OGA to WMA Converter

Convert OGA to WMA

OGA is Xiph.Org's audio-only Ogg file — an open, royalty-free container that usually holds Vorbis, sometimes Opus or FLAC. WMA is Microsoft's proprietary lossy format, carried in an ASF container, introduced with Windows Media Technologies 4 on 17 August 1999. This conversion exists for one reason: something in your setup — a legacy Windows program, an old in-car head unit, a Windows Media Player library, a corporate playout system — insists on .wma. This page documents both formats precisely, then shows which of the five bitrate controls actually behaves the way its label suggests.

OGA at a Glance

WMA at a Glance

How to Convert OGA to WMA

1. Upload Your OGA File: Drag your .oga onto the page or click "Add Files" to browse. Queue several files and they all run with the same settings.
2. Leave Audio Codec on WMA v2: The page opens on WMA version 2, the more efficient of the two and the bitstream behind Windows Media Audio Standard. Pick WMA v1 only for hardware old enough to predate it.
3. Set Constant Bitrate Under File Compression: Switch File Compression to Constant Bitrate and choose a value between 32 and 320 kbps — 128 to 192 kbps covers CD-quality stereo. Optionally adjust Audio Channel and Audio Sample Rate, or use Trim (its Duration box opens at 10, so an untouched Trim clips the output to ten seconds).
4. Convert and Download: Click Convert and save your .wma, individually or as a ZIP. Files are uploaded over an encrypted connection, converted on our servers, and deleted automatically after a few hours. No sign-up, no watermark.

Setting the Bitrate: What Each Control Really Does

Five entries appear under File Compression, and they are not equally trustworthy on a WMA target. In order of how predictable they are:

• Constant Bitrate — the dropdown of fixed rates. Use this one. The encoder here accepts 32 to 320 kbps, so the 8, 16 and 24 kbps entries in the shared list are below its floor; the WMA encoder rejects a target under 24 kbps outright with "bitrate too low". Start at 32 kbps for the most compressed speech and 128-192 kbps for music.
• Custom Bitrate — the same thing with a free-text box, clamped into the same 32-320 kbps window. Useful when you need a value the dropdown does not list.
• Variable Bitrate — labelled as ranges such as 96k-128k, but WMA as implemented here has no true VBR mode: each range is converted to its average and encoded as a constant rate. Treat "96k-128k" as "about 112 kbps constant", not as a genuine quality-targeted VBR.
• Specific file size — names a byte budget and works backwards to a rate. Handy for fitting a fixed device or disc allocation.
• Quality Preset — the dropdown displays "Highest" when the page loads, but nothing is actually pre-selected; leave it alone and the server falls back to its own middle default rather than the value on screen. The presets scale across the encoder's 32-320 kbps span, so they work, but you cannot read the resulting rate off the label.

One measured caution that applies to all of these: the WMA encoder used here does not track high target rates tightly. Encoding the same pink-noise source at a requested 128 kbps produced a file measuring about 139 kbps, but a requested 192 kbps came out near 277 kbps and a requested 320 kbps near 553 kbps. If file size matters, ask for a lower rate than you think you need and check the result — the overshoot grows sharply above roughly 128 kbps.

Frequently Asked Questions

Will I lose quality converting OGA to WMA?

It depends on what the .oga is carrying. Vorbis, Opus and Speex are all lossy, so re-encoding to WMA is a second generation of compression — the detail the first encoder discarded is gone for good, and the WMA encoder now spends bits describing the first encoder's artifacts. Keeping the WMA rate at or above the source rate limits the added damage. If the OGA holds FLAC, it is a lossless source, and you get a single clean encode exactly as if you had started from a WAV file. Either way, keep the original: lossy encoding is not reversible.

Should I pick WMA v1 or WMA v2?

WMA v2 for almost everyone, and it is what the Audio Codec control opens on. Version 2 is the more efficient encoder and the bitstream behind Windows Media Audio Standard, decoded by any reasonably modern Windows Media stack. WMA v1 is the original 1999 codec; choose it only when you are feeding a device or program old enough to predate v2 support. Both are lossy, and neither is the separate WMA Lossless codec — this page cannot produce that.

What bitrate should I use for WMA?

Microsoft describes the standard Windows Media Audio codec as delivering CD quality between 64 and 192 kbps at 44.1 or 48 kHz in stereo, and that is a sensible frame: 128-192 kbps for music, 64-96 kbps for spoken word, mono for voice. Set it with Constant Bitrate rather than a preset so you know what you asked for, and be aware the encoder tends to exceed the request — verify the finished file's properties if you are working to a size budget.

Why won't my WMA file play on my phone?

Because neither major mobile platform decodes it natively. WMA does not appear in Android's published list of supported media formats, and Apple's iPhone specifications list AAC, Apple Lossless, MP3, FLAC and the Dolby formats with no Windows Media entry. Third-party players such as VLC will open a .wma on either platform, but the built-in music apps generally will not. If you need the audio to play broadly rather than to satisfy one specific Windows tool, OGA to MP3 is the safer target.

Is WMA better than MP3 or AAC?

Not on quality grounds today. Microsoft's original marketing claimed CD-quality audio at half the size of competing formats, but independent listening tests have consistently put modern MP3, AAC, Vorbis and WMA close together at typical bitrates, with no clear WMA advantage. Where WMA definitively loses is reach: MP3 plays on essentially everything, AAC is the Apple and streaming default, and WMA is a Windows story. Convert to .wma only when something specifically requires that extension, and use OGA to AAC or OGA to MP3 otherwise.

Can I get a 5.1 surround WMA out of this?

No. The encoder used on this page handles mono and stereo only, and the Audio Channel control offers Original, Mono and Stereo with no upmixing. Multichannel Windows Media audio is the job of WMA Pro, a different codec that this converter does not write. A stereo .oga will produce a stereo .wma, and a mono source stays mono unless you force Stereo.

What is the difference between a .wma file and an .asf file?

They are the same container with different extensions. ASF — Advanced Systems Format — is Microsoft's container; when it holds only Windows Media Audio the convention is to name it .wma, and when it carries video it is usually .wmv or .asf. That is why some players will happily open a .wma renamed to .asf. The audio bitstream inside is identical either way.

How are my files handled, and how long are they kept?

Your OGA is uploaded over an encrypted connection, converted to WMA on our servers, and both the upload and the finished file are deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public. On a large batch the limiting factor is upload size and time, not a per-file cap. Going the other direction — pulling an existing Windows Media file back into an open format — is handled by WMA to OGA.