Hash Generator
MD5, SHA-1, SHA-256, SHA-384, and SHA-512 — all at once, with auto-verify.
Also known as: Checksum calculator, MD5 checker, SHA-256 generator, File hash calculator
How it works
- 1Choose Text or File as your input.
- 2Type or paste text, or select a file — all five hashes compute automatically.
- 3Copy any hash you need with its dedicated copy button.
- 4To verify a checksum, paste it into the compare field — the matching algorithm is detected automatically.
Why use Hash Generator
5 algorithms, one action
MD5, SHA-1, SHA-256, SHA-384, and SHA-512 all compute together — no need to guess which one you need first.
Auto-detected verification
Paste a published checksum and the tool figures out which algorithm it is from its length, then checks it for you.
Verified MD5 implementation
MD5 isn't available in browsers' native crypto engine, so it's implemented directly here and checked against the official RFC 1321 test vectors.
Text or file input
Hash a quick string or an entire file with the same tool.
Case-insensitive matching
Verify mode compares hashes regardless of upper or lower case, since published checksums vary in convention.
Nothing uploaded
Every hash is computed locally on your device — files and text never leave your browser tab.
Who uses Hash Generator
Verifying a software download
Confirm a downloaded file matches the checksum published on the developer's site, without knowing which algorithm they used in advance.
Checking file integrity after a transfer
Compare a file's hash before and after copying it to confirm nothing was corrupted.
Generating a checksum to publish
Compute a hash for a file you're distributing so others can verify their download.
Detecting duplicate files
Compare hashes of two files to confirm whether their contents are identical, regardless of filename.
Quick data fingerprinting
Generate a short, unique fingerprint for a piece of text or configuration file for comparison later.
Legacy checksum verification
Check an older file against a published MD5 sum, common on long-standing software archives.
About Hash Generator
Checking a file's integrity or generating a checksum usually starts with a small but annoying question: which algorithm does the published hash actually use? A software download page might list an MD5 sum, a SHA-256 sum, or both, with no clear label — and most hash tools make you guess correctly before they'll even show you a result. This tool sidesteps that entirely by computing all five common algorithms at once, so whatever you're comparing against, the answer is already sitting right there.
Verify mode goes a step further: paste in a hash you got from somewhere else, and the tool detects which algorithm it's likely to be based purely on its length — 32 hex characters means MD5, 40 means SHA-1, 64 means SHA-256, 96 means SHA-384, and 128 means SHA-512 — then tells you plainly whether it matches. If a length matches more than one possibility, it checks all of them, since length alone can't fully disambiguate.
Four of the five algorithms (SHA-1 through SHA-512) run on the Web Crypto API's native, browser-implemented SubtleCrypto engine — the same cryptographic implementation your browser uses for HTTPS. MD5 is not implemented by Web Crypto at all, because it's cryptographically broken for security purposes; but it's still the most commonly published checksum for older software downloads and files, so it's implemented directly here following the original RFC 1321 specification, and verified against that RFC's own published test vectors.
Everything — reading the text or file, computing every hash, and comparing against what you paste in — happens locally on your device. Nothing you type or upload is ever sent anywhere, which matters as much for a sensitive internal document's checksum as it does for a public download.
Hash Generator vs. other options
How Open Tools Library compares to desktop software and other online tools.
| Feature | Open Tools Library | Desktop software | Other online tools |
|---|---|---|---|
| Price | Free, unlimited | Often paid or subscription | Often free with daily limits |
| Installation | None | Required | None |
| File privacy | Never leaves your device | Stays local | Uploaded to a server |
| Algorithms shown | All 5 at once | Varies by app | Usually one at a time |
| Verify convenience | Auto-detects algorithm by length | Manual selection required | Manual selection required |
| Speed | Instant, on-device | Fast | Depends on upload + server queue |
Pro tips
- If you're not sure which algorithm a published checksum uses, just paste it into the verify field — the length gives it away.
- MD5 and SHA-1 are fine for detecting accidental corruption but shouldn't be relied on for security purposes — prefer SHA-256 or higher when integrity against tampering matters.
- Hashing the same input always produces the same output — if two files hash differently, their contents differ somewhere, even if the difference is a single byte.
- For very large files, hashing happens entirely in memory on your device, so performance depends on your device rather than an upload connection.
- Hashes are one-way — this tool can verify a match but can never reconstruct the original text or file from a hash alone.
Technical specs
- Algorithms
- MD5, SHA-1, SHA-256, SHA-384, SHA-512
- Input types
- Text or any file
- MD5 engine
- RFC 1321 implementation, verified against published test vectors
- SHA engines
- Native browser Web Crypto API (SubtleCrypto)
- Verify mode
- Auto-detects algorithm from hash length
- Processing location
- 100% local, in your browser
Privacy & security
A checksum is often computed on something sensitive — an internal build artifact, a confidential document — so where the hashing happens matters.
Every hash is computed locally — your text or file is never uploaded, never seen by a server.
No account, no email, no login — just input in, hashes out.
Nothing is retained after you close the tab; there's no copy waiting on a remote server.
Equally private whether you're hashing a public download or a confidential internal file.
Frequently asked questions
Is my file or text uploaded to a server?
No. Every hash is computed entirely in your browser — nothing is ever uploaded.
Which algorithm should I use to verify a download?
Use whichever the publisher provided — this tool computes all five, so whatever they published, you already have the matching value to compare.
Is MD5 safe to use?
For basic integrity checks (confirming a file wasn't corrupted), yes. For security purposes like verifying a file hasn't been maliciously tampered with, no — MD5 is cryptographically broken and SHA-256 or higher should be used instead.
Can I hash a file and text at the same time?
Switch between Text and File mode as needed — each computes its own independent set of five hashes.
How does verify mode know which algorithm I'm checking?
It looks at the length of what you paste in hex characters — 32, 40, 64, 96, and 128 correspond uniquely (or in rare overlapping cases, to a short list) of the five supported algorithms.
Is there a file size limit?
No hard limit — very large files just take longer since everything is hashed on your own device.
Troubleshooting
The hash I'm comparing against doesn't match any length
Double-check you copied the full checksum — a truncated or extra-character paste won't match any of the five supported lengths (32, 40, 64, 96, or 128 hex characters).
My hash doesn't match even though I'm sure the file is correct
Even a single differing byte — including invisible differences like line-ending conversions in text files — produces a completely different hash. Re-download or re-copy the exact original source.
Why does MD5 take a different code path than the others?
Browsers intentionally don't implement MD5 in their native cryptography engine because it's considered broken for security purposes. It's still useful for basic integrity checks, so this tool implements it directly, verified against the algorithm's official published test vectors.
Hashing a large file feels slow
Very large files are read entirely into your device's memory before hashing, so performance depends on your device rather than a network connection — this is expected for files in the multi-gigabyte range.
Related searches
Landed here looking for something worded a little differently? Hash Generator covers all of these too:
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