WebM to MP4 Converter

Fix playback issues on iPhone and Premiere by converting WebM to MP4.

4.8/5 - 2,105 votes

Drag & Drop WebM files here

or click to browse from your device

How to Convert WebM to MP4?

Make your web videos compatible with everything in 3 clicks.

Upload WebM

Drag & drop your .webm file. We support VP8, VP9, and AV1 encoded videos.

Convert

Our server transcodes the web-optimized stream into a universally compatible format.

Download

Save your new MP4. It will now work on your iPhone, TV, and editing software.

Why convert WebM?

While WebM is great for browsers, MP4 is required for most video editing software and native videoplayers on mobile devices (especially iOS).

Engineering Philosophy

From Web Only to Universal.
Unlocking WebM Video.

WebM is fantastic for the web. Built by Google, it offers high-quality video (VP8/VP9) at small file sizes, perfect for streaming in browsers like Chrome and Firefox.

However, step outside the browser—to an iPhone, a smart TV, or Adobe Premiere—and WebM often fails to load.

RiseConvert's WebM Decoder Engine bridges this gap. We re-encode the highly compressed WebM streams into standard H.264 MP4, ensuring your video plays effortlessly on every device in existence, without sacrificing the quality you started with.

100% Compatibility Guaranteed

Edit Anywhere

Import converted files directly into Premiere, DaVinci, or Final Cut.

Smooth Playback

Hardware accelerated decoding on 99% of devices.

Universal Standard

Works on iOS, Android, Windows, Mac

WebM vs. MP4: Usage Matter

WebM is an open media file format designed for the web. It uses efficient codecs like VP8 and VP9 to deliver high-quality video at low bitrates, making it ideal for streaming on sites like YouTube (in Chrome).

MP4 (MPEG-4 Part 14) is the industry standard container. It uses H.264 video and AAC audio, which have hardware support on almost every graphic card and mobile chip made in the last 15 years.

Converting WebM to MP4 removes the playback limitations, effectively "unlocking" the video for use outside of a web browser.

Format Snapshot

Feature

WebM (Web only)

MP4 (Universal)

Developer

Google

MPEG Group

Primary Use

HTML5 Streaming

Everything

iOS Support

Limited / None

Native

Editing Support

Poor (Requires plugins)

Excellent

Codecs

VP8, VP9, AV1

H.264, HEVC

The Compatibility Challenge

The main reason users convert WebM files is the "walled garden" effect. Apple's ecosystem (iOS, macOS, Safari) has historically resisted native support for WebM, preferring their own standards or universal ones like MP4/H.264.

Furthermore, video editors like Adobe Premiere Pro often struggle to import WebM files without third-party plugins. By converting to MP4, you create a "mezzanine" file that is robust, editable, and shareable anywhere.

Tech Glossary

VP9

A video coding format developed by Google. It is the primary codec used in WebM files and YouTube.

Container

The 'box' that holds video and audio. WebM and MP4 are containers. They hold the streams inside.

Transcoding

The process of converting one form of encoding (VP9 in WebM) to another (H.264 in MP4).

HTML5 Video

The modern standard for playing video on the web without plugins like Flash. WebM is a key part of this.

Common Issues & Solutions

Transparency Lost?

WebM supports transparent backgrounds (alpha channels). Standard MP4 does not. Conversion will usually result in a black background.

File Size Increase?

WebM is extremely efficient. Converting to MP4 might slightly increase file size to maintain the same visual quality.

No Audio?

Some WebM files use Vorbis/Opus audio. We automatically convert this to AAC for full MP4 compatibility.

Tool Specs

Input.WEBM

Output.MP4 (H.264)

CodecsVP8/9 to H.264

Privacy Encrypted

Secure Processing

Files are processed in a secure environment and automatically deleted after 2 hours.

User Feedback

"I record everything in OBS as WebM. This tool lets me quickly convert them for Premiere Pro."

Liam K.

Content Creator

"Finally a tool that handles VP9 WebM files correctly without glitching."

Sarah W.

Web Dev

Frequently Asked Questions

Can I play the converted MP4 on iPhone?

Yes! This is the main benefit. WebM often doesn't work on iOS, but our MP4 output works perfectly in Photos and Safari.

Will I lose transparency?

Yes, unfortunately. Standard MP4 (H.264) does not support transparent backgrounds. The transparent parts will likely become black.

How long does it take?

WebM files are usually small, so conversion is very fast. Most clips finish in seconds.

Is it high quality?

Yes. We use high-quality encoding presets (CRF) to ensure the visual fidelity matches the original.

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