Hash Generator

Key takeaways

• SHA-1 and SHA-2 family via SubtleCrypto
• Hex digest output
• Input stays in the browser
• Not a substitute for password hashing KDFs

What is a cryptographic hash?

A hash function maps input to a fixed-length digest. Small input changes produce very different outputs; the original input cannot be recovered from the digest alone.

Hashes are for integrity checks and fingerprints, not confidentiality. Do not store passwords as raw SHA digests — use a dedicated password KDF. MD5 is not offered here because Web Crypto does not expose it.

Features

• Multiple algorithms

  Switch between SHA-1 and the SHA-2 family in one workspace.

• Hex output

  Lowercase hexadecimal digests ready for configs and comparisons.

• Input limits

  Enforces shared character limits to keep the tab responsive.

• Private by default

  Hashing stays on-device via SubtleCrypto.

How it works

1. 1

   Paste text

   Enter the string you want to hash (UTF-8 bytes).

2. 2

   Pick an algorithm

   Choose SHA-1, SHA-256, SHA-384, or SHA-512.

3. 3

   Hash & copy

   Generate the digest and copy the hex string.

Example walkthroughs

• Hello

  SHA-256 of “hello” is 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824.

  hello

• Pangram

  A longer ASCII sample — SHA-256 is d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592 when the algorithm is set to SHA-256.

  The quick brown fox jumps over the lazy dog

Supported algorithms

Use cases

• Cache keys

  Derive stable keys from request bodies or query strings.

• Integrity checks

  Compare digests when verifying copied payloads.

• Debug pipelines

  Confirm hashing matches between services during local testing.

Code snippets

• SHA-256 with Web Crypto

  js

  Hash Generator uses SubtleCrypto the same way for SHA algorithms.

  const data = new TextEncoder().encode(text);
  const digest = await crypto.subtle.digest("SHA-256", data);
  const hex = [...new Uint8Array(digest)]
    .map((b) => b.toString(16).padStart(2, "0"))
    .join("");

Common errors

• Digest does not match another service

  Cause: Different algorithms, encodings, or trailing newlines in the input.

  Fix: Confirm UTF-8 text, trim consistently, and match SHA-1 vs SHA-256.

• Looking for MD5

  Cause: Web Crypto does not expose MD5.

  Fix: Prefer SHA-256 for new work; MD5 is intentionally not offered here yet.

About Hash Generator

El Generador de Hash calcula digests criptográficos de texto con la Web Crypto API — SHA-1, SHA-256, SHA-384 o SHA-512 — e imprime hex en minúsculas listo para configs y comparaciones. Úsalo para checksums, claves de caché y depuración entre servicios.

Los hashes son huellas unidireccionales, no cifrado. Pequeños cambios de entrada producen salidas muy distintas; no puedes recuperar el texto original solo del digest. No almacenes contraseñas como digests SHA en bruto — usa un KDF de contraseñas dedicado. MD5 se omite a propósito porque Web Crypto no lo expone.

El cálculo del digest se queda en el navegador vía SubtleCrypto. Pega cuerpos de petición o cadenas de fixture sin subirlos a un sitio de hash alojado. Alinea bien las codificaciones: saltos de línea finales y UTF-8 frente a otras codificaciones son motivos habituales de desacuerdo entre dos cadenas “idénticas”.

Buena práctica: prefiere SHA-256 o superior para nuevas comprobaciones de integridad; trata SHA-1 solo como legado. Alinea algoritmo y normalización con el otro servicio antes de depurar desajustes. Usa el Generador UUID para IDs aleatorios y Base64 cuando necesites codificación reversible en lugar de un digest.

Frequently asked questions

Explore more

• All developer tools

  Browse formatters, converters, encoders, and more.

• Hash tools

  SHA digests and checksum helpers that run in your browser.