Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text free online. Verify file integrity and check passwords with instant hash generation.
How to Use Hash Generator
- 1Enter or paste text into the input field.
- 2All hash formats (MD5, SHA-1, SHA-256, SHA-512) are generated automatically.
- 3Click any hash value to copy it to clipboard.
- 4Toggle hex/base64 output format as needed.
- 5Use the file input to compute the hash of a local file for integrity verification.
About Hash Generator
The Hash Generator computes cryptographic hashes of any text input using the Web Crypto API. Supports MD5, SHA-1, SHA-256, SHA-384, and SHA-512 algorithms. Hashes are one-way functions — the same input always produces the same hash, but the hash cannot be reversed to the original input. Used for password storage, file verification, and data integrity checking.
Frequently Asked Questions
- What is a cryptographic hash function?
A hash function takes any input and produces a fixed-length output (the hash or digest) with three key properties: deterministic (same input → same output), one-way (cannot reverse the hash to get the input), and collision-resistant (practically impossible to find two inputs with the same hash).
- What is the difference between MD5, SHA-1, and SHA-256?
MD5 produces a 128-bit hash; SHA-1 produces 160 bits; SHA-256 produces 256 bits. MD5 and SHA-1 are cryptographically broken — known collision attacks exist. SHA-256 (part of SHA-2) is currently secure and recommended for security applications. SHA-512 provides 512 bits for the highest security margin.
- What is SHA-256 used for?
SHA-256 is used in: Bitcoin and blockchain proof-of-work, TLS/SSL certificates (digital signatures), file integrity verification (checksums), password hashing (as part of bcrypt/PBKDF2), HMAC message authentication codes, and git commit hashes.
- Can I use SHA-256 to hash passwords?
Do not use plain SHA-256 for password hashing — it is too fast, making brute-force and rainbow table attacks feasible. Instead, use slow password-hashing functions: bcrypt, scrypt, or Argon2. These are designed specifically for passwords and are built into most web frameworks.
- What is the difference between hex and base64 encoding?
Both represent the same binary hash data in different text formats. Hex uses characters 0–9 and a–f, producing a longer string (SHA-256 = 64 hex chars). Base64 uses A–Z, a–z, 0–9, + and /, producing a shorter string (SHA-256 = 44 base64 chars). Base64 is more compact; hex is more readable.
- What is an HMAC and how is it different from a plain hash?
HMAC (Hash-based Message Authentication Code) combines a hash with a secret key: HMAC = hash(key + message). A plain hash only verifies data integrity (the data hasn't changed). HMAC additionally verifies authenticity (the sender knows the secret key). Used in API authentication, JWT signing, and webhook verification.
- How do I verify a file's checksum?
The file download page shows the expected SHA-256 hash. Compute the hash of your downloaded file and compare them character by character. If they match, the file is intact and unmodified. If they differ, the file is corrupted or tampered with and should be re-downloaded.
Looking for more tools like this? Browse all Developer Tools →
More Developer Tools
JSON Formatter
Format, validate, and minify JSON online. Instantly beautify or compress JSON data with syntax highlighting. Free JSON formatter and validator.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to plain text online. Free Base64 encoder decoder tool for developers and data analysts.
URL Encoder / Decoder
Encode or decode URLs and query strings online. Convert special characters to percent-encoding instantly. Free URL encoder decoder for developers.
Password Generator
Generate strong, random passwords instantly. Customize length and character types. Free secure password generator tool for safe online accounts.
Color Converter
Convert colors between HEX, RGB, HSL, and HSB online free. Pick colors visually and copy CSS values in any format instantly — no signup needed.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and times online free. Convert dates to Unix timestamps in seconds or milliseconds instantly.
You Might Also Like
Word Counter
Count words, characters, sentences, and paragraphs instantly. Free online word counter tool with reading time estimate for writers and students.
Character Counter
Count characters with and without spaces instantly. Free online character counter for Twitter, Instagram, SMS, and meta tag length limits.
Percentage Calculator
Calculate percentages, percentage change, and what percent one number is of another. Free online percentage calculator for everyday math.
Last updated: May 2, 2026 — Hash Generator by CalcDash.