Convert WAV to JSON Online Free
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Converts to JSON on secure servers · 1 free a day, files up to 25 MB · no signup
Your first conversion each day is free (files up to 25 MB). A $2.99 one-time Day Pass unlocks 24 hours and ends by itself.
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: October 2026
ChangeThisFile turns a WAV file into a JSON description of it: codec, sample rate, channels, bit depth, and duration, plus container details. It runs ffprobe on our server and returns ffprobe's own JSON. It does not transcribe speech or export audio samples. Your first conversion each day is free for files up to 25MB; a $2.99 Day Pass covers more conversions and files up to 100MB.
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
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
Archivists and librarians
- Recording technical metadata for digitized audio collections
- Verifying files claimed to be lossless are actually PCM WAV
How to Convert WAV Audio to JSON
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1
Upload your WAV file
Drag and drop your WAV file onto the converter, or click to select it from your device.
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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.
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3
Download your JSON
Click download to save the JSON metadata file, ready to read or feed into scripts.
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
YOUR_API_KEY with your free key — no credit card needed.
Frequently Asked Questions
A 2-second test WAV returned a stream with "codec_name": "pcm_s16le", "sample_rate": "44100", "channels": 1, "bits_per_sample": 16 and "duration": "2.000000", plus a "format" block with the container name, size and bitrate.
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.
No. This conversion extracts technical metadata only — it does not perform speech-to-text or convert audio content into text.
No. The output describes the file (codec, sample rate, duration, and so on); it does not export the raw sample values.
Yes. The file is uploaded over an encrypted connection for server-side probing. Files up to 15MB are deleted as soon as the converted file is sent back; larger files run as a background job and are deleted automatically about a day later.
Your first conversion each day is free, with no signup and no watermark, for files up to 25MB. For more conversions the same day or files up to 100MB, a one-time $2.99 Day Pass unlocks unlimited conversions for 24 hours. No account or subscription is needed.
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.
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.
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.
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.
Free conversions accept files up to 25MB. A one-time $2.99 Day Pass raises the limit to 100MB and unlocks unlimited conversions for 24 hours. WAV is uncompressed, so long recordings get large quickly; ffprobe -v quiet -print_format json -show_format -show_streams recording.wav gives the same JSON locally.
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