ASF to OGA Converter
Initializing... drag & drop files here
Supports: ASF
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
Reset to defaults
Need help?ASF to OGA Converter
ASF (Advanced Systems Format) is Microsoft's container, usually carrying WMV video and WMA audio. OGA is the Ogg audio container — on this tool it holds Vorbis, the open, royalty-free codec from the Xiph.Org Foundation. This is an audio-extraction job: it pulls the soundtrack out of the ASF, discards any video, and re-encodes it to Ogg/Vorbis. Because WMA inside ASF is already lossy, this is a lossy-to-lossy re-encode — it cannot restore quality the source never had, but Vorbis is efficient enough to stay close to transparent at sensible bitrates.
ASF Format at a Glance
| Property | Value |
|---|---|
| Full name | Advanced Systems Format (formerly Active Streaming Format) |
| Released | 1996, Microsoft |
| Typical payload | WMV video + WMA audio |
| Audio codec | WMA (WMAV2) — lossy |
| Container role | Streaming wrapper with optional DRM, error correction, indexing |
| Best for | Legacy Windows media, older WMV/WMA archives |
| Native browser support | None (no <audio>/<video> playback in any browser) |
OGA (Ogg/Vorbis) Format at a Glance
| Property | Value |
|---|---|
| Container | Ogg, maintained by Xiph.Org |
| Codec on this tool | Vorbis — lossy, MDCT-based |
| Extension meaning | Per RFC 5334, .oga is the audio extension for the Ogg container; .ogg is reserved for Vorbis-only files |
| Sample rates | 8 kHz to 192 kHz |
| Channels | 1 to 255 (mono, stereo, multichannel) |
| Licensing | Patent-free, no royalties |
| Native browser support | Chrome 4+, Firefox 3.5+, Edge 17+, Safari 18.4+ (partial 14.1–18.3) — about 95% of users (caniuse) |
| Best for | Web audio, open-source players, game sound where licensing matters |
How to Convert ASF to OGA
- Upload Your ASF File: Drag and drop your
.asffile onto the page or click "+ Add Files." You can queue several files to convert with the same settings. - Set the Audio Codec and Quality Preset: OGA defaults to the Vorbis codec. Open "Show All Options" and pick a Quality Preset (Highest down to Lowest) — Very High keeps near-transparent audio at a small size.
- Refine Bitrate, Sample Rate, or Trim (Optional): Use Variable Bitrate or Custom Bitrate to target an exact rate, adjust Audio Sample Rate, or set Trim Start time and Duration to export just a clip.
- Convert and Download: Click "Convert" and save your OGA file. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. No sign-up, no watermark.
Frequently Asked Questions
Is the output OGA file video or audio only?
Audio only. ASF can hold both a WMV video track and a WMA audio track, but this converter extracts the audio stream and discards the video. The result is a pure Ogg/Vorbis audio file — there is no picture in an OGA. If you need to keep the video, convert ASF to a video format like MP4 instead.
Will converting WMA inside ASF to Vorbis improve the sound quality?
No. The WMA audio in an ASF file is already lossy, and re-encoding it to Vorbis (also lossy) cannot recover detail that was discarded the first time. A re-encode is best used to change container or shrink size, not to upgrade fidelity. To keep what you have, choose a Quality Preset of Very High or Highest, or set a Variable Bitrate around 192k so the second encode adds as little loss as possible.
What is the difference between an OGA and an OGG file?
Both use the Ogg container, so the bytes inside are closely related. The naming is a convention from RFC 5334: .oga is the general extension for Ogg audio, while .ogg became reserved for files that contain only a Vorbis bitstream. In practice many players treat the two interchangeably. This tool outputs Vorbis audio with the .oga extension; if you specifically need the .ogg name, use our ASF to OGG converter instead.
What can open and play an OGA file?
VLC media player plays OGA on Windows, macOS, and Linux without extra setup, and most open-source players handle it natively. In the browser, Ogg/Vorbis plays in Chrome, Firefox, and Edge, and in Safari 18.4 and later. Windows Media Player needs a DirectShow filter to open Ogg files, so for Windows-first sharing MP3 is the safer choice.
Should I convert ASF to OGA or to MP3 instead?
Pick OGA/Vorbis when licensing matters, when you are publishing web or game audio, or when your players are open-source — Vorbis is patent-free and efficient at low bitrates. Pick MP3 when you need the broadest device and app compatibility, including older hardware and Apple desktop software, where MP3 is universally supported. If compatibility is the priority, use our ASF to MP3 converter.
Can I trim the audio or set an exact file size during conversion?
Yes. Under "Show All Options" the Trim controls let you set a Start time and Duration to export only part of the track. For size, the "Specific file size" option targets an exact output, while Variable Bitrate and Custom Bitrate let you dial the rate directly. In our testing, a five-minute ASF soundtrack exported to Vorbis at a 192k variable bitrate lands near 7 MB while staying close to transparent.
Are my uploaded ASF files kept private?
Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up and no watermark, and your files are never shared or made public. To compress audio after extraction, you can also use the Audio Compressor.