DEV NO.006
Hash Calculator
MD5, SHA-1, SHA-256 and SHA-512 checksums for text and files — computed in seconds.
This tool runs entirely in your browser. Nothing is uploaded to any server.
What is this
什么是哈希
哈希函数把任意输入映射为固定长度的「指纹」——输入哪怕改动一个字节，指纹也会完全不同。用途：文件完整性校验、去重、密码存储（需加盐慢哈希）。
What is a hash
A hash function maps any input to a fixed-length fingerprint. Change one byte and the fingerprint changes completely — the basis of integrity checks, deduplication and (properly salted) password storage.
如何使用
- 文本模式：粘贴文本即得四种哈希。
- 文件模式：拖入文件，自动计算 SHA 系列；MD5 在浏览器内用 JS 实现。
- 复制任一指纹用于比对。
FAQ
How do I verify a downloaded file?
Drop the file here, compute its SHA-256 and compare it character-by-character with the checksum published by the source.
Is MD5 still safe?
MD5 and SHA-1 are broken for security purposes (collisions are practical). Fine for non-adversarial checksums, but choose SHA-256 for anything new.
Are files uploaded?
No. Files are hashed locally with the Web Crypto API — you get full speed with zero uploads.