SHA-1 hash generator
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Quick answer
SHA-1 produces a 160-bit (40-hex-character) digest. TryDevSnip hashes text or files with Web Crypto in your browser — input is not uploaded to our servers for processing.
SHA-1 is widely available for legacy checksums and Git object ids, but it is not collision-resistant for security. Prefer SHA-256 for new integrity checks.
Digest size: 160-bit (40 hex chars)
Do not use SHA-1 for password storage or security-critical signatures. Prefer SHA-256 or stronger, and a dedicated password hash (Argon2/bcrypt) for credentials.
SHA-1 at a glance
| Digest size | 160-bit (40 hex chars) |
|---|---|
| Output form | Lowercase hex, 40 characters, fixed regardless of input size |
| Reversible? | No — one-way by design, but collision resistance is broken: Google's 2017 SHAttered attack produced two different PDFs sharing a SHA-1 digest |
| Runs where | In your browser via the Web Crypto API (crypto.subtle.digest) — input is never uploaded |
Reading a checksum comparison
A SHA-1 comparison still answers one precise question: are these two inputs byte-for-byte identical? What changed in 2017 is how much weight a single match should carry when the hash itself might have come from someone with reason to cheat.
- Hash the right thing. Digesting an archive is not the same as digesting the file inside it, and a trailing newline changes a text digest. Most "wrong hash" reports turn out to be a different input, not a bad implementation.
- Compare case-insensitively. The same digest is printed lowercase by some tools and uppercase by others. A mismatch in case alone is not a mismatch.
- One bit changes everything. A single altered byte produces a completely different digest, so "nearly matching" hashes carry no meaning — it is equal or it is not.
- A match proves less than it used to. SHA-1 is no longer collision-resistant, so a matching digest doesn't rule out a deliberately engineered duplicate. Pair it with HTTPS from a source you trust, or better, verify against a SHA-256 checksum instead.
- Not a password hash. Fast, general-purpose digests are the wrong tool for credentials regardless of collision status; those need a deliberately slow, salted function such as Argon2, bcrypt, or scrypt.
Other hashes: SHA-256 · SHA-384 · SHA-512 · MD5
Frequently asked questions
How do I generate a SHA-1 hash?
SHA-1 produces a 160-bit (40-hex-character) digest. TryDevSnip hashes text or files with Web Crypto in your browser — input is not uploaded to our servers for processing.
How long is a SHA-1 digest?
SHA-1 outputs a 160-bit (40 hex chars) hexadecimal string on TryDevSnip.
Is SHA-1 safe for passwords?
Do not use SHA-1 for password storage or security-critical signatures. Prefer SHA-256 or stronger, and a dedicated password hash (Argon2/bcrypt) for credentials.
Is my text or file uploaded?
No. TryDevSnip hashes in your browser. Nothing you type or select is uploaded to our servers for processing.