What is a hash function?

A hash function is a cryptographic algorithm that converts input data of any size into a fixed-size string of bytes (hash). The output is unique to the input - even a tiny change produces a completely different hash. Hash functions are used for data integrity verification, password storage, and digital signatures.

Which hash algorithm should I use?

For modern security applications, use SHA-256 or SHA-512. MD5 and SHA-1 are considered cryptographically broken and should only be used for non-security purposes like checksums. SHA-256 is the most widely used secure hash algorithm today, offering a good balance of security and performance.

Can I hash files with this tool?

Yes, you can hash files of any size. Simply drag and drop your file into the upload area or click to browse. The tool will calculate the hash locally in your browser, so your files never leave your device. This is useful for verifying file integrity or generating checksums.

Are hashes reversible?

No, hash functions are one-way operations and cannot be reversed to recover the original input. This property makes hashes useful for password storage - you can verify a password by hashing it and comparing hashes, without storing the actual password.

Is this hash generator free?

Yes, this hash generator is completely free with no limitations. Generate unlimited hashes, no registration required, and all processing happens in your browser for privacy and security.

哈希生成器

生成加密哈希 (SHA-1, SHA-256, SHA-384, SHA-512)

文本输入

输入文本生成哈希

安全警告

此工具仅用于学习和开发目的。请勿用于生产环境安全。

SHA-1在加密学上已被破解，不应用于安全目的。请使用SHA-256或更高版本。

提示

• SHA-256适用于大多数用途（密码哈希、文件验证等）

• SHA-1已被弃用，仅应用于遗留兼容性

• 文件哈希对于验证文件完整性和检测篡改很有用

• 所有哈希计算都使用Web Crypto API在浏览器中本地执行