OptiConverter

Convert video files online

Convert supported video files to MP4, WebM, MOV, or MKV for playback and sharing.

or drag and drop files here. Up to 50 MB each.
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Temporary files removed after responseSecure processingNo signup

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Convert video files online

Upload a supported video, choose an output container, and download the converted file. Video conversion runs on the server and requires FFmpeg. Processing time depends on file size, codec, and server resources.

Why use this video converter?

  • Convert supported video containers for a target player or workflow.
  • Codec support inside the container still affects device playback.
  • Keep your source video until you have checked the converted file.

MP4 vs WebM

FeatureMP4WebM
Typical useGeneral playback and sharingWeb-oriented workflows
CompatibilityBroadly supported; codec dependentModern browsers and players; codec dependent
File sizeDepends on codec and bitrateDepends on codec and bitrate

How to use this video converter

  1. Choose a supported file from your device or drag it into the upload area.
  2. Select an available output format, then start the conversion.
  3. Download the converted file when processing is complete.

Frequently asked questions

Which video formats can I convert?

Supported inputs include MP4, MOV, MKV, WebM, AVI, and M4V. Available outputs are MP4, WebM, MOV, and MKV.

Why is video conversion taking a while?

Video conversion is resource-intensive. Duration, resolution, codec, file size, and server load can affect processing time.

Is this tool free to use?

Yes. The converter is free to use and does not require an account.

Can I convert several files at once?

The tool processes one uploaded file per conversion. Run each file separately.

How large can my upload be?

The server accepts uploads up to 50 MB. Common browser-based image conversions are limited to 25 MB and 40 megapixels.

How are uploaded files handled?

Server conversions use temporary files that are removed after the response finishes. Browser image conversions run locally; hosting logs and optional OCR providers are controlled by the site operator. See the privacy page for details.