What Zlib Header Inspector does
Validate RFC 1950 CMF/FLG fields, FCHECK, window size, compression-level hint, and optional dictionary ID.
Input and output contract
Only the first 4 KiB is read. A structured JSON-like header report.
Important limitations
It does not decompress DEFLATE data or validate the trailing Adler-32.
Safety
This Phase 44 Tool runs locally in the browser with explicit input bounds. It does not infer game compatibility or repair unsupported formats.