Text to SHA-256 Hash Generator

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SHA-256 Hash Generator (WebCrypto)

Hash tool · Where to use · Best Practices · Details · FAQ · Related tools

SHA-256 Hash Generator Secure

From Text
From File
📁

Drop file here or click to select

Maximum 100MB file size supported

File name
File size
SHA-256 Hash Result
Hash will appear here
Hash Length: 0
Characters: 0
Bytes: 0
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Common Use Cases & Examples

📥 Downloads
Verify file integrity using publisher-provided checksums
integrity
📦 Releases
Publish hashes for binaries/assets to detect tampering
checksums
🔐 API Signatures
Use HMAC-SHA-256 to sign requests
HMAC
🧪 Data Pipelines
Deduplicate or fingerprint blobs/records
fingerprint
🧂 Don’t hash passwords directly
Use Argon2, bcrypt, or PBKDF2 with salt & proper parameters.
🔐 Prefer HMAC for authenticity
Plain hashes don’t prove who produced the data — HMAC with a secret key does.
📏 Encode consistently
Always hash the same byte representation (UTF-8). Mixed encodings lead to mismatches.
🧮 Show both hex & Base64
Hex is common in CLIs; Base64 is compact for UIs/APIs.
🧩 Technical Implementation
Uses WebCrypto API: crypto.subtle.digest("SHA-256", data)

🔐 SHA-256 Basics

  • Hash text to SHA-256 (hex or Base64)
  • Hash files in the browser (ArrayBuffer)
  • Verify by comparing computed vs. expected digest
  • HMAC-SHA-256 (hash with a secret key)
  • All hashing happens locally using the Web Crypto API — nothing is uploaded.

🧾 Hash vs. HMAC

  • Hash: digest of data only (public, anyone can recompute)
  • HMAC: digest using a secret key(authenticates source & integrity)

📥 Inputs

  • Text: UTF-8 encoded (emoji & non-Latin supported)
  • Files: drag & drop or file picker (size limited by memory)
  • Output: hex (default) or Base64

ℹ️ About SHA-256

  • Secure hash from the SHA-2 family (256-bit output)
  • Designed for integrity (not encryption)
  • Do not use plain SHA-256 for password storage — use Argon2/bcrypt/PBKDF2 instead

⚙️ How to use the SHA-256 hash generator

  1. Choose Text or File mode.
  2. Enter text or drop a file; select output as Hex or Base64.
  3. Click Compute to calculate the SHA-256 digest locally.
  4. (Optional) Enter an Expected hash to auto-verify.
  5. (Optional) For HMAC-SHA-256, provide a secret key and compute.

🧭 Alternative steps

  1. Enter text or pick a file (you can also drop a file onto the box).
  2. Click Compute; the hex digest appears below.
  3. Works with common types of files; very large file size depends on available memory.
  4. To verify, compare the result with a publisher’s checksum to confirm integrity.
  5. Compute a SHA-256 hash for text or a whole file directly in your browser. Use the file picker or just drop a file to get a hex digest instantly. This tool implements a secure hash (cryptographic hash function) to help verify file integrity for downloads and releases.

💡 Tips

  • Whitespace & newlines matter — hashes change if the text changes even slightly.
  • Large files may need time/memory; keep the tab focused for best performance.
  • CLI compare: shasum -a 256 file (macOS) or sha256sum file (Linux).

✅ Integrity & security notes

SHA-256 outputs 256 bits (not 512 bits) and is designed for collision resistance. For security applications such as digital signatures or request signing, use HMAC-SHA-256. Never store passwords with plain SHA-256 — use Argon2/bcrypt/PBKDF2 with salt & proper parameters.

SHA-256 – Frequently Asked Questions

Enter text or pick a file, then click Compute (or press Ctrl/Cmd+Enter). The hex digest will be shown in the output box.

A hash function maps input data to a fixed-length value. SHA-256 is a cryptographic hash function used to create a secure hash (checksum) for integrity checks.

It’s hard to find two different inputs with the same digest. SHA-256 is designed for strong collision resistance for integrity and signing workflows.

No. All hashing is performed locally in your browser using the WebCrypto API. Nothing leaves your device.

Yes—subject to available memory in your browser. For multi-GB files, use a desktop tool that supports streaming.

No. SHA-256 is a cryptographic hash function. It’s designed to be one-way and collision-resistant.

Common uses include verifying file integrity, creating content fingerprints, and storing checksums.