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 into AAC audio tracks with our streamlined tool. This conversion is ideal for extracting soundtracks from clips for personal music libraries or audio-only playback.
MP4 is a versatile multimedia container designed primarily for video, while AAC is a dedicated audio container known for high efficiency. During this process, our converter strips the video stream and isolates the audio layer, re-encoding it into the AAC format. Because both formats utilize lossy compression, the conversion involves transcoding from one compressed state to another.
Since both formats use lossy compression, repeated re-encoding may lead to minor generation loss. However, high-bitrate AAC settings ensure the audio quality remains nearly indistinguishable from the original MP4 soundtrack.
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
