Convert WebM to MP4 in Seconds

Got a WebM that won't play outside the browser? Cacao Docs converts it to MP4 instantly — free, private, zero installs.

Instant WebM to MP4

No Signup Required

Works on Any Device

1.5M users

18,243 reviews

Drop your files here

Size up to 1024 MB

How It Works

Three steps. No installs. Done in minutes.

Upload Your WebM. Drag your WebM file into Cacao Docs or click to browse. Screen recordings, browser downloads, YouTube saves — any WebM works.

Cacao Docs Converts It. Our engine remuxes your WebM into a clean MP4 in seconds. High quality, fast, no settings to mess with.

Download Your MP4. Grab your MP4 and you're sorted. Plays on any phone, TV, browser, or video editor — no more "format not supported" grief.

Your Complete Audio & Video Toolkit

Transcribe, convert, extract — everything audio & video, handled in one place.

AI Transcription

Speech to text with speaker labels, timestamps, and 95%+ accuracy.

Format Conversion

MP3, WAV, M4A, OGG, FLAC — convert any audio or video format instantly.

Video to Audio

Extract audio from MP4, YouTube, Zoom recordings, and more.

Lightning Fast

Most files processed in under three minutes. No waiting around.

No Signup

Start instantly

100% Secure

Auto-deleted

Browser-Based

No installs

People Love These Tools

Podcasters, researchers, marketers, and remote teams use our audio & video tools every day.

Feb 17

My screen recordings finally work everywhere

I record tutorials in WebM and nothing would play them outside Chrome. Cacao Docs converted them all to MP4 and now they work on every device my clients use. Total lifesaver.

Dana Korhonen

Feb 2

Fast, clean, no drama

Converted a 1-hour WebM lecture to MP4 in under two minutes. Quality was spot on. Cacao Docs is genuinely the best free tool I've used for this — no fluff, just results.

Nico Bauer

Jan 30

No sign-up, no watermark, perfect

Every other site I tried slapped a watermark on or demanded an account. Cacao Docs just converted my WebM and let me download it. Bookmarked immediately.

Aisha Mensah

2427 people converted files today

@mel****

15 mins ago

@max****

10 mins ago

@sue**

9 mins ago

Trusted and Secured by Industry Experts

Why People Pick Our Audio & Video Tools

Plays Literally Everywhere

WebM is great for the web but a nightmare outside it. MP4 works on iPhones, Android, Smart TVs, video editors, and every streaming platform. Cacao Docs gets you there in one click.

No Quality Loss

Cacao Docs converts your WebM to MP4 while keeping the video and audio quality intact. Sharp picture, clean sound — what goes in comes out.

Perfect for Screen Recordings

Browser screen recorders often spit out WebM. Cacao Docs converts those recordings to MP4 so you can share them, edit them, or upload them anywhere without a second thought.

Batch It Up

Got a stack of WebM files to convert? Cacao Docs lets you queue them up and knock them out back to back. No repetitive uploading, no wasted clicks.

Transcribe the Audio After

Once you have your MP4, run it through Cacao Docs AI transcription to pull out subtitles, captions, or a full text transcript. One platform, full workflow.

Encrypted & Auto-Deleted

Your video is locked with encryption on upload and wiped from Cacao Docs servers the second conversion is done. Zero data stored, zero risk.

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Frequently Asked Questions

Quick answers about our audio & video transcription and conversion tools.