What is a cryptographic hash function?

A cryptographic hash function takes any input and produces a fixed-size output (the hash or digest). The same input always produces the same output, but small changes produce completely different hashes. Hashes are one-way — you cannot reverse them to recover the original input.

What is SHA-256 used for?

SHA-256 is the most widely used hash function, employed in TLS/HTTPS certificates, code signing, file integrity verification, Bitcoin, and HMAC. It produces a 256-bit (64 hex character) digest.

Is SHA-1 still safe to use?

SHA-1 is considered cryptographically broken for security purposes — collision attacks have been demonstrated. Do not use SHA-1 for digital signatures, certificates, or security-critical applications. It is still acceptable for non-security checksums.

Can I hash a file with this tool?

This tool hashes text input only. To hash a file, paste the file contents as text, or use command-line tools like sha256sum (Linux/Mac) or CertUtil (Windows).

What is Argon2 and when should I use it?

Argon2 is the winner of the 2015 Password Hashing Competition. Argon2id is the recommended variant for password hashing because it resists both side-channel and GPU attacks. Use Argon2id for storing passwords, not SHA-256.

What is SHA-3 and how does it differ from SHA-2?

SHA-3 (Keccak) uses a completely different sponge construction than SHA-2. Both are considered secure, but SHA-3 provides an independent algorithm family. SHA3-256 produces a 256-bit digest like SHA-256.

免费工具

Hash Generator

从任何文本生成 SHA-256、SHA-384、SHA-512 和 SHA-1 密码哈希值。所有处理都在您的浏览器中使用 Web Crypto API 进行。

Hash Generator

输入文本

大写输出

关于这些哈希函数

SHA-256 / SHA-512 — SHA-2 family. Recommended for checksums, data integrity, and HMAC.
SHA3-256 / SHA3-512 — SHA-3 (Keccak). Different construction from SHA-2; resistant to length-extension attacks.
Argon2id — Winner of the Password Hashing Competition. Memory-hard KDF — use for passwords, not data checksums.
MD5 / SHA-1 — Legacy. Cryptographically broken — do not use for security purposes.

所有哈希运行在您的浏览器中，使用 Web Crypto API — 数据不会离开您的设备。

什么是密码哈希函数？

密码哈希函数接收任意输入并生成固定长度的摘要。相同的输入总是产生相同的哈希值，但您无法从哈希值反向获取输入。哈希值用于密码存储、数据完整性验证和数字签名。

SHA-256 与 SHA-512

SHA-256 生成 256 位（64 个十六进制字符）摘要，是应用最广泛的。SHA-512 生成 512 位（128 个十六进制字符）摘要 — 更长且抗碰撞能力略强。SHA-1（160 位）被认为在密码学上已被破解，不应用于安全用途。

使用方法

在输入框中输入或粘贴文本。
点击生成哈希值。
复制任何 SHA-256、SHA-384、SHA-512 或 SHA-1 哈希值。

所有哈希运算都使用浏览器的 Web Crypto API — 您的文本不会离开您的设备。

常见问题

SHA-1 是否安全？: SHA-1 在密码学上已被认为是破解的，不应用于安全关键应用程序，如证书签名或密码哈希。此处仅为与遗留系统的兼容性而包含。
我可以对文件进行哈希而不是文本吗？: 此工具对文本输入进行哈希。对于文件哈希，请使用命令行工具，如 sha256sum 或 openssl dgst。