Turn WAV, M4A, FLAC and OGG into MP3, compress big files, and cut clips down to size — no upload, no watermark, no signup.
Drop your audio file here
or click to browse · nothing leaves your browser
Everything you can do
Audio, converted locally
WAV, M4A, FLAC, OGG and more — convert, compress, and trim right in your browser. Your recordings never leave your device.
GhostAudio converts and edits audio entirely in your browser — no upload, no signup, no file limit. Convert WAV, M4A, FLAC, OGG, AAC, Opus, AIFF, WMA and AMR to MP3, compress a track to a smaller size, and trim to just the part you need. All of it runs on ffmpeg compiled to WebAssembly, so your recordings — voice memos, interviews, music — are processed on your device and never sent to a server.
Drop your audio file
Add a WAV, M4A, FLAC, OGG or other audio file. It loads into your browser.
Convert, compress, or trim
Convert to MP3, shrink the bitrate to save space, or trim to a start and end point.
Download the MP3
Save the finished audio directly from your browser.
| Feature | GhostX | Online-Audio-Converter / CloudConvert |
|---|---|---|
| Audio uploaded to a server | Never — on-device | Uploaded and queued |
| File / conversion cap | Unlimited | Free tier is limited |
| Signup | No | Often required |
| Privacy of recordings | Never leave your device | Held on their servers |
How do I convert WAV to MP3 without uploading it?
Drop the WAV file and choose Convert → MP3. The conversion runs on ffmpeg in your browser (WebAssembly), so the audio is never uploaded.
Can I convert an iPhone M4A voice memo to MP3?
Yes. Add the .m4a file and convert to MP3 locally — ideal for sharing a voice memo with someone who can't open M4A.
How do I make an MP3 file smaller?
Use the Compress operation to lower the bitrate. A voice recording can drop to a fraction of its size with no noticeable loss for speech.
Can I trim audio to just a clip?
Yes. Set a start and end time with the Trim operation and export only that section.
Is there a size limit on the audio file?
No server cap — the limit is your device's memory. Long interviews and full albums convert fine on a modern machine.
Everything runs in your browser. Your files are never uploaded — for the single-file tools there's no upload endpoint to send them to.
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