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 audio files from OPUS to AAC format quickly and efficiently. This tool is ideal for users who need to make OPUS files compatible with hardware or software that only supports the AAC standard.
OPUS is a highly versatile audio codec often used for streaming and VoIP due to its low latency and high efficiency. AAC (Advanced Audio Coding), on the other hand, is the industry standard for media containers used by Apple and many embedded systems. When converting from OPUS to AAC, you are essentially re-encoding audio from one lossy codec to another. Because both formats use different compression algorithms, the underlying data structure is recalculated during the conversion process.
Since both OPUS and AAC are lossy formats, re-encoding will result in a generational quality loss. The file size will remain relatively unchanged as both formats are designed for efficient compression.
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.
Music, podcasts, voice recordings, and sound effects.
Common extensions: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS
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
Clips, streams, screen recordings, and movies.
Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG
