Five Algorithms in One Click
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes simultaneously, so you can compare or pick the algorithm your system requires.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text. Uses the native Web Crypto API. 100% client-side, no uploads, no tracking.
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Generate hashes without uploading your data
MD5, SHA-1, SHA-256, SHA-384, and SHA-512 in one click — right in your browser. No uploads, no sign-up, no limits.
100% private
Native Web Crypto API
Free forever
How to use
- 1
Enter Text
Type or paste the text you want to hash into the input box. The tool supports UTF-8, so international characters and emoji work correctly.
- 2
Click Compute
Click 'Compute Hashes' to generate all five hashes (MD5, SHA-1, SHA-256, SHA-384, SHA-512) at once.
- 3
Copy
Use the Copy button next to each hash to copy it to your clipboard. Toggle the uppercase/lowercase switch to match your system's expected format.
Why Use This Hash Generator?
Five algorithms in one click, powered by the native Web Crypto API.
Native Web Crypto API
SHA hashes are computed using the browser's built-in `crypto.subtle.digest`, which is hardware-accelerated and audited by browser vendors.
Uppercase Toggle
Switch between lowercase and uppercase hex output with one click to match the format your toolchain expects.
UTF-8 Safe
Correctly hashes text containing international characters, emoji, and other non-ASCII characters.
100% Private
All hashing happens in your browser. Your input text is never uploaded, stored, or logged.
Free with No Limits
No registration, no API key, no daily quotas. Free for personal and commercial use, forever.
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Understanding Cryptographic Hashes
What is a cryptographic hash function?
A cryptographic hash function is a mathematical algorithm that takes an input of any size and produces a fixed-size output called a hash (or digest). The same input always produces the same hash, but even a tiny change to the input produces a completely different hash. For example, the SHA-256 hash of 'hello' is '2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824', while the SHA-256 hash of 'Hello' (capital H) is '185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969'.
Good cryptographic hash functions have four key properties: (1) Deterministic — the same input always produces the same hash. (2) Fast — computing the hash is quick. (3) Avalanche effect — a small change in input produces a completely different hash. (4) Collision-resistant — it is computationally infeasible to find two different inputs that produce the same hash. SHA-256 and SHA-512 satisfy all four properties; MD5 and SHA-1 do not (they are not collision-resistant).
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MD5 and SHA-1 are broken
MD5 was broken in 2008 when researchers demonstrated a practical collision attack — they created two different executable files with the same MD5 hash. SHA-1 was broken in 2017 when Google and CWI Amsterdam announced the SHAttered attack, which produced two different PDF files with the same SHA-1 hash. Both algorithms should be considered cryptographically broken and should not be used for any security-sensitive purpose.
However, MD5 and SHA-1 are still used in legacy systems for checksum verification (where an attacker has no incentive to create collisions). Git uses SHA-1 for content addressing, though it is transitioning to SHA-256. Our tool includes MD5 and SHA-1 for these legacy use cases, but we clearly recommend SHA-256 or SHA-512 for any new application.
Hashing vs. encryption vs. encoding
Hashing is one-way: you cannot recover the input from the hash. Use it for integrity checks and password storage. Encryption is two-way with a key: you can decrypt the ciphertext back to the original. Use it for confidentiality. Encoding (like Base64) is two-way without a key: anyone can decode it. Use it for data compatibility, not security.
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Common Use Cases
Real-world scenarios where a hash generator is essential.
Data Integrity Checks
Verify that a file or message has not been altered by comparing its hash against a known good value.
Git-Style Content Addressing
Generate SHA-1 or SHA-256 hashes to identify content uniquely, similar to how Git stores objects.
Legacy System Integration
Some older APIs and protocols still require MD5 or SHA-1 hashes; this tool provides them without installing extra software.
Learning & Debugging
Quickly inspect the hash of a known input while learning about cryptography or debugging a hashing mismatch.
How does this compare to other hash generators?
A side-by-side comparison of popular hash generation tools.
| Feature | NovaTools | EMOCode | Browser console |
|---|---|---|---|
| Privacy (no upload) | 100% local | Uploads to server | Local |
| MD5 + SHA family | All 5 | SHA only (no MD5) | |
| Native Web Crypto API | Unknown | ||
| Uppercase toggle | Manual | ||
| UTF-8 support | Manual | ||
| Mobile friendly | Limited | ||
| Works offline | After page load |
Most online hash generators upload your text to their server. Our tool uses the browser's native Web Crypto API — your input never leaves your device.
Hash Algorithm Quick Reference
Key facts about common hash algorithms.
Algorithm Overview
| Symbol / Code | Description | Example |
|---|---|---|
MD5 | 128-bit output. BROKEN — do not use for security. Legacy checksums only. | d41d8cd98f00b204e9800998ecf8427e |
SHA-1 | 160-bit output. BROKEN since 2017. Used by Git (transitioning to SHA-256). | da39a3ee5e6b4b0d3255bfef95601890afd80709 |
SHA-256 | 256-bit output. SECURE. Recommended for new applications. | e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 |
SHA-384 | 384-bit output. SECURE. Use when 384-bit output is required. | 38b060a751...fbd51ad2f1... (96 chars) |
SHA-512 | 512-bit output. SECURE. Faster than SHA-256 on 64-bit CPUs. | cf83e1357eef...7da3e (128 chars) |
MD5128-bit output. BROKEN — do not use for security. Legacy checksums only.
Example:
d41d8cd98f00b204e9800998ecf8427eSHA-1160-bit output. BROKEN since 2017. Used by Git (transitioning to SHA-256).
Example:
da39a3ee5e6b4b0d3255bfef95601890afd80709SHA-256256-bit output. SECURE. Recommended for new applications.
Example:
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855SHA-384384-bit output. SECURE. Use when 384-bit output is required.
Example:
38b060a751...fbd51ad2f1... (96 chars)SHA-512512-bit output. SECURE. Faster than SHA-256 on 64-bit CPUs.
Example:
cf83e1357eef...7da3e (128 chars)Output Sizes
| Symbol / Code | Description | Example |
|---|---|---|
MD5 | 16 bytes → 32 hex characters. | 098f6bcd4621d373cade4e832627b4f6 |
SHA-1 | 20 bytes → 40 hex characters. | a94a8fe5ccb19ba61c4c0873d391e987982fbbd3 |
SHA-256 | 32 bytes → 64 hex characters. | 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08 |
SHA-512 | 64 bytes → 128 hex characters. | ee26b0dd4af7...28a8ff (128 chars, hash of test) |
MD516 bytes → 32 hex characters.
Example:
098f6bcd4621d373cade4e832627b4f6SHA-120 bytes → 40 hex characters.
Example:
a94a8fe5ccb19ba61c4c0873d391e987982fbbd3SHA-25632 bytes → 64 hex characters.
Example:
9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08SHA-51264 bytes → 128 hex characters.
Example:
ee26b0dd4af7...28a8ff (128 chars, hash of test)Use Cases
| Symbol / Code | Description | Example |
|---|---|---|
Integrity check | SHA-256 or SHA-512. Compare hash before/after transfer. | sha256sum file.zip |
Password storage | Use bcrypt, scrypt, or Argon2 — NOT plain SHA. | bcrypt(password, cost=12) |
Content addressing | SHA-256 (Git) or SHA-512 (IPFS). | git: SHA-1 of blob |
Legacy checksums | MD5 or SHA-1, only for backward compatibility. | md5sum legacy.tar.gz |
Integrity checkSHA-256 or SHA-512. Compare hash before/after transfer.
Example:
sha256sum file.zipPassword storageUse bcrypt, scrypt, or Argon2 — NOT plain SHA.
Example:
bcrypt(password, cost=12)Content addressingSHA-256 (Git) or SHA-512 (IPFS).
Example:
git: SHA-1 of blobLegacy checksumsMD5 or SHA-1, only for backward compatibility.
Example:
md5sum legacy.tar.gzFAQ
Which hash algorithms are supported?
MD5, SHA-1, SHA-256, SHA-384 and SHA-512. SHA-256 and SHA-512 are the recommended choices for any security-related use. MD5 and SHA-1 are provided for legacy compatibility only — they should not be used for new security applications. The SHA-2 family (SHA-256, SHA-384, SHA-512) is considered secure and is used by TLS, Bitcoin, Git, and most modern security systems. SHA-3 is a newer standard but is less widely deployed.
Is MD5 still safe to use?
No. MD5 is cryptographically broken and should never be used for password storage, digital signatures, or any security-sensitive purpose. Researchers demonstrated practical collision attacks against MD5 in 2008, meaning it is possible to create two different inputs that produce the same MD5 hash. MD5 is included in this tool only for checksum verification of legacy systems and for educational purposes. For any new application, use SHA-256 or stronger.
How are the SHA hashes computed?
SHA-1, SHA-256, SHA-384 and SHA-512 are computed using the browser's native Web Crypto API (`crypto.subtle.digest`), which is both fast and cryptographically secure. The Web Crypto API is implemented in native code by the browser vendor and is the same API used for TLS, certificate validation, and other security-critical operations. MD5 is not supported by the Web Crypto API (because it is insecure), so it is computed using a pure JavaScript implementation.
Can I hash files?
This tool hashes text only. The input is UTF-8 encoded before hashing, so it works correctly with international characters and emoji. For hashing files (images, documents, executables), you need to read the file as an ArrayBuffer and pass the raw bytes to the hash function. If you need to verify file integrity, use a command-line tool like `shasum` (macOS/Linux) or `Get-FileHash` (Windows PowerShell).
What is the difference between hashing and encryption?
Hashing is one-way — you cannot recover the original text from a hash. The same input always produces the same hash, but there is no way to reverse the process. Hashing is used for integrity checks, password storage (with salting), and digital signatures. Encryption is two-way — the ciphertext can be decrypted back to the original text using a key. Encryption is used for confidentiality. Use hashing when you need to verify data integrity or store passwords securely; use encryption when you need to protect data that must be recoverable.
What is a hash collision?
A hash collision occurs when two different inputs produce the same hash output. Due to the pigeonhole principle, collisions are mathematically inevitable for any hash function (since there are infinitely many possible inputs but only a finite number of hash outputs). However, for secure hash functions like SHA-256, finding a collision requires an astronomical amount of computation (approximately 2^128 operations for SHA-256). For broken hash functions like MD5, collisions can be found in seconds on a modern computer.
Should I use hashing for password storage?
Yes, but not with a plain hash function. Passwords should be hashed using a specialized password hashing algorithm like bcrypt, scrypt, Argon2, or PBKDF2. These algorithms are deliberately slow (to resist brute-force attacks) and use a salt (to resist rainbow table attacks). Plain SHA-256 is too fast for password storage — an attacker with a modern GPU can try billions of SHA-256 hashes per second. bcrypt and Argon2 are designed to be slow, making brute-force attacks impractical.
What is the difference between SHA-256 and SHA-512?
SHA-256 produces a 256-bit (32-byte, 64-character hex) hash, while SHA-512 produces a 512-bit (64-byte, 128-character hex) hash. SHA-512 is not 'more secure' in any practical sense — both have the same theoretical security level against collision attacks. SHA-512 is actually faster than SHA-256 on 64-bit processors because it processes data in 64-bit chunks. Choose based on your system's requirements: SHA-256 for shorter output, SHA-512 for 64-bit optimized performance.
Is this tool safe for sensitive data?
Yes. All hashing happens locally in your browser using the Web Crypto API. Your input text is never uploaded, stored, or logged. You can verify this by checking your browser's DevTools Network tab — no network requests are made when you hash text. This makes the tool safe for hashing API keys, tokens, and other sensitive data.
Can I use this tool for commercial projects?
Yes. The tool is free for both personal and commercial use with no watermarks, no attribution required, and no usage limits. You retain full ownership of your data. There is no registration, no API key, and no subscription required.
100% Client-Side & Private
All hashing happens in your browser using the Web Crypto API.
- Your input text is never uploaded, stored, or logged.
- All hash computation is performed locally — no network requests are made when you enter text or compute hashes.
- This makes the tool safe for hashing API keys, tokens, passwords, and other sensitive data.
You can use it with complete confidence, even on air-gapped networks.
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