Before building our SHA-1 hash generator, we checked two existing tools directly.
A collision warning, not silence
We checked sha1-online.com directly and found no mention anywhere on the page that SHA-1 has a known, practical collision attack (Google and CWI Amsterdam's SHAttered, 2017) — the same gap we found in an MD5 tool for password advice. SHA-1 is still fine for Git commit hashes and everyday checksums, but not for anything security-critical, and this tool says so up front.
Live, without a Generate click
A different tool, hashgenerator.co, does include a solid collision warning — but its own instructions say to "enter text and click Generate." Ours updates the moment you type, no button.
No artificial file size cap
That same tool limits file uploads to 50MB. For a hash that runs entirely in your browser, that's not a technical necessity — it's an arbitrary limit. Ours doesn't impose one; it's bounded only by what your browser can actually handle.
