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Drop your audio file here
or click to browse — we'll analyze every byte
FLAC WAV AIFF ALAC MP3 AAC OGG M4A OPUS
— files analyzed globally
Decoding audio data…
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File Information
Drop an audio file above to see its name, size, duration, and overall bitrate. Higher bitrate generally means more data retained per second of audio.
Audio Format
Shows the codec, container, sample rate, and bit depth of your file. A lossless codec (FLAC, WAV, ALAC) preserves every sample exactly. A lossy codec (MP3, AAC, Vorbis) permanently discards some data to save space.
Spectrogram Analysis  Example
0s —
Frequency Spectrum (Avg)
Example — Upsampled File (96 kHz claimed)
20 Hz 5 kHz 10 kHz 16 kHz ✂ 48 kHz
⚠ Content stops abruptly at ~16 kHz — classic upsampling signature
Frequency Cutoff Detection
Example — Upsampled File (96 kHz claimed)
Detected Cutoff 16.2 kHz
Nyquist Frequency 48.0 kHz
Bandwidth Usage 33.8%
22.05 kHz (CD)
⚠ Only 33.8% of available bandwidth contains real audio — upsampled source
Dynamic Range
Dynamic range is the gap between the quietest and loudest moments. A high crest factor (14+ dB) means the audio breathes naturally. A low value signals heavy compression — the "loudness war" effect that makes music feel flat and fatiguing.
Level Analysis
Peak level is the loudest single sample (ideally below −1 dBFS). RMS level reflects perceived average loudness. If the peak is at 0 dBFS, clipping may have occurred, introducing audible distortion.
Stereo Analysis
Stereo correlation measures how similar the left and right channels are. A value near 1.0 means near-mono. Genuine stereo recordings sit around 0.3–0.8. Negative values indicate out-of-phase audio, which can cause issues on mono speakers.
Quality Assessment
After analysis, SoniqTools checks each quality dimension — lossless vs lossy format, sample rate, bit depth, upsampling detection, clipping, and dynamic range — and gives a pass, info, warning, or fail verdict for each.

About SoniqTools

SoniqTools is a free browser-based audio analyzer that helps you verify the true quality of your audio files. Detect upsampled FLAC files, check bit depth and sample rate, measure dynamic range, and analyze frequency spectrum — all without uploading your files. It works entirely in your browser, so your music never leaves your device.
Drop any audio file into SoniqTools to get an instant quality report. The tool uses FFT-based spectral analysis to detect upsampling, identify frequency cutoffs, measure dynamic range, and verify whether your hi-res audio is genuine. All processing happens locally in your browser using the Web Audio API — no files are ever uploaded to a server, and no account is needed.
SoniqTools supports all major audio formats your browser can decode: FLAC, WAV, AIFF, ALAC, MP3, AAC, OGG, M4A, and OPUS. Both lossless and lossy files are fully analyzed — it's a general-purpose audio analyzer that also helps you verify hi-res audio files.
  • Upsampling detection — identifies fake hi-res audio files that were upsampled from lower-resolution sources
  • Frequency spectrum analysis — visualizes energy distribution from 20 Hz to the Nyquist frequency
  • Spectrogram visualization — shows how frequency content changes over time across the full track
  • Dynamic range and loudness — measures crest factor, peak level, and RMS to assess loudness and compression
  • Format detection — identifies codec, container, sample rate, bit depth, and bitrate
  • Quality assessment — provides pass, info, warning, or fail verdicts for each dimension of your audio
Yes — SoniqTools works like Spek but runs entirely in your browser with no download or installation needed. Like Spek, it generates spectrograms and helps you spot fake lossless files. SoniqTools goes further by also measuring dynamic range, detecting clipping, analyzing stereo correlation, and providing automated quality verdicts.