checksum.name

160-bit digest · local only

SHA1 Hash Generator

Compute SHA-1 hashes for text and files locally in your browser — for legacy checksums, Git objects and compatibility needs.

All files are processed locally in your browser — your data never leaves your device.

SHA1 Hash Generator
Or drop a file
Drop a file here or click to browse Large files supported — streamed in chunks, never uploaded

About SHA-1

SHA-1 produces a 160-bit digest — 40 hexadecimal characters — and for two decades it was the workhorse hash of the internet. Today it lives on mainly in legacy contexts: older download mirrors that still publish SHA-1 checksums, Git's object identifiers, and existing systems that have not yet migrated. Since 2017, practical collision attacks (the "SHAttered" research) mean SHA-1 should no longer be trusted for signatures, certificates or any adversarial setting.

That said, there are still legitimate reasons to compute a SHA-1 hash: matching a checksum that a vendor published years ago, cross-checking a Git blob or commit hash, or interoperating with a protocol that specifies SHA-1. This SHA1 hash generator handles those cases — type text or drop a file, and the digest is computed locally with streamed chunk processing for large files.

Choosing a stronger alternative

If you control both ends of the verification — you are the one publishing the checksum — use SHA-256 or SHA-512 instead. They are just as easy to generate here and are immune to the collision attacks that broke SHA-1 and MD5. For checking whether two hash values match exactly, paste them into the hash compare tool.

Also try our: SHA256 Hash Generator · MD5 Hash Generator · Hash Compare Tool

§ Frequently Asked Questions

Is my data uploaded when generating a SHA-1 hash?
No. SHA-1 hashes are computed locally in your browser. Your text and files never leave your device.
How long is a SHA-1 hash?
A SHA-1 hash is 160 bits, displayed as 40 hexadecimal characters.
Is SHA-1 still secure?
No. Practical collision attacks against SHA-1 have existed since 2017. It remains acceptable for legacy checksum matching and non-adversarial integrity checks, but new systems should use SHA-256 or SHA-512.
Why does Git use SHA-1?
Git adopted SHA-1 as its object identifier before the collision attacks were practical. Git uses it for content addressing rather than security, and newer Git versions include collision detection and support SHA-256 repositories.

Other Hash Tools

Checksum Calculator MD5 Hash Generator SHA256 Hash Generator SHA512 Hash Generator CRC Calculator File Checksum Calculator HMAC Generator Hash Compare Tool