Hash Generator: Generate MD5, SHA-1, SHA-256 & SHA-512 Hashes Online

Someone downloads a large file and wants to confirm it matches the checksum the publisher listed, or a developer needs to verify a password hash during a migration, or someone just needs the SHA-256 of a string for a config file. In every case, the actual purpose of hashing something is to verify it, often as a security check, which makes it genuinely strange how many "hash generator" websites ask you to paste your sensitive data into a form that submits to their server first.

If you're hashing a password, an API secret, or file contents you specifically care about keeping private, sending that data anywhere before hashing it defeats the purpose of using a one-way hash function in the first place.

Why hashing should happen entirely in your browser

Hash functions like SHA-256 and MD5 are pure, deterministic computations: the same input always produces the same output, with no external data needed. That means there's zero technical reason this computation needs a server at all, your browser's Web Crypto API can compute SHA-1, SHA-256, and SHA-512 natively, and MD5 can be computed with a lightweight local implementation. Keeping it local matters most when you're hashing something sensitive, like verifying a password reset token or checking a file you haven't fully vetted yet, where you'd rather not create a second copy of that data on a server you don't control, even briefly.

How to generate a hash with ihatetools

Open the Hash Generator tool.
Choose whether you're hashing text input or a file.
Select your algorithm: MD5, SHA-1, SHA-256, or SHA-512.
Paste your text or select your file. The hash is computed immediately and displayed.
Compare the result against the expected value, for example, a checksum published alongside a software download, to confirm integrity.

For file verification, this is the entire use case: the tool reads the file locally, hashes it, and gives you a value to compare, the file itself never needs to go anywhere.

Choosing the right algorithm for the job

SHA-256: The right default for almost everything today, file integrity checks, checksums, git commit hashes, blockchain applications. It offers a strong balance of security and performance, with no known practical collision attacks.
SHA-512: Similar security profile to SHA-256 but with a larger output and often faster performance on 64-bit systems. Use it when a system specifically requires it or when you want extra margin for very long-lived security requirements.
SHA-1: Deprecated for security purposes. Practical collision attacks have been demonstrated against SHA-1, so it should not be used for anything where collision resistance matters, like certificates or security tokens. It still shows up in legacy systems (like git's internal object hashing, which is itself transitioning away from it) and for basic non-security checksums.
MD5: Broken for any security use. MD5 collisions can be generated quickly with ordinary hardware. Only use MD5 for non-adversarial purposes, like a quick checksum to catch accidental file corruption, never for passwords, signatures, or anything an attacker might want to forge.
Never hash passwords with a raw hash function for storage. Even SHA-256, run directly on a plaintext password, is vulnerable to brute-force and rainbow table attacks because it's fast and deterministic with no per-user variation. Password storage needs a purpose-built algorithm with built-in salting and deliberate slowness, like bcrypt, scrypt, or Argon2, not a general-purpose hash function like the ones in this tool.

Practical tips

When verifying a downloaded file against a published checksum, always copy the checksum directly rather than retyping it; a single mistyped character will make a valid file look corrupted.
If you need to confirm two files are identical rather than just checking one against a known value, hash both and compare the outputs, this is effectively what the Duplicate File Finder automates across many files at once.
For verifying API payloads or webhook signatures during development, SHA-256 with HMAC is the common standard; a plain hash generator covers the hashing step but check your specific integration's requirements for the full HMAC construction.
If you're encoding hash output or binary data for transport in a URL or JSON payload, the URL Encoder / Decoder and Image to Base64 tools cover related encoding needs.

FAQ

Which hash algorithm should I use by default?

SHA-256, unless a specific system or legacy requirement dictates otherwise. It's secure, fast, and universally supported.

Why shouldn't I use MD5 or SHA-1 anymore?

Both have known practical weaknesses. MD5 collisions can be generated trivially with modern hardware, and SHA-1 collisions, while more computationally expensive, have been publicly demonstrated. Neither should be relied on where collision resistance actually matters.

Can I use this tool to verify a downloaded file's integrity?

Yes. Select the file in the tool, generate its hash, and compare the result against the checksum published by the file's source (often on the download page or in a release notes file). A mismatch means the file is corrupted or was altered.

Is it safe to hash sensitive data, like a password, with this tool?

The computation itself runs entirely in your browser and nothing is transmitted anywhere. That said, remember that a plain hash is not a secure way to store passwords long-term; it's fine for quick checks, but production password storage needs a dedicated algorithm like bcrypt or Argon2.

Verify your data locally

Checking a checksum or hashing a string shouldn't require uploading that data to a stranger's server first. Open the Hash Generator on ihatetools and compute MD5, SHA-1, SHA-256, or SHA-512 hashes instantly and privately.