Inspect central directory records, global archive comments, creator OS tags, required decompression versions, and binary flag parameters 100% locally in your browser.
Select or drop any .zip file into the drop zone to initiate local binary header parsing.
Review global archive statistics, central directory offsets, compression methods, and system flags.
Click "Copy Metadata Report" to save the formatted text summary to your clipboard for audit records.
Binary DataView parsing reads the raw file bytes directly in browser memory without sending data across the network.
Locates and decodes Central Directory offsets, total entry counts, and global comments embedded in the archive tail.
Identifies creator operating systems (DOS, Windows, Unix, macOS) and minimum decompression software versions.
Zip Header Attributes & Binary Structure: Every file stored inside a zip archive carries metadata attributes embedded within Local File Headers and Central Directory Records: original file size, compressed size, compression method (DEFLATE / Store), DOS timestamps, and CRC-32 checksums.
Extra Fields, OS Attributes & Forensic Auditing: Extended metadata headers store OS-specific attributes (POSIX permissions, NTFS timestamps, Unicode filename paths 0x7075, and ZIP64 64-bit size extensions 0x0001). Analyzing metadata helps security auditors verify archive origins without decompressing payload files.
100% In-Browser Metadata Extraction: Archive header parsing and metadata display occur 100% locally in web browser RAM via JSZip WebAssembly scripts. Proprietary archives and confidential backup files are never transmitted to cloud servers.