Password Hash Identifier
Identify hash algorithms online for free with our password hash identifier. Instantly detect bcrypt, Argon2, MD5, SHA-256, SHA-512, NTLM, PBKDF2, scrypt, and 20+ other algorithms from any hash string. Confidence-ranked results with security notes — all analysis runs locally in your browser, no signup required.
Paste any hash string below and click Identify. The tool analyzes the format, length, and prefix patterns to determine the most likely hashing algorithm. All analysis runs locally in your browser — your hash never leaves your device.
Tip: Press Ctrl+Enter to identify
Why Use Our Password Hash Identifier?
Fast, accurate, and comprehensive hash algorithm detection
Instant Hash Algorithm Identification
Our password hash identifier analyzes format, length, prefix, and charset patterns to identify hash algorithms in milliseconds. Identify bcrypt, MD5, SHA-256, Argon2, and 20+ other algorithms instantly.
Secure Password Hash Identifier Online
All hash identification runs entirely in your browser. Your hash strings never leave your device, ensuring complete privacy when you use our password hash identifier online.
Password Hash Identifier — No Installation
Use our password hash identifier directly in any browser with no downloads, plugins, or account required. Identify hash algorithms from any device — desktop, tablet, or mobile — for free.
20+ Algorithms with Confidence Scoring
Our password hash identifier recognizes bcrypt, Argon2, scrypt, PBKDF2, MD5, SHA-1, SHA-256, SHA-512, NTLM, MySQL, Django, PHPass, and more — with High, Medium, and Low confidence ratings for each match.
Common Use Cases for Password Hash Identifier
From security audits to database migrations — hash identification for every need
Security Audits & Penetration Testing
Security professionals use our password hash identifier to quickly determine which hashing algorithm was used in a database dump or leaked credential file. Knowing the algorithm helps assess the security posture and cracking difficulty.
Database Migration & Legacy System Analysis
Developers migrating legacy systems use our password hash identifier to determine what algorithm was used to hash existing passwords. This is essential for planning re-hashing strategies during authentication system upgrades.
CTF Challenges & Security Research
Capture-the-flag participants and security researchers use our password hash identifier to quickly identify hash types in challenge files. Knowing the algorithm is the first step in any hash cracking or analysis workflow.
Incident Response & Forensics
Incident responders use our password hash identifier to analyze credential artifacts found during investigations. Identifying the hash algorithm helps determine exposure risk and prioritize remediation steps.
Authentication System Development
Developers building authentication systems use our password hash identifier to verify that their hashing implementation produces the expected format. Confirm that bcrypt, Argon2, or PBKDF2 outputs match the expected prefix and structure.
Password Policy Compliance Checking
Compliance teams use our password hash identifier to verify that stored passwords use approved modern algorithms (bcrypt, Argon2, scrypt) rather than deprecated ones (MD5, SHA-1, unsalted SHA-256).
Understanding Password Hash Identification
How hash identification works and what each algorithm means for security
What is a Password Hash Identifier?
A password hash identifier is a tool that analyzes a hash string and determines which cryptographic algorithm was used to produce it. Hash algorithms leave distinctive fingerprints — specific prefix patterns (like $2b$ for bcrypt or $argon2id$ for Argon2), output lengths (MD5 = 32 hex chars, SHA-256 = 64 hex chars), and character sets (hex, Base64, Modular Crypt Format). Our password hash identifier uses these patterns to identify 20+ algorithms including bcrypt, Argon2, scrypt, PBKDF2, MD5, SHA-1, SHA-256, SHA-512, NTLM, and more.
How Our Password Hash Identifier Works
- Paste Your Hash: Enter any hash string into the input field. Our password hash identifier accepts hashes in any format — Modular Crypt Format (MCF), hexadecimal, Base64, Base64URL, or raw strings.
- Instant Browser-Based Analysis: Click Identify and the analysis runs entirely in your browser. The tool checks prefix patterns, string length, and character set to match against known algorithm signatures. Your hash never leaves your device.
- Review Confidence-Ranked Results: The password hash identifier displays all matching algorithms ranked by confidence — High (definitive prefix match), Medium (length + charset match), or Low (ambiguous length shared by multiple algorithms).
What the Password Hash Identifier Detects
- Modern Password Hashes: bcrypt ($2a$/$2b$/$2y$), Argon2id/i/d, scrypt, PBKDF2 — the recommended algorithms for password storage with built-in salting and work factors.
- Unix Crypt Formats: SHA-512 Crypt ($6$), SHA-256 Crypt ($5$), MD5 Crypt ($1$), Apache MD5 ($apr1$), PHPass ($P$/$H$), Drupal SHA-512 ($S$) — common in Linux system files and CMS platforms.
- Cryptographic Hash Functions: MD5 (32 hex), SHA-1 (40 hex), SHA-224 (56 hex), SHA-256 (64 hex), SHA-384 (96 hex), SHA-512 (128 hex), RIPEMD-160, BLAKE2, Whirlpool — identified by output length and character set.
- Application-Specific Hashes: MySQL 4.1+ (*hex), Django PBKDF2, Django bcrypt, NTLM (Windows), CRC32 — identified by distinctive format patterns.
Understanding Confidence Levels
High confidence means the hash has a unique, unambiguous prefix or structure that definitively identifies the algorithm — for example, $2b$ can only be bcrypt. Medium confidence means the length and charset match a specific algorithm but could theoretically be another. Low confidence means multiple algorithms share the same output length — for example, SHA-256 and SHA3-256 both produce 64 hex characters and cannot be distinguished by format alone. When multiple matches appear, use additional context (the application that generated the hash) to determine the correct algorithm.
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Frequently Asked Questions About Password Hash Identifier
Common questions about hash identification and algorithm detection
A password hash identifier is a tool that analyzes a hash string and determines which cryptographic algorithm was used to produce it. It works by matching prefix patterns, output lengths, and character sets against known algorithm signatures. Our password hash identifier recognizes 20+ algorithms including bcrypt, Argon2, MD5, SHA-256, NTLM, and more.
The tool analyzes three properties of your hash: the prefix (e.g. $2b$ for bcrypt, $argon2id$ for Argon2), the string length (e.g. 32 hex chars = MD5, 64 hex chars = SHA-256), and the character set (hex, Base64, Modular Crypt Format). These patterns uniquely identify most common hash algorithms. All analysis runs locally in your browser.
Absolutely. All hash identification runs entirely in your browser using JavaScript pattern matching. Your hash string never leaves your device and is never transmitted to any server. You can use our password hash identifier online with complete privacy.
Yes — our password hash identifier is 100% free with no signup, no account, no premium tier, and no usage limits. Identify as many hashes as you need, at no cost.
Some hash algorithms produce outputs of the same length and character set. For example, SHA-256 and SHA3-256 both produce 64 hexadecimal characters and cannot be distinguished by format alone. In these cases, the tool shows all possibilities ranked by confidence. Use the application context (what generated the hash) to determine the correct algorithm.
High confidence means the hash has a unique, unambiguous prefix or structure that definitively identifies the algorithm. For example, $2b$ can only be bcrypt, and $argon2id$ can only be Argon2id. Medium confidence means the length and charset match but could theoretically be another algorithm. Low confidence means multiple algorithms share the same output format.
Yes. Modern password hashing algorithms like bcrypt, Argon2, scrypt, and PBKDF2 embed the salt directly in the hash string using Modular Crypt Format. Our password hash identifier recognizes these formats and extracts metadata like the cost factor from bcrypt hashes.
A cryptographic hash (like SHA-256) is a one-way function that produces a fixed-length output from any input. A password hash is specifically designed for storing passwords — it includes a random salt to prevent rainbow table attacks and a configurable work factor to slow down brute-force attacks. bcrypt, Argon2, and scrypt are password hashes; MD5 and SHA-256 are general-purpose hashes.
The recommended algorithms for password storage are bcrypt, Argon2id (preferred), and scrypt. PBKDF2 is acceptable when the others are unavailable. MD5, SHA-1, SHA-256, and SHA-512 are NOT suitable for password storage without a proper salting and stretching scheme — they are too fast and vulnerable to brute-force attacks.