#️⃣ Hash Generator
What Is Hashing?
A hash function takes any input (text, file, password) and produces a fixed-length string of characters called a digest or hash. The same input always produces the same hash, but even a tiny change to the input — like changing a single letter — produces a completely different hash. This one-way property makes hashing fundamental to computer security: you can verify data without revealing or storing the original.
Unlike encryption, hashing is irreversible by design. You cannot reconstruct the original input from its hash. This is why passwords are stored as hashes rather than in plain text — even if the database is stolen, the original passwords remain protected.
Example: SHA-256 hash
SHA-256: b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9
SHA-256: 7a38bf81f383f69433ad6e900d35b3e2385593f76a7b7ab5d4355b8ba41ee24b
Hash Algorithms Compared
| Algorithm | Output length | Security | Speed | Use case |
|---|---|---|---|---|
| SHA-256 | 64 hex chars (256 bits) | Strong | Fast | General purpose, blockchain, certificates |
| SHA-384 | 96 hex chars (384 bits) | Strong | Fast | TLS, when extra length is needed |
| SHA-512 | 128 hex chars (512 bits) | Very strong | Fast (64-bit) | High-security applications |
| SHA-1 | 40 hex chars (160 bits) | Broken | Very fast | Legacy only — do not use for security |
| Base64 | Variable | Not a hash | Instant | Encoding binary data as text |
| CRC32 | 8 hex chars (32 bits) | None | Instant | Error detection, checksums |
Common Use Cases
File integrity verification
Download a file and compare its SHA-256 hash against the publisher’s listed hash to verify it wasn’t tampered with during download.
Password storage
Applications store password hashes (ideally using bcrypt or Argon2, which add salting and stretching on top of basic hashing) rather than plain text passwords.
Data deduplication
Hash file contents to detect duplicates without comparing the full files byte-by-byte. Cloud storage services use this technique extensively.
Digital signatures
Sign the hash of a document rather than the document itself. This is how HTTPS certificates, code signing, and document signing work.
Frequently Asked Questions
No. SHA-1 has been practically broken since 2017, when Google demonstrated a collision attack (two different inputs producing the same hash). It should only be used for non-security purposes like legacy system compatibility. For any security application, use SHA-256 or SHA-512.
No. Base64 is an encoding, not a hash. It transforms binary data into ASCII text and is fully reversible. It provides no security whatsoever. It’s included in this tool for convenience since developers frequently need both hashing and encoding.
This tool hashes text input. For file hashing, you would need to read the file contents first. On the command line, you can use sha256sum filename (Linux/Mac) or Get-FileHash filename (PowerShell).
Yes. Hash computation happens entirely in your browser using the Web Crypto API. Your text input is never sent to any server. You can verify this by monitoring the Network tab in your browser’s developer tools.
Each algorithm is designed to produce a specific output size. SHA-256 always outputs 256 bits (64 hex characters), SHA-512 always outputs 512 bits (128 hex characters), regardless of input size. Longer outputs provide more collision resistance but take slightly more storage space.
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