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FlexibleToolsAI
Security Toolkit · 100% Client-Side Private

SHA-1 Hash Generator

Generate SHA-1 hashes of text and files for legacy checksums, Git object IDs and older APIs — processed locally in your browser, with a note on when SHA-1 is no longer safe.

Type or paste text to get its SHA-1 hash instantly, or drop a file of any size to hash it in chunks on your device. Choose hex or Base64 output, and paste an expected checksum to verify a match. SHA-1 is legacy and collision-prone; use SHA-256 for new work.

SHA-1 hash

da39a3ee5e6b4b0d3255bfef95601890afd80709

160-bit digest · 40 hex characters · text is hashed as UTF-8

SHA-1 is broken for collision resistance (SHAttered, 2017). Fine for legacy checksums and Git object IDs, not for new security uses.
A hash is one-way: it can't be “decrypted”. Sites that claim to reverse SHA-1 only look the hash up in tables of previously hashed common strings. For passwords, use a slow hash like bcrypt or Argon2 — never plain SHA-1.

Zero Server Uploads

Files process in local RAM

Instant WASM Speed

No waiting queues or lags

Unlimited Batching

Convert files without limits

Suggest a Feature or Improvement for SHA-1 Hash Generator

Need custom options, higher limits, or extra format support? Let our engineering team know!

How to use SHA-1 Hash Generator

  1. 1Choose Text or File.
  2. 2Type the text or drop the file — the hash updates instantly.
  3. 3Pick hex (lower or upper case) or Base64 output.
  4. 4Paste an expected hash to verify a download or value.

About SHA-1

SHA-1 produces a 160-bit (40 hex character) digest. It's still used by Git object IDs, older software checksums and some legacy APIs and HMAC schemes.

Since the SHAttered attack in 2017, practical SHA-1 collisions exist, so browsers and CAs stopped trusting SHA-1 certificates. HMAC-SHA1 remains secure, but for new designs choose SHA-256 or SHA-3.

Hashing isn't encryption

A hash function turns any input into a fixed-size fingerprint. The same input always gives the same hash, the smallest change gives a completely different one, and there's no key to reverse it — which is why “hash decrypters” only look up precomputed hashes of common strings.

Hash text for checksums, deduplication and signatures; store passwords with a slow, salted algorithm like bcrypt instead. Verify downloads with the File Hash Checker.

Frequently Asked Questions

Is SHA-1 still safe?

Not for collision resistance (signatures, certificates). It's acceptable for non-adversarial checksums and HMAC-SHA1, but new systems should use SHA-256.

Can a hash be decrypted?

No. Hashes are one-way. Sites that “decrypt” hashes just search tables of hashes of common words and leaked passwords, which is why short or common inputs can be found and long random ones can't.

Is my data sent to your server?

No. This tool runs entirely in your browser using the Web Crypto API and JavaScript. Nothing you type or generate is uploaded, logged or stored.

Related Tools

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MD5 Hash Generator

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HMAC Generator

Generate and verify HMAC signatures with SHA-256, SHA-512, SHA-1, MD5 or SHA-3.