Hash Identifier — Detect Hash Type
Identify the type of a hash string by analyzing its format and length.
How it works
- 1Paste or type your text in the input field
- 2Click "Process" — processing happens in your browser
- 3Copy the result or download as a text file
What to do next
About Hash Identifier
Hash Identifier is a free, in-browser developer tool. Identify the type of a hash string by analyzing its format and length. The page exposes a small surface — input, controls, output — so a first-time visitor can complete the job without reading documentation.
The heaviest users of Hash Identifier tend to be QA engineers writing repro cases, devops engineers crafting one-liners and frontend developers prepping fixtures. Each group brings slightly different expectations to the tool, but the same single-page architecture serves every one of them with the same response time.
Hash Identifier runs the entire transformation inside your browser. The file is read by JavaScript running in the page, processed in-memory by standard browser APIs, and written back as a download. The browser is the runtime; the page is the interface. You can confirm what the tool does by opening the developer-tools Network tab during a run — the only requests are for the page's own static assets.
From a technical standpoint, Hash Identifier is JavaScript and standard browser APIs running in your tab. The browser is the runtime; the page is the interface. Maximum input size: 0 MB per run.
Reach for Hash Identifier when you need a predictable result on a single file. The page works on the first visit, the controls are visible without a menu, and the output is delivered the moment the engine finishes.
Hash Identifier sits in a small group of related tools. Useful neighbours include Bcrypt Format Verifier, SHA-384 Hash Generator, Text Checksum, and File Hash Calculator. They are designed to compose: the output of one is a sensible input to the next, so a multi-step task is usually a sequence of single-click operations.
Hash Identifier returns the result as a download. If you are running multiple jobs, the output names will not collide as long as the input names differ. You can re-run with different settings as many times as you like; each run produces a fresh file with no caching trickery in between.
A practical note on limits: Hash Identifier accepts inputs up to 0 MB per run, and the tool processes one input at a time to keep memory usage predictable. If you ever bump into the ceiling, the cause is the size of the input.
Some notes on the design of Hash Identifier. The page is intentionally narrow: one input, the controls relevant to the task, and one output. Adding unrelated features would make the common case slower for the majority of users, so the surface is held to what people actually use.
Some background on the design choices behind Hash Identifier: every option you see on the page is there because a real workflow needs it, and every option that is not shown has been deliberately omitted to keep the common case fast. The bias is toward minimal-but-complete.
If you want to get the most out of Hash Identifier, three small habits help. Drag-and-drop is faster than the file picker once you get used to it. The keyboard shortcut for downloading the result is whatever your browser uses for "save link as," because the result is a normal download. And if you are working on a sensitive file, processing in an Incognito or Private window is a good extra layer — it leaves no trace in browser history when the tab closes.
Common gotchas worth flagging: the supported formats are listed in the upload area. The 0 MB ceiling is per-file, not per-session; you can run as many separate jobs as you like, but a single oversized input will be rejected on load.
As a single-page tool, Hash Identifier stays focused on one developer utility step. Multi-step workflows are composed by chaining adjacent tools — each tool produces a standard file the next one can read directly, so a longer pipeline is just a sequence of short tab-and-tab visits.
Hash Identifier is intentionally narrow in scope so the common case is fast and the result is predictable. If you ever need a variation it does not cover, browse the rest of the catalog — there is a good chance an adjacent tool already exists, and switching between tools is just a matter of opening another tab.
How it works
- 1Open the Hash Identifier workspace above. The interface is a single page, so there is nothing to navigate.
- 2Drop a developer file onto the upload area, or click to pick one from your device.
- 3Pick any non-default settings you need. Most users leave the defaults alone for the first run and only revisit if the result needs tuning.
- 4Hit the run button. standard browser APIs does the work in your browser tab.
- 5Grab the output as soon as the run completes. You can also copy the result instead of downloading if the next tool in your workflow accepts pasted input.
- 6Re-run with different settings as often as you want. Each run produces a fresh output and the original file on disk is never modified.
Common use cases
- Generate a quick fixture without leaving the browser using Hash Identifier.
- Generate boilerplate from a single specification line.
- Pretty-print a minified blob during incident triage.
- Decode a token to confirm its claims during a debugging session.
- Validate a config blob before pushing to staging.
- Convert between data formats while wiring up an integration.
- Inspect a payload during local development without writing a script.
- Format a noisy log line into something a teammate can read.
- Compare two API responses to spot a regression.
- Hash a string for a quick reproducibility check.
FAQ
How are hashes identified?
By length, character set, and format prefixes matching known hash algorithm patterns.
Can it distinguish MD5 from CRC?
Not always — 32 hex chars could be MD5 or other 128-bit hashes. Results show all possibilities.
Does it identify bcrypt and Argon2?
Yes — prefix-based formats like $2b$ and $argon2 are recognized.
What about base64-encoded hashes?
Common base64 hash lengths (44 chars for SHA-256, 88 for SHA-512) are detected.
Is it 100% accurate?
No — multiple algorithms can produce the same length output. Results are best guesses.
Is data sent to a server?
No — processing happens in your browser.
Can I use Hash Identifier with formats other than the defaults?
The accepted formats are listed in the upload area on the tool itself. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.
Is there a desktop version of Hash Identifier?
No installation is needed. Hash Identifier runs as a normal web page, with no browser extension, no native helper, and no separate desktop client to download. That is partly a privacy choice — extensions can request broad permissions, while a regular page is sandboxed by default — and partly a convenience one: you can use Hash Identifier on any computer you have temporary access to without leaving anything installed on it.
How long does Favtoo retain my data after using Hash Identifier?
Favtoo keeps no copy of your file because Favtoo never receives your file. Hash Identifier runs entirely in your browser, the input is held only in your tab's memory, and closing the tab discards it. There is no opt-in cloud history, no "recent jobs" panel synced to an account, and no server-side retention to configure — the architecture simply has nowhere for your file to be stored.
Can I call Hash Identifier from a script?
Hash Identifier is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (standard browser APIs) is open-source and can be used directly from your own code.
Does Hash Identifier need an internet connection to run?
Once the page is loaded, Hash Identifier can complete jobs without an active internet connection — the engine is bundled with the page, so there is no per-job network call. The initial page load does require a connection (to fetch the static assets), but after that you can disconnect entirely and the tool will still work. This is a side-effect of the local-first architecture, not a deliberate "offline mode" feature.
Is Hash Identifier mobile-friendly?
Hash Identifier runs in any modern mobile browser — Safari, Chrome, Firefox and the in-app browsers in most messaging apps all support the underlying APIs. Performance depends on the device: a recent phone handles typical inputs nearly as fast as a laptop, while older devices may take a few seconds longer near the 0 MB ceiling. The interface lays out cleanly on small screens, so you do not need to pinch-zoom to see the controls.
Why is my browser prompting me when I open Hash Identifier?
Hash Identifier only needs the standard web platform — file picker access for the inputs you choose to load, and optionally clipboard access if you copy the result rather than downloading it. There is no microphone, camera, geolocation or background-permission request, because none of those are needed for the work the tool does.
Is Hash Identifier keyboard accessible?
Hash Identifier uses native HTML controls wherever possible, which means keyboard navigation, focus rings, and screen-reader labels work the way the platform expects. The drop zone accepts files via the keyboard-accessible file picker as well as drag-and-drop, and result downloads use standard browser download flows. If you spot an accessibility gap, Favtoo treats it as a bug worth fixing.