M4R to VOX Converter

Switch from M4R to VOX format in seconds online

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

M4R into VOX Instantly

Transform any M4R recording into VOX format in seconds. The conversion preserves your audio content faithfully.

Best Possible Output

The conversion engine optimizes encoding parameters to deliver the best quality the target format can hold.

Data Protection

Uploaded files are permanently deleted after conversion. Output audio is automatically removed within 24 hours.

How to convert M4R to VOX

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose vox or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your vox file right afterwards

About formats

M4R is the designated ringtone format for Apple iPhone devices, introduced alongside the original iPhone in 2007. Technically, an M4R file is an AAC-encoded MPEG-4 audio container identical in structure to M4A — the only meaningful differences are the file extension and a duration constraint of roughly 30-40 seconds enforced by iOS. Apple chose this approach so existing AAC encoder infrastructure could produce ringtones without codec-level modifications, while the distinct extension prevents regular music tracks from appearing in the ringtone picker and vice versa. Creating an M4R involves encoding a short audio clip as AAC, trimming it to the allowed length, and renaming the file. iTunes (or Apple Music on recent macOS) and GarageBand both provide built-in workflows, and third-party tools like Audacity handle it equally well. Once synced or downloaded, the ringtone integrates with iOS settings for calls, alarms, and per-contact alerts. Practical advantages include effortless deployment to any iPhone through iTunes sync or AirDrop, high-quality playback from the AAC codec even at small file sizes, and the ability to assign individual ringtones to specific contacts for instant caller identification.
Developer: Apple Inc.
Initial release: June 29, 2007
VOX is a headerless audio format built around Dialogic ADPCM encoding, widely adopted in telephony, interactive voice response (IVR) systems, and voice mail platforms since the 1980s. Each audio sample is compressed into 4 bits using an algorithm developed by Oki Electric and implemented in hardware on Dialogic Corporation's telephony interface cards. VOX files typically use a sampling rate of 6000 or 8000 Hz, producing extremely compact recordings optimized for speech intelligibility rather than musical fidelity. Because the format carries no header, playback software must know the sample rate and encoding parameters in advance — a trade-off that reduces overhead but demands careful file management. The primary advantage of VOX is storage efficiency: a one-minute voice recording at 8 kHz occupies roughly 240 KB, making it practical for systems storing thousands of prompts. Dialogic ADPCM conforms to the ITU-T G.726 standard, ensuring interoperability across telephony equipment from different vendors. Even as modern call centers migrate to IP-based systems with codecs like Opus, vast libraries of VOX recordings persist in legacy IVR deployments and compliance archives worldwide.
Initial release: 1983

Frequently Asked Questions

Why convert M4R to VOX?

VOX Dialogic ADPCM is used in IVR telephony. Convert M4R clips for interactive voice response applications.

What programs can open VOX files?

Telephony systems and IVR platforms handle VOX natively. SoX and Audacity can also play these files.

Is batch M4R to VOX conversion supported?

Absolutely. Upload multiple M4R recordings at once and convert them all to VOX format in parallel.

How long does M4R to VOX conversion take?

Audio conversions typically complete within seconds. Larger files may take a bit longer depending on size and server load.

Are my files safe when converting M4R to VOX?

Completely. Source audio is erased right after processing, and converted VOX files are purged within 24 hours.

Can I convert M4R to VOX on my phone?

Yes — the converter runs in any mobile browser. Works on both iOS and Android without installing an app.