FLAC to PVF Converter

Create Portable Voice Format from lossless FLAC

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

Linux Voice Gateway

PVF is the standard for Linux fax/voicemail — produce clean voice files from lossless FLAC sources.

Lossless Input

FLAC provides pristine source audio — the PVF encoder receives the best possible input.

Server Processing

No Linux tools needed locally — convert FLAC to PVF in your browser.

How to convert FLAC to PVF

1

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

2

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

3

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

About formats

FLAC (Free Lossless Audio Codec) delivers mathematically perfect audio reproduction at roughly half the size of an uncompressed WAV file. Maintained by the Xiph.Org Foundation and released in 2001, it quickly became the de facto open standard for lossless music archival. The encoder applies linear prediction to model each audio block, then codes the residual through Rice partitioning — exploiting the statistical distribution of prediction errors for strong compression without discarding data. Bit depths up to 32 and sample rates up to 655 kHz are supported, exceeding the requirements of high-resolution recordings. Hardware support is extensive: smartphones, car stereos, Blu-ray players, and virtually every desktop media application decode FLAC natively. Streaming services such as Tidal and Amazon Music use FLAC for lossless tiers, underscoring industry trust in the codec. Three standout benefits make FLAC compelling. First, complete bit-for-bit restoration of the original signal upon decoding. Second, embedded metadata via Vorbis comments and album art keeps libraries organized without sidecar files. Third, open-source licensing means no patents or royalties, removing legal friction for developers and hardware vendors.
Initial release: July 20, 2001
PVF (Portable Voice Format) is a simple audio file format designed for voice message storage in Linux-based telephony systems, most notably ISDN4Linux and its vbox voicemail application. The format emerged from the European ISDN ecosystem of the late 1990s, when Linux servers increasingly handled PBX and answering machine duties over digital phone lines. PVF files store raw signed 16-bit PCM samples at 8000 Hz mono, preceded by a minimal plain-text header specifying data format and byte ordering. This deliberate simplicity is one of the format's primary strengths — with no compression and a human-readable header, PVF files are trivially easy to parse, pipe, and manipulate using standard Unix tools. The 8 kHz rate matches the Nyquist requirement for telephone-bandwidth speech (300-3400 Hz), making PVF a natural intermediate format for voice processing pipelines. Another advantage is cross-architecture portability: the explicit byte-order declaration means PVF files move between big-endian and little-endian systems without ambiguity. The SoX audio toolkit provides native PVF read/write support, enabling straightforward conversion to modern formats.
Developer: ISDN4Linux Project
Initial release: 1997

Frequently Asked Questions

Why convert FLAC to PVF?

PVF is used in Linux fax and voice mail gateways. Starting from lossless FLAC ensures the best voice quality for PVF encoding.

What reads PVF?

SoX, mgetty+sendfax, vgetty, and Linux voice/fax gateways process PVF files natively.

Is PVF for voice only?

Yes — PVF is designed for voice data in telephony systems, not music or general audio.

Why use FLAC instead of MP3?

FLAC preserves every detail of the source recording, giving PVF the cleanest input for voice encoding.

Can I batch convert?

Upload multiple FLAC voice recordings and produce PVF for each simultaneously.