FLAC Validator
Drop any .flac file to instantly check its structure. Verifies the FLAC stream marker, parses all metadata blocks (STREAMINFO, VORBIS_COMMENT, SEEKTABLE, PICTURE, and more), reports sample rate, bit depth, channels, and duration. Nothing leaves your browser.
FLAC File
Drop a .flac file here, or
Supports .flac files up to 200 MB
⛔
Wrong file type — only .flac files are supported. You dropped a file.
Validation Errors
Warnings
✓ Valid FLAC
Vorbis Comment Metadata
How It Works
1
Drop your FLAC fileDrag it onto the drop zone or click "browse" to select it from your device.
2
Metadata block analysisThe validator checks the
fLaC stream marker, then walks every metadata block — reading STREAMINFO for technical specs and VORBIS_COMMENT for embedded tags.3
Review the reportGet a pass/fail result plus full stats: sample rate, bit depth, channels, total samples, duration, metadata blocks found, and all Vorbis comment tags.
What Gets Validated
- FLAC stream marker — the first 4 bytes must be
fLaC(0x66 0x4C 0x61 0x43). Any other value means this is not a FLAC file. - STREAMINFO block — the mandatory first metadata block. Contains minimum/maximum block size and frame size, sample rate, number of channels, bits per sample, total samples, and MD5 signature.
- Sample rate — extracted from STREAMINFO; valid FLAC sample rates range from 1 Hz to 655,350 Hz.
- Bit depth — FLAC supports 4 to 32 bits per sample. Common values are 16-bit (CD quality) and 24-bit (hi-res).
- Channel count — FLAC supports 1–8 channels. Values are decoded as Mono, Stereo, or multi-channel.
- Metadata block chain — all metadata blocks are enumerated (PADDING, APPLICATION, SEEKTABLE, VORBIS_COMMENT, CUESHEET, PICTURE) and counted.
- Vorbis comments — checks for the VORBIS_COMMENT block and reads standard tags: TITLE, ARTIST, ALBUM, TRACKNUMBER, DATE, GENRE, COMMENT, and more.
- MD5 signature — reports whether a non-zero MD5 checksum is present in STREAMINFO (used by decoders to verify stream integrity).
🔒 Privacy & Security
All validation is performed locally using the Web File API and JavaScript ArrayBuffer. Your audio file is never sent to a server. Suitable for private recordings, unreleased masters, or any sensitive audio content.
Related Guides & Tutorials
Guide
The Complete Guide to Flac Validating: Everything You Need to Know
What the validator checks, how to interpret results, and best practices for FLAC file integrity.
TutorialHow to Use the Flac Validator: Step-by-Step Tutorial
A practical walkthrough of validating FLAC files in your browser with real examples.