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 OPUS audio tracks effortlessly. This tool is ideal for extracting high-quality sound from video content for playback on audio-only devices.
MP4 is a versatile video container that bundles video, audio, and subtitles, while OPUS is an advanced, lossy audio codec designed for low-latency streaming and high-fidelity sound. When you convert MP4 to OPUS, our service performs a format transition from a video container to a specialized audio-focused structure, isolating the audio stream and re-encoding it into the highly efficient OPUS format.
Since both formats use lossy compression algorithms, converting between them involves re-encoding, which may lead to minor generation loss in sound fidelity.
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
