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 OPUS audio files to FLAC format effortlessly using our online tool. This transition is ideal for users who need compatibility with professional audio equipment that does not support the OPUS container.
OPUS is a highly efficient lossy audio codec designed for low-latency streaming and internet communication, offering great quality at low bitrates. In contrast, FLAC is a lossless audio codec that preserves the original audio data perfectly but does not compress it as aggressively as OPUS. When you convert from OPUS to FLAC, you are shifting from a lossy container to a lossless one, which results in a significantly larger file size as the audio data is unpacked into a more robust, uncompressed structure.
Please note that since OPUS is a lossy format, the original audio information lost during the initial encoding cannot be restored; the FLAC file will maintain the quality of the OPUS source without adding further degradation.
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
