📖 Tool Introduction

Audio Info is a completely free tool that runs entirely in your browser and reveals the technical specifications of any sound file. It goes far beyond ordinary file properties: a generic file manager only tells you the size and the name, whereas this tool hands the audio to the browser's built-in Web Audio decoder, decodes it fully, and then reports the metrics that actually matter — total duration, sample rate, number of channels, and total sample frames — before estimating the overall bitrate from the file size and judging, by channel count, whether the recording is mono, stereo or multi-channel surround. Those figures are exactly what you check before using a clip for voice-over, importing it into a professional editor, or deciding whether it meets a quality standard. The interface pairs a gradient title band at the top with four large-numbered stat cards in the middle and a compact detail list below, so the information hierarchy is clean and effortless to scan. Nothing about this decoding step touches the network; the audio bytes never leave the browser, which makes the tool safe to use on machines without internet access and in sensitive environments. It accepts common formats such as MP3, WAV, OGG, FLAC and M4A (ultimately limited by the browser decoder), adapts automatically to Simplified Chinese, Traditional Chinese and English, and opens on both desktop and mobile browsers without requiring any plugin or installation. Whether you are a podcaster cleaning up source material, an editor checking delivery specs, or a curious listener wondering why one song sounds different from another, this tool gives you the numbers in seconds.

✨ Key Features

• Real decoding: instead of guessing from headers, it reads the true sample rate and channels after full decode
• Big-number cards: duration, sample rate, channel count and size are visible at a single glance
• Detail list: file name, format, sample frames, channel layout and estimated bitrate, item by item
• Bitrate estimate: overall bitrate derived from size and duration to judge how compressed the file is
• One-click copy: the core metrics are formatted as plain text for tickets and asset sheets
• Private by design: decoding stays inside the browser, with zero uploads and zero leaks

📝 How to Use

1. Click the dashed area to choose a local audio file, or drop it straight onto the page
2. Wait for the browser to finish decoding; the four stat cards light up with values
3. Read sample frames, channel layout and estimated bitrate in the detail list below
4. Click Copy info to store the result on the clipboard for your records
5. Click Example to load an automatically generated sine-wave WAV and see the flow

⚠️ Notes

• Decoding support: opening a file depends on the browser decoder, and a few container formats may not parse
• Sample rate basis: the displayed rate is the actual decoder output, which may differ after resampling
• Bitrate estimate: the overall bitrate is derived from size divided by duration, not a per-stream figure
• Size limit: keep a single file under about 100MB; larger files consume more memory and time
• Sample audio: the example is a locally synthesized 440Hz sine wave for demonstration only