How the Database Password Compatibility Tool works
The Database Password Compatibility Tool is designed around one inspectable operation: generate or verify PostgreSQL legacy MD5 and MySQL 4.1 native password records with the exact username rule and visible retirement warnings. It reproduces only two unambiguous stored-record formats: PostgreSQL md5(password plus role name) and MySQL double-SHA-1 native password. Inputs, parameters, and output encoding remain visible together so you can reproduce the result with another trusted tool instead of accepting an unexplained answer.
The workspace does not send the entered value to NexaCurrent. Ordinary text, passwords, keys, tokens, and generated results stay in the current browser tab and are not added to the page URL or saved to an account. Copy controls report success or failure, and Reset removes the visible working state so the next person using the browser is not shown the previous result.
When to use this free online cryptography tool
Typical uses include controlled database migrations, old backup inspection, record-format tests, and confirming a supplied legacy password. Begin with a documented example or non-sensitive test value, record every selected option, and compare the result with the system that must consume it. Cryptographic formats often fail because one side chose different text encoding, padding, nonce, key derivation, output alphabet, or signature parameters rather than because the mathematical primitive is broken.
Before relying on a result, compare a published test value with its expected answer and also try one deliberate failure. A successful round trip on this page only proves that its matching operations agree; it does not by itself prove compatibility with another application, security policy, key store, certificate format, or threat model.
Security, privacy, and compatibility limits
The central limitation is explicit: both formats are legacy, MySQL native password is removed from current MySQL releases, and new PostgreSQL deployments should use SCRAM-SHA-256. Names on this site distinguish encryption, hashing, message authentication, checksums, encoding, obfuscation, and steganography because those operations solve different problems. A reversible transform is not automatically secure, and a one-way digest is not encrypted text waiting to be decoded.
Browser-local processing reduces accidental server disclosure but does not make an untrusted device safe. Browser extensions, clipboard history, malware, screenshots, compromised dependencies, and a modified page can still expose secrets. Use audited command-line or platform key-management tools for high-value production keys, recovery codes, private certificates, regulated data, and long-term credential storage.
How to verify the result
Check the selected algorithm, character encoding, key or keyword, output format, and every length field before copying the result. For encryption, alter one character or try the wrong key and confirm that an authenticated mode rejects it. For a signature or HMAC, verify the original message and then confirm that a modified message fails. For a checksum or historical cipher, compare against a published test value or a second trusted tool.
Keep sensitive values out of support tickets, analytics screenshots, public URLs, and shared chat logs. If the task is migration, retain a protected copy of the original data until the destination has been independently validated. If a legacy page is the only one that can read an old value, use it to recover and immediately re-protect the content with a current authenticated format rather than generating more legacy ciphertext.