Argon2 KDF Online | Argon2id Encoded Hash Output

Q: Can I choose Argon2i or Argon2d?

No. The generator always uses Argon2id. There is no variant selector, memory setting, or parallelism setting in this form.

Q: Why does the hash change with the same input?

Each request generates a new random salt. Different encoded hashes can therefore verify the same password. The salt entered in the visible field is ignored by this operation.

Q: Can I change the iteration count or output length?

No. Iterations / Work Factor and Key Length (Bytes) are shared interface controls, but this service uses four passes and a 32-byte hash regardless of their displayed values.

Q: How can I check an encoded Argon2 hash?

Use an Argon2 password-verification implementation with the original input and the complete encoded string. Comparing a newly generated string directly will usually fail because the new salt is different.

Q: Is the calculation performed only in my browser?

No. This form sends the entered data to the calculation API. Use sample data instead of production secrets.

This Argon2 KDF form currently generates a salted Argon2id password hash rather than raw derived key bytes. Use it to inspect the encoded hash format or prepare a password-verification fixture. The salt, work-factor, length, and output-format controls do not change the fixed profile used by this operation.

Input Encoding:

Auto / Live

Input text

Salt (Optional / Auto-generated)

Iterations / Work Factor

Key Length (Bytes)

Output Format:

Hex (lower)

Hex (UPPER)

Base64

Argon2 KDF Hash Result

Live

How to use Argon2 KDF

Use the following steps to process a small test input.

Generate an encoded Argon2id hash

Type a non-sensitive test password into Input text. Select UTF-8 under Input Encoding: for ordinary text, or select Hex or Base64 for encoded input bytes.
Salt (Optional / Auto-generated), Iterations / Work Factor, and Key Length (Bytes) are visible, but their submitted values are ignored. Leave these shared fields at their defaults.
Turn Auto / Live off and click Derive Key for one sample. With Auto / Live on, edits request fresh salted hashes.
Read Argon2 KDF Hash Result. Hex (lower), Hex (UPPER), and Base64 do not change this encoded password-hash output.
Click Copy to copy the result. Use Clear where shown, or the field clear controls, to remove the text.

For UTF-8 input password, one verified result is $argon2id$v=19$m=65536,t=4,p=1$QX4WM6TWM8/L8aFWeNE5Dw$s8re0XRXzofpY0eaTtVKAw5MZ6w02Y/EfDamKQUzMm4. A new request uses a new random salt, so its complete result should differ.

A rejected request may leave an earlier result visible. Clear the fields and recheck the input before relying on a new calculation.

Read the Argon2id profile

The encoded string identifies Argon2id version 19 with m=65536,t=4,p=1: 65,536 KiB of memory, four passes, and one lane. It packages a random 16-byte salt and a 32-byte hash. These settings describe this implementation; they are not adjustable through the displayed fields.

Separate password hashes from raw key material

A PHC password-hash string includes algorithm and parameter information. It is not a 32-byte encryption key, even though it contains a 32-byte hash. The current form has no raw-output mode, selectable Argon2 variant, memory control, or parallelism control.

Frequently asked questions

Does Argon2 KDF return a raw encryption key?

The current operation returns an encoded Argon2id password hash. Do not pass the entire PHC string to a cipher as though it were raw key material. This form does not expose raw derivation output.

Can I choose Argon2i or Argon2d?

Why does the hash change with the same input?

Can I change the iteration count or output length?

How can I check an encoded Argon2 hash?

Is the calculation performed only in my browser?

Egor Volchenko Developer & Author

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Argon2 KDF