WEBM to MP4 converter: WebCodecs and FFmpeg support icon

WEBM to MP4 converter: WebCodecs and FFmpeg support

by dreambuilder.first Β· Tools
FeaturedManifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

🎬 Convert WEBM to MP4 instantly and securely. No server uploads, unlimited file conversions, works locally in your browser.

Users
4,000
0 in 30 days
Rating
4.3 / 5
+0.03 in 30 days
Ratings
22
+1 in 30 days
Store rank
#15K
#13K among extensions
Version
1.4.0
updated 4 Dec 2025

Users

monthly, 2 years
02,0004,000Oct 2024Nov 2025Oct 2026
Latest, 15 Oct 2026: 4,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 years
01122Oct 2024Nov 2025Oct 2026
Latest, 15 Oct 2026: 22 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About WEBM to MP4 converter: WebCodecs and FFmpeg support

🎬 Fast WebM to MP4 Converter - Browser-Based & Private Transform WebM videos to MP4 format directly in your browser. No uploads, no privacy risks, no waiting. Convert unlimited videos with our fast, secure tool that works even offline. βœ… KEY BENEFITS: β€’ 100% Browser-based - No server uploads or internet needed β€’ Privacy-focused - Files never leave your device β€’ Dual converter options - Choose between WebCodecs API (faster, modern) or FFmpeg (universal compatibility) β€’ Lightning-fast conversions with adjustable quality settings β€’ Unlimited free conversions with bulk processing β€’ Auto file detection on webpages with one-click conversion β€’ Customizable default converter in settings βš™οΈ CONVERSION OPTIONS: β€’ Two Converter Engines: - WebCodecs API: Modern browser API, fastest conversion, requires Chrome 94+ - FFmpeg (WebAssembly): Universal compatibility, works in all browsers β€’ Speed Modes: - Turbo Mode: Prioritizes speed while maintaining good quality - Normal Mode: Maximum quality output for professional content - Boost Mode: Perfect balance between speed and quality β€’ Video Codec Selection (WebCodecs): Choose H.264 (best compatibility) or H.265 (better compression) πŸ”„ HOW IT WORKS: 1. Install the extension 2. Upload your WebM file or use auto-detection on websites 3. Choose your conversion settings 4. Get your MP4 instantly downloaded to your device πŸ“± UNIVERSAL COMPATIBILITY: Convert WebM to MP4 for seamless playback across all devices, platforms, and social media sites. No more compatibility issues with video files! πŸ› οΈ ADDITIONAL FEATURES: β€’ Conversion notifications β€’ Auto-download option β€’ Support for other video formats (AVI, MKV, FLV, etc.) β€’ File size limit of 2-4GB (browser-dependent) β€’ Options page to customize default converter preference πŸ’‘ WHY CHOOSE MP4 FORMAT? β€’ Universal compatibility across all devices and players β€’ Better for sharing on social media platforms β€’ Easier to edit in most video editing software β€’ Smaller file sizes without quality loss πŸ” PERFECT FOR: β€’ Social media creators needing to convert WebM videos for Instagram, Facebook, or TikTok β€’ Professionals who need quick video format conversions without complex software β€’ Anyone who downloads WebM videos from the web and needs MP4 compatibility β€’ Content creators who need to share videos across multiple platforms β€’ Students working with video files for presentations and projects πŸš€ PERFORMANCE BENEFITS: Our WebM to MP4 converter offers two powerful conversion engines to suit your needs: β€’ WebCodecs API Converter: Leverages native browser APIs for ultra-fast conversions. Uses your GPU acceleration when available, providing the fastest conversion speeds possible. Perfect for modern browsers (Chrome 94+, Edge 94+). β€’ FFmpeg WebAssembly Converter: Uses proven FFmpeg technology compiled to WebAssembly for universal compatibility. Works in all browsers and provides reliable, high-quality conversions with extensive format support. πŸ’‘ Both converters process videos entirely on your device using advanced compression algorithms to maintain high video quality while reducing file size. The browser-based technology leverages your computer's processing power for faster conversions than cloud-based tools, without any privacy concerns. ❓ FAQ: β€’ Is this extension really free? Yes, completely free with unlimited conversions β€’ Does it work offline? Yes, after installation, you can convert videos without internet β€’ Will my videos lose quality? No, our converter maintains the original quality β€’ What's the file size limit? 2-4GB depending on your browser and device β€’ Can I convert multiple files at once? Yes, bulk conversion is supported β€’ Will my files be uploaded anywhere? No, all processing happens locally on your device β€’ Which converter should I use? WebCodecs is faster and recommended for Chrome/Edge users. FFmpeg works in all browsers and offers broader format support β€’ Can I change the default converter? Yes, use the settings button (gear icon) or go to extension options to set your preference πŸ‘¨β€πŸ’» TECHNICAL DETAILS: β€’ Dual conversion engines: WebCodecs API and FFmpeg WebAssembly β€’ WebCodecs: Native browser API with GPU acceleration support β€’ FFmpeg: WebAssembly-based for universal browser compatibility β€’ Supports VP8/VP9 WebM to H.264/H.265 MP4 conversion β€’ Video codec selection: H.264 (AVC) for compatibility or H.265 (HEVC) for better compression β€’ Preserves original video metadata (when selected) β€’ Customizable bitrate and quality settings β€’ Smart track copying: Automatically copies compatible tracks without re-encoding for faster conversions β€’ Minimal system resource usage during conversion β€’ Options page to set your preferred default converter πŸ“§ Need help? Contact us: dreambuilder.first@gmail.com Download our WebM to MP4 Converter extension now and start converting videos in seconds! Experience the fastest, most private way to transform WebM videos to universally compatible MP4 format.

Growth

WindowUsersChangeRatingsRating
7 days0+0.0%+1+0.03
30 days0+0.0%+1+0.03
6 months0+0.0%+2+0.07
1 year+1,000+33.3%+7+0.19

Chrome Web Store search rankings

Where WEBM to MP4 converter: WebCodecs and FFmpeg support appears when people search the store, with the 30 day change
Search phrasePosition30 days
support#67new

Version history

11 versions recorded
1.4.04 Dec 2025
1.3.026 Nov 2025
1.2.08 Apr 2025
1.1.07 Jan 2025
1.0.102 Dec 2024
1.0.919 Nov 2024
1.0.82 Nov 2024
1.0.72 Nov 2024

Details

Category
Tools
First seen
30 Sep 2024
Size
10.1 MB
Languages
de, en, fil, id, sw, ms, nl, vi
Pricing
Free
Privacy policy
docs.google.com
Extension ID
mfjlolbldcokknaeaaphebndgeicolfm

Permissions and risk

Minimal riskimpact 3, likelihood 0
Permissions
tabsscriptingnotificationsstoragecontextMenus
Site access
<all_urls>
Can read and change data on every website you visit.

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