Use hashing for integrity
A SHA-256 digest helps verify whether a file or payload changed in transit.
Security & Auth 6 min read 2026-03-13
Hash vs Encryption: The Difference Developers Actually Need
A practical explanation of hashing, encryption, and when each one belongs in a developer workflow.
Intro
Hashing and encryption both transform data, but they solve different problems. Confusing them leads to bad architecture choices, especially around passwords, integrity checks, and secret storage.
The shortest distinction is this: encryption is reversible with a key, hashing is designed to be one-way.
What is it?
Hashing turns input into a fixed-length digest intended for integrity checks, indexing, or password workflows.
Encryption transforms plaintext into ciphertext so the original data can be recovered later with the correct key.
Why it matters
- You should not encrypt passwords when you actually need one-way password hashing.
- You should not use a raw hash when the real requirement is confidentiality.
- Picking the right primitive improves both security and maintainability.
Examples
Use encryption for secrecy
API tokens or stored secrets need a reversible scheme if the application must recover the original value.
Common mistakes
- Storing passwords with raw SHA-256 instead of a password hashing function like bcrypt.
- Calling Base64 encoding “encryption.”
- Using hashing when the data must later be recovered.
- Ignoring salting and work factors in password storage.
Use the tool
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Generate SHA-1, SHA-256 and SHA-512 hashes in the browser.
Open full tool pageFAQ
Can encryption replace hashing?
Not usually. Encryption is reversible and serves confidentiality. Hashing is typically one-way and serves integrity or password verification workflows.
Is SHA-256 good for passwords?
No, not by itself. Use a dedicated password hashing function such as bcrypt, scrypt, or Argon2.