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

Hash Generator computes cryptographic digests of text using the Web Crypto API - SHA-1, SHA-256, SHA-384, or SHA-512 - and prints lowercase hex ready for configs and comparisons. Use it for checksums, cache keys, and cross-service debugging.

Hashes are one-way fingerprints, not encryption. Small input changes produce very different outputs; you cannot recover the original text from the digest alone. Do not store passwords as raw SHA digests - use a dedicated password KDF. MD5 is intentionally omitted because Web Crypto does not expose it.

Digest computation stays in the browser via SubtleCrypto. Paste request bodies or fixture strings without uploading them to a hosted hash site. Match encodings carefully: trailing newlines and UTF-8 vs other encodings are common reasons two “identical” strings disagree.

Best practice: prefer SHA-256 or stronger for new integrity checks; treat SHA-1 as legacy only. Align algorithm and normalization with the other service before debugging mismatches. Use UUID Generator for random IDs and Base64 when you need reversible encoding instead of a 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.