Any file up to 500 MB. Drop several files and they come back as one ZIP. Many image, audio and video conversions run in your browser; anything else is uploaded and removed within the hour.
Convert WEBM video containers into M4A audio containers instantly with ConvertX. This tool extracts the audio track from web video files so you can play them on Apple devices and standard music players.
WEBM is a web-optimized media container primarily designed for video streaming on the internet using VP8, VP9, or AV1 video codecs alongside Opus or Vorbis audio. M4A is an audio-only media container standard most commonly associated with AAC encoding, heavily utilized by Apple's ecosystem. During this video-to-audio conversion, the video stream is completely discarded, and the audio stream is repackaged or re-encoded into an M4A-compatible format, allowing you to isolate sound tracks from web downloads or screen recordings.
Because this is a video-to-audio extraction, audio fidelity depends entirely on the original WEBM soundtrack; converting to M4A preserves existing clarity without introducing noticeable degradation if the bitrate is matched properly.
We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.
Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.
Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.
A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.
Clips, streams, screen recordings, and movies.
Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG
Raster and vector graphics for web, print, and photography.
Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF
Office files, PDFs, ebooks, and plain text.
Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT
Music, podcasts, voice recordings, and sound effects.
Common extensions: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS
