Drop any file and reveal its true archive format. Detects ZIP, GZ, TAR, BZ2, XZ, 7Z, RAR by magic bytes — extension-independent. Browser-native, zero upload.
Per-job file size, entry count, and batch caps for Format Detector. Limits apply to every Archive tool in JAD Apps; upgrade for larger uploads and bigger batches.
| Tier | Max archive size | Max entries / archive | Max files per batch |
|---|---|---|---|
| Free | 47.7 MB | 500 | 1 |
| Pro | 476.8 MB | 50,000 | 20 |
| Developer | 1.86 GB | 50,000 | 20 |
Drop any file — extension doesn't matter
We read the first 512 bytes and look up the magic signature
Get a clear identification: format, magic hex, recommended next tool
0 bytes uploaded. Archive Format Detector runs entirely in your browser using fflate, zip.js, and libarchive WASM. Your archive files never leave your device.
ZIP (PK\x03\x04), GZIP (1F 8B), BZ2 (BZh), XZ (FD 37 7A 58 5A 00), 7Z (37 7A BC AF 27 1C), RAR (Rar! 1A 07), and TAR (ustar at offset 257). Detection is byte-exact, not extension-based.
The file is probably renamed or corrupted. A real GZIP starts with 1F 8B at offset 0; if those bytes are missing, the file isn't actually GZIP regardless of name.
No — we read just the first 512 bytes locally via the File API. That's enough for every supported format. Nothing is uploaded.
Inspect every entry's headers — version, OS, last modified, compression method, encryption flags, extra fields. Forensic-grade ZIP intelligence, zero upload.
Open toolExtract ZIP, 7Z, RAR, TAR, TAR.GZ, BZ2, XZ, and ISO files directly in your browser. Powered by fflate and libarchive WASM. Zero upload, instant extraction.
Open toolSee every file inside a ZIP, 7Z, RAR, or TAR before extracting. Tree view, sortable table, byte-accurate sizes — runs entirely in your browser, zero upload.
Open tool