Which format is the most universal?

MP4 works on most devices and social networks.

Any re-encoding can cause a small loss; keep the original.

What is the difference between format and codec?

The format (MP4, WEBM, MOV, MKV) is the file’s “box”. The codec is how the video and audio inside it were compressed. Two MP4s can use different codecs.

Why will the video not convert?

It may have a codec your browser cannot decode or be too large for the device’s memory. Try another browser (such as Chrome) or a smaller file.

Yes, the video is converted together with the audio track.

Can I convert several videos?

Prefer converting one at a time: videos weigh heavily on the browser’s memory.

Is there a watermark or a duration limit?

There is no watermark. The practical limit is what your device can handle.

Convert your video to the format you need

Convert MP4, WEBM, MOV and MKV. Choose the quality, trim a clip if you like, and download the result — without leaving your browser.

Drag your video here or click to choose

MP4, MOV, WEBM or MKV — one file at a time

Fast conversion (remux)🎬 MP4, WEBM, MOV, MKV⚡ 100% private

Most searched conversions

Each conversion has its own page, with the step by step, tips and the limits of what it does.

To MP4

MOV, MKV, WebM, TS and others

Turn videos into MP4 to open on any device.

Other formats

WebM and MOV

Take an MP4 to WebM or to MOV.

Trim and preserve quality

Trim a clip or convert preserving the picture whenever the format allows.

How does the WebFaz video converter work?

The converter turns your video file into another format (container). Video demands much more processing than audio, so this app works with one file at a time, to keep it stable.

1. Choose the video. Drag the file to the marked area or click to select it on your device.

2. Choose the format. Select the output format you want (MP4, WEBM, MOV or MKV). When the output format accepts the same codec as the original file, the conversion is practically instant and lossless; otherwise, the video is re-encoded.

3. Adjust if needed. With “Auto”, the original quality is preserved whenever possible. To save only a part, turn on “Trim clip” and enter the start and end in hours:minutes:seconds.

4. Convert and download. Click “Convert video” and wait for it to finish. Then use “Download video” to save the result. The original file stays on your device.

About Video Converter

Converts videos between MP4, WEBM, MOV and MKV so they are compatible with the target device or program.

A practical example

A video recorded in MOV on an iPhone will not open in the subtitle program on your computer. You upload the file, choose MP4 as the output format, convert and download the result. The new MP4 opens in the program and can also be posted on social networks with no format complaints.

How to use it

Upload the video.
Choose the output format.
Convert.
Download the result.

Limits and cautions

Large files demand memory and time from your device.
Some rare codecs may not be supported by the browser.

A ferramenta em uma imagem

Os pontos de clique estão numerados. Toque na imagem para vê-la em tamanho original. As demais telas, passo a passo, estão no guia “Como funciona”.

WebFaz Video Converter with the original video, the space for the converted video, the MP4, WebM, MOV and MKV output formats and the quality options. — **Video converter: output format and quality.**
Point 1: Choose the video to convert.
Point 2: Output format: MP4 works on most devices; WebM, MOV and MKV are the alternatives.
Point 3: Quality: keep the original or choose High, Medium or Compact.

When to use it

Opening, in a program or on a TV, a video recorded in a format it does not recognize.
Converting MOV from an iPhone or camera to MP4, which is more widely accepted on social networks and editors.
Generating WEBM for use on web pages.

Tips

If the only problem is the size, use video compression instead of converting.
Keep the original file until you have checked the result: any re-encoding can lose a little quality.
Prefer MP4 when you do not know the target format; it is the most widely accepted.

What happens in your browser

The video is read and re-encoded by the browser itself, using its native video and audio features (WebCodecs) with container-packaging libraries. There is no server involved.

Format is one thing and codec is another. MP4, WEBM, MOV and MKV are containers; inside them go the video and the audio, compressed by codecs such as H.264 or VP9. Converting changes the container and, when needed, re-encodes the content.

Because the work is done by your device, the time depends on the video’s size and the machine’s power. The tab needs to stay open until it finishes.

Read the full guide: real-world use cases, tips and limits →

Privacy: This tool runs entirely in your browser: your files and data are not sent to any WebFaz server. Learn more.

Perguntas frequentes

Which format is the most universal?: MP4 works on most devices and social networks.
Do I lose quality?: Any re-encoding can cause a small loss; keep the original.
What is the difference between format and codec?: The format (MP4, WEBM, MOV, MKV) is the file’s “box”. The codec is how the video and audio inside it were compressed. Two MP4s can use different codecs.
Why will the video not convert?: It may have a codec your browser cannot decode or be too large for the device’s memory. Try another browser (such as Chrome) or a smaller file.
Is the audio kept?: Yes, the video is converted together with the audio track.
Can I convert several videos?: Prefer converting one at a time: videos weigh heavily on the browser’s memory.
Is there a watermark or a duration limit?: There is no watermark. The practical limit is what your device can handle.