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Video Converter

Convert video between MP4, WebM, MOV, and MKV locally, or save the soundtrack as M4A, Opus, or WAV, rewrapping without quality loss when the codecs allow it and converting several files into a ZIP.

Know your workflow

Supported files and how to use.

Check supported input/output details and follow the tool steps before exporting.

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Technical specs and decision signals

Use these specs to confirm browser fit, privacy boundaries, and export behavior before you convert a video.

Cost

Free, with no signup.

Security

Reading, converting, and export run in your browser; the video is not uploaded to ToolBuddy.

Input

MP4, MOV, WebM, or MKV video, up to 2 GB on desktop and 250 MB on mobile.

Output

MP4 (H.264 or VP9, AAC or Opus), WebM (VP9, Opus), MOV (H.264, AAC), MKV, or audio only as M4A, Opus, or WAV.

Rewrap

Tracks the target can hold are copied with no quality loss.

Re-encode

Only tracks the target cannot hold, at high quality, or when you cap the resolution or frame rate.

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How to use

Check supported input/output details and follow the tool steps before exporting.

01

Select or drop an MP4, MOV, WebM, or MKV video, or add several.

02

Pick MP4, WebM, MOV, MKV, or an audio format; each shows what will be copied and what re-encoded.

03

Optionally open More options to cap the resolution or frame rate, or set the quality.

04

Convert and download the video, or the ZIP when you converted several.

Guide

Learn, decide, and apply.

Understand how to convert video in the browser, why it matters in repeat workflows, and when to use this tool with confidence.

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Lossless rewraps, honest re-encodes

  • Runs on your device, so private videos are never uploaded.
  • Rewraps without re-encoding whenever the target allows it.
  • Shows, before you export, exactly what will be re-encoded.
  • Turns off formats your browser cannot write properly, with the reason.
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Get the format the next step needs

  • Turn a WebM screen recording into an MP4 that plays everywhere.
  • Rewrap an iPhone MOV as MP4 without re-encoding.
  • Make a WebM for a website from an MP4.
  • Get a MOV for a QuickTime-based editing workflow.
  • Save the soundtrack of a video as an M4A or WAV file.
About

About Video Converter

Convert video in the browserLossless rewraps, honest re-encodesGet the format the next step needs

Rewrap first, re-encode only when needed

A video file is a container holding a video track and usually an audio track. When the target container can hold those tracks as they are, the converter copies them, which takes seconds and changes nothing in the picture or sound.

When it cannot, for example H.264 video into WebM, that track is re-encoded at high quality and the other is still copied.

Clear about what happens

Every format choice says, before you export, whether the video and audio are copied or re-encoded and into what. Your current format is shown but not offered, since converting to it would change nothing.

Formats your browser cannot write correctly are turned off with the reason, rather than producing a file that will not play.

Local processing and honest limits

The video is read in place on your device, and any re-encoding uses the browser's own encoders, so nothing is uploaded.

Firefox cannot encode AAC audio, so there an MP4 whose audio must be re-encoded carries Opus instead, with a note, and MOV is turned off. Desktop browsers handle files up to 2 GB; phones and tablets up to 250 MB.

FAQ

Common questions.

Have more questions? Reach out via our contact page and we will respond within 24 hours.

Is my video uploaded?

No. The video is read and converted in your browser, and the file never leaves your device.

Does converting lose quality?

Only when it has to. When the target format can hold the video's codec, the tool rewraps it without re-encoding, so nothing changes but the container. When it cannot, that track is re-encoded at high quality.

Which formats can I convert to?

MP4, WebM, MOV, and MKV, or just the soundtrack as M4A, Opus, or WAV. Each choice shows, before you export, whether the video and audio are copied or re-encoded. You can also add several videos and convert them all to one format, saved together in a ZIP.

Why is MOV unavailable in my browser?

QuickTime files expect AAC audio, and some browsers, Firefox among them, cannot encode AAC. If your audio would need re-encoding, MOV is turned off and the reason is shown.

Why does my MP4 have Opus audio?

In browsers without an AAC encoder, such as Firefox, MP4 audio that must be re-encoded is written as Opus. Current Chrome, Edge, Firefox, and Safari play it; some older players may not.

How large a file can I convert?

Up to 2 GB on desktop and 250 MB on phones and tablets.

Use cases

Popular workflows.

See real workflows where this tool fits naturally, then jump straight into the matching guide.

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Video Compressor

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Video Trimmer

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Audio Format Converter

Continue from Video Converter into audio format converter for the next step in the workflow.

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Guides

Learn with practical workflow guides.

Read intent-focused guides, then jump straight into the live tool workflow.

View all guides

Video Converter use cases

Practical workflows and common jobs you can handle with Video Converter.

Open guide

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