Type a password and instantly verify whether it unlocks an encrypted ZIP — no full extraction required. Useful for retrieving forgotten passwords from a list.
Per-job file size, entry count, and batch caps for Password Tester. 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 your encrypted ZIP and enter a candidate password
We attempt to decrypt the first encrypted entry's first chunk only
Get a yes/no verdict in milliseconds — no full decryption, no disk write
0 bytes uploaded. Archive Password Tester runs entirely in your browser using fflate, zip.js, and libarchive WASM. Your archive files never leave your device.
No — this tool tests one password at a time at the speed you can type. AES-256 brute-forcing is computationally infeasible regardless. If you've forgotten your password, restore from backup.
Yes — both ZipCrypto and AES-256 are supported. ZipCrypto's known-plaintext attack is a separate concern (see the Encryption Type Detector); this tool just verifies a password you already have.
Decrypting a 5 GB archive to test a password takes minutes. Testing the first chunk of one entry takes milliseconds. Same correctness, 1000x faster.
Detect whether a ZIP uses legacy ZipCrypto, AES-128, AES-192, or AES-256 encryption. Critical before sharing — ZipCrypto is broken and should be re-encrypted.
Open toolBundle files into a ZIP with WinZip-compatible AES-256 encryption. Powered by zip.js — your files and password never leave your device.
Open toolVerify every entry in a ZIP against its stored CRC32 checksum to detect corruption, partial downloads, or tampering. Browser-native, zero upload.
Open tool