CONVERT W64 → OPUS (W64 to OPUS)
Fast, secure W64 to OPUS conversion. No registration required.
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HOW TO CONVERT W64 → OPUS
Upload the W64
Drop or select your W64 file. The upload is encrypted and the file is queued for conversion.
Transcode via FFmpeg
FFmpeg decodes the W64 stream to PCM internally, then re-encodes as OPUS at the bitrate you select.
Download the OPUS
The OPUS is delivered as a direct download; metadata and cover art transfer automatically where possible.
Why this pair exists — W64 is an audio format with specific trade-offs between file size, bitrate flexibility, and device support. Ergo, the OPUS route. Need a OPUS version of a W64 recording for a podcast host, audio book platform or DAW that refuses the original container? Drop the file above and our encoder produces a clean OPUS you can drag straight into the destination tool. Metadata such as title, artist and cover art travels with the audio. A quick refresher — W64 is an audio format with specific trade-offs between file size, bitrate flexibility, and device support. By contrast, Opus is the modern low-latency royalty-free codec used in VoIP, streaming, and WebRTC.
Why convert W64 to OPUS
Sony Wave64 is great in its own niche, but Opus Audio is either more universally playable or better suited to the device you are targeting. Converting lets you ship the audio without asking listeners to install a codec. The loss in quality between the two is negligible at sensible bitrates.
W64 vs OPUS — Technical specifications
Side-by-side comparison of the technical details.
W64
- MIME type
- audio/x-w64
- Extension
- .w64
- Max size
- 2^64 bytes
- Relative
- RF64 (EBU 64-bit WAV)
- MIME Type
- audio/x-w64
- Category
- Audio Files
- Full Name
- Sony Wave64
- Conversion Engine
- FFMPEG
OPUS
- MIME type
- audio/opus
- Extension
- .opus
- MIME Type
- audio/opus
- Category
- Audio Files
- Full Name
- Opus Audio
- Conversion Engine
- FFMPEG
- Extensions
- .opus, .ogg (container)
- Standard
- RFC 6716 (2012)
- Sample rates
- 8, 12, 16, 24, 48 kHz
- Latency
- 5-60 ms (configurable)
| Specification | W64 | OPUS |
|---|---|---|
| MIME type | audio/x-w64 | audio/opus |
| Extension | .w64 | .opus |
| Max size | 2^64 bytes | — |
| Relative | RF64 (EBU 64-bit WAV) | — |
| MIME Type | audio/x-w64 | audio/opus |
| Category | Audio Files | Audio Files |
| Full Name | Sony Wave64 | Opus Audio |
| Conversion Engine | FFMPEG | FFMPEG |
| Extensions | — | .opus, .ogg (container) |
| Standard | — | RFC 6716 (2012) |
| Sample rates | — | 8, 12, 16, 24, 48 kHz |
| Latency | — | 5-60 ms (configurable) |
W64 vs OPUS — Strengths and limitations
What each format does best, and where it falls short.
W64 Strengths
- Unlimited file size (64-bit chunks).
- Professional DAW compatibility.
- Bit-exact lossless.
Limitations
- Less universal than WAV.
- Niche — only matters for very large sessions.
- Competes with RF64.
OPUS Strengths
- Best-in-class quality across the entire bitrate range.
- Royalty-free and patent-free.
- Ultra-low latency — suitable for live voice and music.
- Handles speech and music equally well — no need to switch codecs.
- Mandatory codec in WebRTC, so supported in every browser by design.
Limitations
- Very low hardware decoder adoption — software-only on most phones.
- Older platforms (legacy Windows apps, old cars) may not play .opus files.
- Container semantics confusing — Opus lives inside Ogg, WebM, or MP4.
Quality & Compatibility
Lossy-to-lossy transcoding (most cross-format audio jobs) loses a tiny amount of quality on each pass — usually inaudible at our default VBR ~190 kbps for music or 96 kbps for speech. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy is only as good as the target bitrate you choose.
Tips for Best Results
- Pick 128 kbps for podcasts and voice, 192–256 kbps for music, 320 kbps only if the audio will be edited further downstream.
- Keep the W64 master alongside the OPUS — re-encoding a lossy format twice accumulates audible artefacts.
- For mono voice content, convert to mono OPUS explicitly to halve file size without any quality loss.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for OPUS and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the W64 container to the OPUS container automatically where both formats support them. If a tag field has no OPUS equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
Sony Wave64
Source formatWave64 (W64) is an extension of the WAV format developed by Sony that breaks the 4 GB file size limit of standard WAV by using 64-bit chunk sizes. It is used in professional audio production for very long or multi-channel recordings.
Opus Audio
Target formatOpus is a versatile, open-source audio codec optimized for both speech and music at very low bitrates. It is the standard for WebRTC voice calls and excels at real-time communication.
Going the other way? Convert OPUS back to W64 with the same engine.
Common Use Cases
Share across platforms
Send OPUS files to anyone without worrying about whether they have the right software for W64.
Embed in documents
Drop OPUS output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
OPUS often produces smaller files than W64 for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
W64 vs OPUS — Typical file sizes
Approximate file sizes for common scenarios.
- 1-hour 24-bit 48 kHz mono ~620 MB
- 48-hour field recording ~30 GB
- Voice call (24 kbps) 180 KB/min
- Podcast (48 kbps) 21 MB/hour
- Music (128 kbps) ~1 MB/min
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Related comparisons
See these formats side by side to understand which fits your use case best.
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