Free online Opus Audio to M4A Audio converter. Files are processed locally in your browser — no uploads, 100% private.
Drop your .OPUS file here
or click to browse from your device
100% browser-based — no server uploads, no cloud processing
Free forever — no account or subscription required
Supports batch conversion for multiple files at once
Works on any device — desktop, tablet, and mobile
Results available in seconds — no server queue or wait time
Files are cleared immediately after processing for maximum privacy
Modern low-latency codec by Xiph — best quality-to-size ratio
AAC audio in MPEG-4 container — iTunes and Apple default
M4A is an industry-standard format with universal support
Source: Modern low-latency codec by Xiph — best quality-to-size ratio
Output: AAC audio in MPEG-4 container — iTunes and Apple default
100% browser-based processing — files never leave your device
Lossy formats permanently discard audio data
Uncompressed formats produce impractically large files
DRM restrictions may limit playback in some players
Music streaming and podcast distribution
Ringtones, alerts, and notification sounds
Video soundtrack and background music delivery
High-quality archiving and master backups
Always start from the highest-quality source: lossless to lossy, never lossy to lossy
For streaming, target -14 LUFS (Spotify) or -16 LUFS (podcasts) for consistent loudness
Sample rate and bit depth matter more than codec choice at equivalent bitrates
Preview converted audio before distribution to catch artifacts early
Drag & drop your file or click to browse
Files are processed instantly in your browser
Save your converted or processed file
Upload your OPUS file using the drop zone above. Your file is instantly converted to M4A format right in your browser — no server upload, no waiting.
Completely. Our converter processes your OPUS file 100% in your browser using client-side code. It never leaves your device or touches any external server.
It depends on the formats. Converting from lossless to lossy (e.g. PNG to JPEG) may reduce quality. Converting lossless-to-lossless (e.g. PNG to WebP lossless) preserves all quality.
Free, instant, and 100% private. Your files are processed locally in your browser.