Convert WAV to JSON Online Free

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Extract a WAV file's technical metadata as structured JSON: codec, sample rate, channels, bit depth, duration, and container details. This is a metadata probe (the same information ffprobe reports), not an audio transcription or a waveform dump.

By ChangeThisFile Team · Last updated: March 2026

Quick Answer

ChangeThisFile converts WAV to JSON online by probing the file and returning its technical metadata — streams and format details such as codec, sample rate, channel count, bit depth, and duration — as pretty-printed JSON. It does not transcribe speech or export audio samples. Free, no signup. Files are encrypted in transit and auto-deleted after conversion.

First daily conversion free No signup required Encrypted transfer · Async jobs kept up to 24h Queued when needed Updated July 2026

WAV Audio vs JSON: Format Comparison

Key differences between the two formats

Feature	WAV	JSON
What it stores	Uncompressed PCM audio samples	Structured text data (keys and values)
Typical use	Recording, editing, audio mastering	APIs, configuration, data exchange
Openable with	Audio players and editors	Any text editor or programming language
File size	Large (uncompressed audio)	Tiny (text metadata only)
This conversion outputs	—	The WAV's technical metadata (streams + format)
Machine readability	Needs an audio library	Directly parseable everywhere

When to Convert

Common scenarios where this conversion is useful

Inspecting audio properties without an editor

See a WAV file's sample rate, bit depth, channel count, codec, and exact duration without opening Audacity or installing ffprobe locally.

Validating uploads in a workflow

Check that recordings meet spec (for example 44.1kHz, 16-bit, stereo) by reading the JSON metadata in a script or QA step.

Cataloging an audio library

Collect duration, format, and bitrate details for a set of WAV files into structured JSON records for a media database or asset manifest.

Debugging playback and compatibility issues

When a WAV won't play somewhere, the JSON reveals the actual codec and container details — which is often the mismatch causing the problem.

Who Uses This Conversion

Tailored guidance for different workflows

Audio engineers and podcasters

Confirming a delivered WAV matches the required sample rate and bit depth
Checking exact durations of takes without loading a DAW

Look at streams[0].sample_rate, channels, and bits_per_sample — those three catch most delivery-spec mismatches.

Developers and QA

Validating user-uploaded audio against format requirements in a build or review step
Generating asset manifests with duration and format for a media pipeline

The JSON shape mirrors ffprobe's -show_format/-show_streams output, so existing ffprobe-parsing code works on it unchanged.

Archivists and librarians

Recording technical metadata for digitized audio collections
Verifying files claimed to be lossless are actually PCM WAV

The codec_name field (for example pcm_s16le) tells you the true encoding regardless of the file extension.

How to Convert WAV Audio to JSON

1

Upload your WAV file

Drag and drop your WAV file onto the converter, or click to select it from your device.
2

Convert

The server probes the file and produces pretty-printed JSON with its stream and format metadata. Files are encrypted in transit and auto-deleted after conversion.
3

Download your JSON

Click download to save the JSON metadata file, ready to read or feed into scripts.

Automate this conversion

Convert WAV Audio to JSON via API

Integrate this conversion into your pipeline with 3 lines of code. Free tier: 25 conversions/month.

curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "file=@input.wav" \
  -F "target=json" \
  -o output.json --fail

const form = new FormData();
form.append('file', fileInput.files[0]);
form.append('target', 'json');

const res = await fetch('https://changethisfile.com/v1/convert', {
  method: 'POST',
  headers: { 'Authorization': 'Bearer YOUR_API_KEY' },
  body: form
});
const blob = await res.blob(); // your converted JSON file

Replace YOUR_API_KEY with your free key — no credit card needed.

Get a free API key

Frequently Asked Questions

What does the JSON output contain?

Two top-level keys: 'streams' (per-stream details such as codec name, sample rate, channels, bit depth, and duration) and 'format' (container-level details such as format name, size, duration, and bitrate). It is the file's technical metadata, the same information a tool like ffprobe reports.

Does this transcribe the audio to text?

No. This conversion extracts technical metadata only — it does not perform speech-to-text or convert audio content into text.

Does the JSON include the audio samples or waveform data?

No. The output describes the file (codec, sample rate, duration, and so on); it does not export the raw sample values.

Is my file uploaded to a server?

Yes, the file is uploaded securely (encrypted in transit) for server-side probing and automatically deleted after conversion.

Is this free?

Yes. Converting WAV to JSON on ChangeThisFile is free and requires no signup.

Why would I want audio metadata as JSON?

JSON is directly readable by every programming language and automation tool, so it's the easiest way to feed audio file properties into scripts, validators, catalogs, or CI checks.

Does it work for other audio and video formats too?

Yes — ChangeThisFile has the same metadata extraction for MP3, MP4, and AVI files, plus full audio conversions if you need to change the format itself.

How accurate is the duration field?

For WAV files the duration is computed from the actual PCM data and sample rate in the file, so it reflects the real length of the recording.

Can I convert the JSON back into a WAV?

No. The JSON describes the file rather than containing its audio, so the conversion is one-way. Keep the original WAV for the audio itself.

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