OMA to WIM Converter
Processing entirely on your device — large files may take a moment.
Sony OpenMG Audio and Windows Imaging Format exist for different jobs: OMA is Sony's OpenMG audio container — ATRAC-compressed tracks from MiniDisc-era SonicStage libraries (unencrypted files decode fine). Extracting WIM to ZIP exposes the files inside Windows images without deployment tools.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How to convert OMA to WIM
- 1
Select your files
Select your OMA file — it never leaves your device.
- 2
Convert instantly
The engine packs the file, byte for byte, into a WIM container — no re-encoding, no quality change.
- 3
Download results
Download the finished WIM archive.
About the OMA format
WVE is the Psion organiser audio format — 8-bit aLaw samples from early PDAs and handheld voice notes.
ffmpeg decodes it natively inside your browser — the audio track is re-encoded to your chosen format with nothing ever uploaded.
+Strengths
- ✓Decoded natively by ffmpeg
- ✓Runs entirely in your browser
- ✓Free, private, no watermarks
!Limitations
- −Legacy niche format
- −Modern tools rarely open it
- −Keep the original for archival round-trips
About the WIM format
WIM (Windows Imaging Format) is how Microsoft ships Windows itself: the install media and deployment images are WIM files, holding a complete filesystem snapshot with single-instancing (identical files stored once). It is Windows' answer to tar — file-based rather than sector-based.
Opening one without deployment tooling (DISM, 7-Zip on Windows) is awkward. Extracting WIM to ZIP exposes the files inside — drivers, scripts, provisioned apps — on any system, no Windows required.
+Strengths
- ✓Windows' native image format
- ✓Single-instancing deduplicates identical files
!Limitations
- −Opaque without Microsoft tooling
- −Files inside may be Windows-locked
Why convert OMA to WIM?
There is a concrete reason this conversion exists: Legacy niche format WIM sidesteps that — Windows' native image format If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this OMA to WIM converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for OMA to WIM?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Can I convert a whole folder of OMA files?
You can select many files at once and they are processed in a single batch. Output files land in one ZIP download when there is more than one result.
Will converting OMA to WIM reduce audio quality?
If WIM is lossless, the output contains everything the OMA file contains — no further loss is added. If WIM is lossy, one recompression pass is unavoidable; the quality slider controls how much. Loss that already happened in the source file can never be undone by converting.