video to MP4 for playback on modern devices and media players.

Convert a video to the required format for a specific platform or editing software.

Supported Formats

Format	Description	Best For
MP4	H.264 universal video	Maximum compatibility, social media, streaming
WebM	VP9 web-optimized video	HTML5 web embedding, Chrome/Firefox
MOV	Apple QuickTime container	Apple ecosystem, Final Cut Pro
AVI	Legacy video container	Older software compatibility
MKV	Matroska multimedia container	Multiple tracks, high quality archival

Tips & Best Practices

Choose MP4 (H.264) for the widest compatibility — it plays on virtually every device and platform.

Use WebM for web embedding if your audience primarily uses Chrome or Firefox for smaller file sizes.

Converting from a modern codec (H.265) to H.264 ensures playback on older devices that lack HEVC support.

For the best quality, convert from the original source file rather than from a previously compressed version. After converting, trim out unwanted sections.

How It Works — 100% Private Processing

FyleTools uses FFmpeg compiled to WebAssembly to decode the source video and re-encode it to your chosen format directly in your browser. Hardware acceleration is used when available for faster encoding. No video data is transmitted to any server.