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 your MP4 video files to M4A audio format instantly. This tool is perfect for users who want to extract music or speech from video clips for audio-only playback.
MP4 is a versatile multimedia container designed primarily for video, while M4A is a container specifically optimized for audio, usually utilizing the AAC or ALAC codecs. When you convert MP4 to M4A, the video stream is discarded, and the audio track is repackaged into the M4A structure. This process is highly efficient because both formats often share the same underlying audio encoding, allowing the conversion to proceed without re-encoding the audio stream in many cases.
Since the audio data is typically preserved as-is, there is virtually no loss in sound quality during this conversion process.
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
