MP4 to WebM
Convert MP4 videos to WebM – free in browser
Why MP4 → WebM?
WebM is an open video format optimized for the web. It offers good compression and is supported by all modern browsers. Directly in the browser, no upload.
Frequently Asked Questions
What is WebM?
WebM is an open video format developed specifically for the web. It is natively supported by all modern browsers and offers efficient compression.
Are my files safe?
Yes, 100%. Your video files are never uploaded to a server. The conversion happens entirely locally in your browser.
Is the conversion free?
Yes, wandlio.de is completely free. No registration, no limits, no ads.
About WebM
WebM was released by Google in 2010 as a royalty-free video format for the web and is a profile of the Matroska container (MKV). WebM initially used VP8 for video and Vorbis for audio, with later versions supporting VP9 and AV1 for video and Opus for audio. The format was developed in response to the licensing issues surrounding H.264, whose MPEG-LA patents required licensing fees. YouTube automatically transcodes all uploaded videos to WebM, and the format is natively supported by Chrome, Firefox, and Edge. Safari only supported WebM starting with version 15 (2021). WebM with AV1 offers the best compression of all current web video formats but requires more computational power for encoding and decoding. For web video, WebM is the most important format alongside MP4, with MP4 offering broader compatibility and WebM representing the patent-free alternative.
About MP4
MP4 (MPEG-4 Part 14) was standardized in 2001 as ISO 14496-14 and is the most widely used container format for video and audio worldwide. Based on Apple QuickTime format (MOV), MP4 can hold various codecs, most commonly H.264/AVC or H.265/HEVC for video and AAC for audio. The format supports streaming via HTTP Live Streaming (HLS) and Dynamic Adaptive Streaming (DASH), subtitles, chapters, metadata, and multiple audio and video tracks. MP4 is the standard format for YouTube, Vimeo, Netflix, and social media platforms. The broad codec support and compatibility with virtually every device and browser make MP4 the safe choice for video distribution. MP4 files can also contain pure audio (M4A) or images. The ISO Base Media File Format standard on which MP4 is based is also the foundation for 3GP, HEIF, and other container formats.
Why convert MP4 → WEBM?
MP4 (MPEG-4 Part 14) is the standard video container format for web, mobile, and streaming. It contains video (H.264/H.265) and audio (AAC) in a widely supported format. Converting to WEBM is required when you need to extract the audio track (MP3, WAV for podcasts or music editing), need a different video format (AVI for legacy systems, MOV for Mac workflows, WebM for open web standards), or want to create an animated GIF version for social media or presentations. WebM is an open video format for HTML5 video with VP9 video and Opus audio, optimized for web streaming.