ZIP Peek
Explore large ZIP archives instantly without extraction. Analyze file lists, sizes, and security risks 100% locally.
Drag ZIP file here or click to upload
Files are never uploaded. All processing happens securely in your browser.
FAQ
Q. How can I preview without extraction?
Our tool reads only the "Central Directory" at the end of the ZIP file, mapping the structure without decompressing the actual data.
Q. Does it protect against ZIP bombs?
Yes. By analyzing file headers first, we flag recursive compression or "decompression ratios" that suggest a ZIP bomb attack.
Q. Can I extract a single file?
Absolutely. You can download specific files from the list without needing to unzip the entire multi-gigabyte archive.
Q. Is password-protected ZIP supported?
Currently, we can list filenames in encrypted ZIPs, but individual extraction requires a password (feature coming soon).
Q. Will you support RAR or 7z?
Yes, we are working on local WASM-based decoders for RAR5 and 7z formats to provide the same no-upload preview experience.
📦 ZIP File Structure
Fast reading logic via Central Directory (EOCD).
- Local File Header
- File Data
- Central Directory
- End of Central Directory Record
Even a 100GB ZIP is analyzed in less than 1 second.
🛡️ Malicious ZIP Identification
Security checkpoints performed before you unzip.
| Risk Factor | Detection Sign | Safety Level |
|---|---|---|
| ZIP Bomb | Extreme compression ratio | Critical |
| Double Extension | .pdf.exe or .jpg.vbs | High |
| Hidden Folders | Leading dots or spaces | Medium |
| Executables | Presence of .exe, .scr, .bat | High |
| Suspect Names | Mimicking system files | Medium |
| Password Protected | Encryption flag enabled | Info |
| Weird Paths | Absolute paths or ../../ | High |
| Timestamp Bugs | Invalid creation dates | Low |
" We flag risks from Green (Safe) to Black (Malicious). "