windows app

Convert MP3 to M4A

Convert MP3 audio files to M4A audio files locally on Windows. No upload, no signup, no watermark.

offlinewindows 10 & 11free

Get it onMicrosoft Store

mp3m4a

features

what the app does

Paste from clipboard — Ctrl+V joins the queue (e.g. a Win+Shift+S screenshot lands without saving to disk).
Batch convert whole folders, sub-folder structure preserved.
Auto-convert watcher — point the app at a watched folder; converted files appear in your output folder.
Right-click .mp3 files in File Explorer — "Convert to M4A" opens the app pre-loaded with your selection.
Ten UI languages, light + dark themes following the system.
Offline by design — no telemetry, no account, no user-data exfiltration.

details

MP3 to M4A on your pc

Convert mp3 to m4a on Windows with a local tool made for quick, private audio file conversion.

how it works

This mp3 to m4a converter uses ffmpeg.wasm and runs on your Windows PC. Your audio files stay on your device while the app turns them into M4A audio files.

paste from clipboard

Press Ctrl+V to drop an audio file from the clipboard straight into the queue. For example, copy an audio file in File Explorer and paste it here to start converting right away.

batch conversion

Process whole folders of audio files in one run. The output keeps the same folder structure, so subfolders stay organized on the other side.

auto-convert watcher

Use the Auto-convert page to set a watched folder and an output folder. The app stays in the Windows system tray and keeps converting audio files in the background.

right-click in explorer

A native shell extension adds Convert to M4A to the right-click menu for .mp3 files in File Explorer. The app opens with your selection already loaded.

languages & themes

The app ships in ten languages. Light and dark themes follow the Windows system theme automatically.

offline by design

No telemetry, no account, and no file uploads. Your audio files never leave the device.

free & pro

The free version lets you convert MP3 to M4A with no file size or file count limits. Upgrade to Pro with a one-time lifetime purchase to remove ads and unlock batch conversion. No subscriptions or recurring payments.