OMA to 7Z Converter
Processing entirely on your device — large files may take a moment.
OMA is Sony's OpenMG audio container — ATRAC-compressed tracks from MiniDisc-era SonicStage libraries (unencrypted files decode fine). 7Z is ideal for big archives you store or share with power users; convert to ZIP when the recipient just needs to double-click.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How to convert OMA to 7Z
- 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 7Z container — no re-encoding, no quality change.
- 3
Download results
Download the finished 7Z 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 7Z format
7Z is the native format of Igor Pavlov's 7-Zip (1999), built around LZMA/LZMA2 compression — for years the ratio king against ZIP and RAR — with AES-256 encryption, solid archiving (similar files compress as one stream) and open, unpatented specifications. A 7Z of the same photos or code is routinely 20–40% smaller than its ZIP.
The trade-off is platform defaults: Windows Explorer and macOS Archive Utility do not open 7Z without third-party tools (7-Zip, PeaZip, Keka). It is the format for maximizing compression on your own terms, and for encrypted archives done properly (header encryption included).
+Strengths
- ✓Top-tier compression ratio (LZMA2)
- ✓Real AES-256 encryption, optional header encryption
- ✓Open format, free tooling everywhere
!Limitations
- −No native OS support — recipients need tools
- −Solid mode makes single-file extraction costly
Why convert OMA to 7Z?
Converting makes sense where the strengths of 7Z meet what OMA cannot give you. Top-tier compression ratio (LZMA2) Meanwhile Legacy niche format One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this OMA to 7Z 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 7Z?
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.
Are tags like title and artist preserved?
Tag handling varies between target formats and this conversion focuses on the audio itself. For archival copies where tags matter, keep the original file; the converted copy is for playback and sharing.
Will converting OMA to 7Z reduce audio quality?
If 7Z is lossless, the output contains everything the OMA file contains — no further loss is added. If 7Z 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.