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SHA-1 Hash Generator
⌃⏎ run · ⎋ clear · / focus input
⇅ drop a file to hash it
// about this tool

SHA-1 Hash Generator Online

Updated 2026-10-24

SHA-1 hashes your input into a 40-character hex digest, calculated entirely client-side, so the text never leaves your machine. The NSA designed it in 1995 as a successor to the weaker MD5, and it went on to become the backbone of early TLS, code signing, and Git.

It didn't age any better: Google and CWI Amsterdam published a working collision ("SHAttered") in 2017, and browsers and certificate authorities dropped it soon after. Git still identifies objects by SHA-1 hash today (a migration to SHA-256 object IDs is an ongoing, separate effort), but for anything where an adversary could benefit from a forged match, move to SHA-256.

// how to use

  1. 1 Paste or type your text into the input panel on the left.
  2. 2 The 40-character SHA-1 digest appears in the output panel on the right as you type.
  3. 3 Toggle the lowercase/uppercase option if you need the hex in a specific case.
  4. 4 Use the Copy button to grab the digest.

// examples

Hashing a short string
Input
hello
Output
aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d
Hashing a sentence
Input
The quick brown fox jumps over the lazy dog
Output
2fd4e1c67a2d28fced849ee1bb76e7391b93eb12

// common uses

Working with legacy systems that expect SHA-1 Inspecting Git object identifiers Non-security checksums and fingerprints Comparing against existing SHA-1 hashes

// faq

Is my text sent anywhere?
No. The digest is computed locally, the same way `git hash-object` computes one when you stage a file; SHA-1 is still what Git uses under the hood for that, even post-SHAttered.
Can a SHA-1 hash be reversed or decrypted?
No. SHA-1 is a one-way cryptographic hash, so a digest cannot be turned back into the original text. The only way to match a digest is to hash candidate inputs and compare.
Is SHA-1 safe to use for security?
No. SHA-1 is no longer collision-resistant (practical collisions have been demonstrated), so it must not be used for signatures, certificates, or passwords. Use SHA-256 instead.
What is the difference between SHA-1 and SHA-256?
Forty hex characters versus sixty-four is the visible difference. The practical one is that SHA-1's collision resistance is broken while SHA-256's isn't, so only one of the two belongs anywhere security-sensitive today.
What is SHA-1 still used for?
It survives in legacy systems and in non-security contexts such as Git object identifiers and old checksums, where it is a fingerprint rather than a defense against an attacker.

// works with your data

Hash Identifier SHA-256 Hash Generator MD5 Hash Generator HMAC Generator Hex to Decimal ROT13 / Caesar Cipher

Use this via API

Get a free API key → 
curl -X POST https://thesnaptools.com/api/v1/tools/sha1 \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text":"hello"}'