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Online SHA-1 Hash Generator Tool

Hash generator for text and files — MD5 to SHA-3, no upload.

  • Runs on your device
  • 8 algorithms · MD5 to SHA-3
  • Verify a checksum in one paste
  • Free to 250 MB · Batch with Pro
Characters: 0Bytes: 0Algorithms: 1
Generated hashes

Paste the value the publisher gave you. The algorithm is worked out from its length.

Enter text or add a file, then the digests appear here.

Use SHA-256, SHA-512 or SHA3-256 for modern security. MD5 and SHA-1 are legacy algorithms and should not be used for password storage; CRC-32 detects accidental corruption only.

Algorithms

Every algorithm is free. Selecting more costs time, not another read of the file.

Output format
Output format
HMAC key
Key is

Leave empty for a plain digest. With a key, every selected algorithm produces an HMAC instead.

Batch export
Pro

Available with Pro, once more than one file has been hashed.

Hashing as you type

Related tools

SHA-1 Hash Generator

Generate SHA-1 hashes from text on your device. For compatibility use.

SHA-1 produces a 160-bit (40-character hex) hash. It was widely used for security (e.g. Git, TLS) but is now deprecated for new security use due to practical collision attacks. It's still useful for compatibility with Git, legacy APIs, or older systems. Our generator runs on your device; no data is uploaded.

When to use SHA-1 Hash Generator vs other options

Use SHA-1 when you need compatibility with Git (commit hashes), legacy APIs, or existing systems that require SHA-1. For any new security or integrity use, prefer SHA-256. Use MD5 only for non-security checksums or when a system requires it. Do not use SHA-1 for new password hashing or signatures.

Compatibility

SHA-1 is supported in most languages and tools. Git still uses SHA-1 for commit IDs. Many legacy systems and APIs expect SHA-1. For new designs, choose SHA-256. All hashing here is on-device.

Quality considerations

SHA-1 is no longer considered secure against collision attacks; NIST and others have deprecated it for signatures. For non-adversarial uses (e.g. Git-style IDs, legacy checks), it's still acceptable. Do not rely on SHA-1 for verifying untrusted or high-value content.

Example use cases

  • Understand or verify Git commit or object hashes (SHA-1).
  • Match legacy systems or APIs that require SHA-1 output.
  • Generate checksums for internal or non-security file checks.
  • Compatibility testing with tools that only accept SHA-1.
  • Educational or comparison use alongside MD5 and SHA-256.

Powered by optimised image processing algorithms.

← All algorithms (MD5, SHA-256, SHA-1) · MD5, SHA-256

Frequently asked questions

What is SHA-1 and how does this tool work?

SHA-1 produces a 160-bit digest shown as 40 hexadecimal characters. Type or paste text and the SHA-1 hash updates instantly on your device. You can copy it, download it, or paste an expected hash to compare values and confirm they match, which is handy for Git-style IDs and legacy checks.

Is my data private when I use this tool?

Yes. SHA-1 hashing runs entirely on your device with JavaScript. Your text is never uploaded to a server, stored, or logged, and it only leaves your device if you copy or download the digest yourself, so sensitive input stays on your machine.

Is SHA-1 secure? Should I use it for new projects?

Not for security. Practical collision attacks mean SHA-1 must not be used for new passwords, digital signatures, or high-assurance integrity, and it is no longer collision-resistant. Choose SHA-256 for anything security-sensitive and keep SHA-1 for compatibility only.

Can I reverse a SHA-1 hash back to the text?

No. SHA-1 is a one-way hash, not encryption, so there is no key to recover the original input from the digest. Identical text always yields the same 40-character hash, but a digest cannot be mathematically reversed back to the source string.

When should I use SHA-1?

Use SHA-1 for compatibility: verifying or understanding Git commit and object IDs, matching legacy systems and APIs that still specify SHA-1, running non-security internal checksums, or comparing algorithms for learning. For new security work, use SHA-256 instead.

Is it free, and does it work offline and on mobile?

Yes. The SHA-1 generator is free — up to 5 MB of pasted text or one file up to 250 MB at a time on the free plan, and Pro lifts both caps. Since it runs on-device, it keeps working once the page loads even without a connection, and it behaves the same on desktop and mobile browsers, hashing your text locally every time.

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