Archive knowledge base

ZIP, RAR, and 7z password recovery guides

Find the guide that matches the format, error, or password clue in front of you. Each page explains what the evidence means, what to test next, and where the limits are.

Error and situation guides

Decision trees for the messages and edge cases that cause the most confusion.

Forgot Your ZIP Password?

Forgot your ZIP password? Follow a practical checklist for backups, password clues, ZipCrypto versus AES, integrity checks, and professional recovery.

FORGOT PASSWORD

How to Open a Password-Protected ZIP File

Learn how to open a password-protected ZIP on Windows, macOS, and Linux, and what to do when the password is forgotten or extraction fails.

OPEN A ZIP

Recover a ZIP Password When You Remember Part of It

Remember part of a ZIP password? Turn a known prefix, suffix, length, or character pattern into a bounded recovery plan for your own archive.

PASSWORD CLUES

7z Encrypted Headers: Why You Cannot See the File List

7-Zip encrypted headers hide filenames and archive metadata. Learn how to identify the condition, avoid corruption mistakes, and plan recovery.

7z HEADERS

7z Cannot Open the File as an Archive

Getting 'Can not open the file as archive' in 7-Zip? Check truncation, wrong extension, split volumes, encrypted headers, and password errors in order.

7z ERROR

7z Data Error After Entering a Password

A 7z data error after entering a password can mean failed authentication, damaged encrypted data, or a missing volume. Use this diagnostic checklist.

7z DIAGNOSTIC

RAR Checksum Error: Password or Corruption?

RAR checksum errors have several causes. Learn how to check the password, archive integrity, recovery record, and complete volume set in the right order.

RAR DIAGNOSTIC

Split RAR Password Recovery

Recovering a split RAR password starts with a complete volume set. Learn the .part and .r00 naming patterns, solid archives, and safe verification steps.

SPLIT RAR

SFX ZIP Password Recovery

A self-extracting ZIP is an executable wrapper around archive data. Learn how to identify SFX files safely, extract the payload, and handle a forgotten password.

SFX ARCHIVE

Known-Plaintext Recovery for ZipCrypto ZIP Files

A matching unencrypted file can help recover a ZipCrypto archive without a broad password search. Learn the requirements, limits, and verification steps.

KNOWN PLAINTEXT

Technical and buying guides

Format details, verification tools, integrity checks, and service decisions.

ZipCrypto vs WinZip AES

ZipCrypto and WinZip AES protect ZIP files in very different ways. Compare visibility, recovery paths, authentication, and practical diagnostics.

ZIP ENCRYPTION

RAR3 vs RAR4 vs RAR5 Encryption

RAR3, RAR4, and RAR5 are not interchangeable. Learn how generation, AES settings, encrypted headers, and archive structure affect password recovery.

RAR FORMATS

WinRAR vs 7-Zip Encryption

Compare WinRAR RAR5 and 7-Zip 7z encryption by headers, key derivation, archive structure, diagnostics, and password recovery planning.

RAR5 vs 7z

Archive Verification Data: ZIP, RAR, and 7z

Learn what ZIP, RAR, and 7z verification data is used for in password recovery, how to preserve privacy, and why a hash is not the password.

TECHNICAL GUIDE

Archive Corruption vs Encryption

Is your archive password-protected or damaged? Compare ZIP, RAR, and 7z error patterns, missing volumes, and integrity checks before recovery.

DIAGNOSTICS

Free vs Professional Archive Password Recovery

Compare local archive password recovery with a professional service by privacy, setup, cost, evidence, and realistic success conditions.

DECISION GUIDE

How Long Does ZIP Password Recovery Take?

ZIP password recovery time depends on encryption, candidate count, hardware, and archive health. Learn how to make a realistic estimate without fake guarantees.

TIME ESTIMATE

How Much Does Archive Password Recovery Cost?

Understand ZIP, RAR, and 7z password recovery costs: hardware, electricity, setup time, diagnostics, service fees, privacy, and no-result risk.

COST GUIDE

Archive Password Recovery Tools

Compare local archive analyzers, candidate verifiers, known-plaintext tools, and professional recovery services without unsupported success claims.

TOOLS

ZIP File Header Analysis

Use ZIP header metadata to distinguish ZipCrypto, WinZip AES, unencrypted entries, and damaged containers before password recovery.

ZIP HEADERS

PKZIP and Legacy WinZip Password Recovery

Old PKZIP and WinZip archives often use ZipCrypto. Learn how to identify legacy entries, search for matching files, and verify recovery safely.

LEGACY ARCHIVES

RAR5 Encryption and Password Recovery

A practical technical guide to RAR5 encryption, encrypted headers, key derivation, authentication, and what the design means for password recovery.

RAR5 TECHNICAL

7z AES-256 Key Derivation

Understand 7z AES-256 password derivation, encoded parameters, encrypted headers, and why responsible recovery estimates must use the actual archive.

7z TECHNICAL

Evidence before recovery

Every guide assumes owner-authorized use, a preserved original, and a verified extraction result. We do not promise that a strong random password can be recovered.

Read our methodology