Argon2 Hash Identifier
Detect Argon2 password hashes cleanly and inspect the PHC string metadata that makes the format so useful for audits.
Single or batch analysis
Identify likely hash formats, risk level, and structured metadata
Paste one value or multiple lines. The analyzer checks length, character set, modular prefixes, and common password-hash signatures, then shows likely candidates with honest ambiguity handling.
Entries
1
Selected type
bcrypt
Confidence
High
Risk
Modern
Charset
Structured / modular
Unique likely types
1
Candidates
Likely hash types and why they matched
Starts with $2b$ and matches bcrypt's fixed modular-crypt shape.
Structured details
Parsed metadata when the format exposes it
Version
2b
Cost
12
Payload length
53
Notes
Context and caveats
- bcrypt is adaptive and salted, which makes it much more suitable for password storage than fast digests like MD5 or SHA-1.
Other hash identifier pages
Why use this hash identifier page?
An Argon2 hash identifier is especially useful because Argon2 is one of the clearest examples of a modern password-hash format that exposes meaningful configuration directly in the stored string. When you encounter an Argon2 PHC string, you are not just looking at a blob of output. You are looking at a structured record that can tell you the variant, version, memory cost, iteration count, and parallelism. That makes a specialized Argon2 page genuinely useful for audits and migrations.
Benefits of this workflow
Use an Argon2-specific page when you want a higher-signal answer than "this might be a password hash." In practice, Argon2 often appears in modern auth systems, security-conscious products, and newer framework defaults. The most useful thing is not only detecting that it is Argon2, but also reading the parameters correctly. That helps you understand whether the deployment is using Argon2id, whether the configured memory is sensible, and whether the stored value looks like a modern PHC string rather than an opaque unknown format.
- Detects Argon2 formats with high confidence.
- Parses PHC metadata such as memory, iterations, and parallelism.
- Useful for password-storage reviews and migration work.
- Helps separate modern password-hash design from generic digest guessing.
How to use the tool well
Paste the candidate hash and look at the candidate list first. If the string matches the PHC layout with a prefix like $argon2id$, $argon2i$, or $argon2d$, the analyzer should identify it with high confidence. Then inspect the structured details for version, memory, iterations, and parallelism. Those parameters are often the most valuable part of the result because they turn a simple identifier into a practical audit tool. The notes explain why that matters for real password-hash quality reviews.
Best practices
- Review Argon2 parameters as part of the audit instead of stopping at the algorithm name.
- Prefer Argon2id when modern password-storage guidance points in that direction.
- Use PHC-format parsing to keep password-hash reviews precise and repeatable.
- Treat structured password hashes differently from raw digests during investigations.
Frequently asked questions
What makes Argon2 easier to analyze than plain digests?
Its PHC string format exposes meaningful metadata directly in the stored value, including variant, memory, iteration, and parallelism settings.
Why does Argon2id matter specifically?
Argon2id is commonly recommended because it balances properties from Argon2i and Argon2d and is widely viewed as a strong practical choice for password hashing.