Convert WebM to MP4
Select Files
Audio, Video and Image supported. Drag or click
Transform WebM files to MP4 format right in your browser. Zero upload, zero storage, zero risk. Just select your files and convert.
How It Works
Drop Your WebM Files
Drag and drop or click to browse. We accept multiple files at once.
Review & Convert
Preview your files, adjust quality if needed, and start the conversion to MP4.
Download Converted Files
Your MP4 files are ready. Download them all in one click.
About These Formats
You typically convert WebM to MP4 when a WebM clip — often recorded from a browser, OBS, or downloaded from a web source — refuses to play in software that only speaks H.264 plus AAC inside an MP4 container. Final Cut Pro, Adobe Premiere, DaVinci Resolve, PowerPoint, QuickTime on macOS, and most smart TVs all expect MP4. Social platforms like Instagram, TikTok, X, and LinkedIn also reject WebM uploads outright, so MP4 is the safe lingua franca for distribution. Under the hood you are repackaging VP9 or VP8 video and Opus audio into an MP4 wrapper with H.264 video and AAC audio so hardware decoders on phones, tablets, and game consoles can play it without falling back to slow software decoding. WeLoveConvert handles the full re-encode locally in your browser through FFmpeg compiled to WebAssembly, so even bulky clips stay private. For best results, keep the source resolution, set CRF around 23 for visually lossless 1080p, and enable the +faststart flag so the moov atom moves to the start of the file for instant streaming.
Frequently Asked Questions
How do I convert WebM to MP4?expand_more
Upload your files, confirm the conversion settings, and download your converted files. All processing happens in your browser — no server upload required.
Is this WebM to MP4 converter free?expand_more
Yes, completely free with no hidden fees. No sign-up required, no usage limits. All conversion happens in your browser.
Is it safe to convert WebM to MP4 online?expand_more
Your files never leave your device. All conversion happens locally in your browser using WebAssembly technology. We have zero access to your files.
Will I lose quality converting WebM to MP4?expand_more
Quality depends on the target format and your settings. Lossless formats like PNG preserve original quality. For lossy formats like JPG, you can adjust the quality slider.
Can I convert multiple WebM files at once?expand_more
Yes, you can convert multiple files at once. Simply drag all your files into the upload area or click to select them.
Common Issues
- infoRe-encoding VP9 to H.264 always loses some quality — the output is lossy, never byte-identical to the source.
- infoOpus audio is converted to AAC, which can soften high-frequency detail in music tracks at lower bitrates.
- infoWithout the +faststart flag, the file plays only after a full download — streaming and seeking will fail.
- infoAny subtitle tracks embedded in the WebM are typically dropped, since MP4 expects a different subtitle format.