ToolRecipe
Stays on this device No watermark Works offline

What do you need to get done?

Drop a file here

or .

/

Open an app

Follow a recipe

All recipes

Use one tool

All tools

SHA-256 hash generator

Calculate the SHA-256 hash of text online, free. You get the 64-character hex digest that download pages, blockchains and certificates rely on. The other hashes are listed with it, and nothing is uploaded.

How to calculate a SHA-256 hash online

  1. 1Type or paste your text, or drop a text file
  2. 2Read the hash in the list as you type
  3. 3Press the copy button, or choose Uppercase
  4. A 64-character SHA-256 digest, in hex.

What happens to your data

  • Nothing is uploaded.The hash is calculated in your browser. Your text and files stay on your device.
  • The everyday safe choice.SHA-256 has no known practical attack and is the usual pick for integrity.
  • 64 hex characters.Always the same length, whatever the size of the text.

What you can do

  • Get the SHA-256 of any text, updated as you type.
  • Show the digest in capitals with "Uppercase", to match how a download page prints it.
  • Add an HMAC key to see HMAC-SHA-256 next to it.
  • Drop a downloaded file on the "File checksum" tab, paste the SHA-256 from the vendor and see "Matches" or "Doesn't match".
  • Copy the result as a sha256sum-style line from that tab.

Good to know

  • SHA-256 is fast by design, so it is the wrong tool for storing passwords. Use bcrypt or Argon2 there.
  • The text is hashed as UTF-8, exactly as typed. A space or newline at the end changes the whole hash.
  • A published SHA-256 only proves the file is intact if you got the hash from a trusted place, not the same server as the file.

Questions

What is SHA-256?

A hash function from the SHA-2 family. It turns any data into a 256-bit fingerprint, written as 64 hex characters.

How do I check a download's SHA-256?

Open the "File checksum" tab, drop the file and paste the published hash. The tool tells you if it matches.

Is SHA-256 encryption?

No. A hash cannot be turned back into the text. It only gives a fingerprint to compare.

Is SHA-256 secure?

Yes, for integrity and signatures. For passwords, add a slow hash such as bcrypt or Argon2 instead.

Related tools

How it works

Small tools that run in your browser.

Four steps

  1. Start with a file or a task

    Drop a file, search, or pick a task.

  2. The tool opens in a window

    Open as many as you like, side by side as tabs.

  3. Results collect on the right

    Drag a result into the next tool.

  4. Save when you're done

    Saved files go to your downloads.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari.
  2. Tap Share (the square with the arrow).
  3. Choose “Add to Home Screen”, then Add.

Android

  1. Open the tool in Chrome.
  2. Tap the menu (⋮) at the top right.
  3. Choose “Add to Home screen” or “Install app”.

Computer

  1. Open the tool in Chrome or Edge.
  2. Click the install icon in the address bar.
  3. Choose Install.

Skills

Claude skills we use ourselves, one job each.