URL Validator
URL Validator. Free, no signup, no watermark. Runs in your browser — your file never leaves your device.
How to url validator
- Add your input — Paste or type into the box above. There is no length limit, because the work happens on your own machine rather than in a request to a server.
- Adjust the options — Where the tool offers settings, change them and the output updates immediately — there is nothing to submit.
- Copy the result — Use the copy button, or select the output and copy it by hand. Nothing is stored once you leave the page.
What this tool does
To use the URL validator, add your file to the tool above and the result is ready to download in a moment. Everything runs in your browser, so nothing is uploaded. The tool is free, needs no account, applies no watermark, and has no daily limit.
What this tool does
A developer utility should be instant, correct, and unremarkable. This one runs in the browser using the platform's own primitives rather than a hand-rolled implementation, which means the results match what your language's standard library will produce — and there is no round trip to wait for.
Why nothing is uploaded
This tool runs entirely on your own device. Your file is read into memory by JavaScript on this page, processed there, and handed back to you as a download. It is never transmitted to us, which means there is nothing on our side to store, log, leak or forget to delete.
You can verify that yourself: load this page, disconnect from the internet, and the tool still works. That is a different claim from a privacy policy promising prompt deletion, and it is the reason this site exists.
How this is generated
Anything random here comes from crypto.getRandomValues, the
browser's cryptographically secure generator, not from Math.random.
That distinction is the entire point of a generator tool: a password or a token
drawn from a predictable pseudo-random source is worse than one a person picked,
because it looks strong while being trivially reproducible by anyone who can
work out the seed.
Where a value is drawn from a character set, the selection uses rejection sampling rather than taking a random byte modulo the alphabet size. The modulo approach biases the earlier characters of the alphabet, which measurably reduces the real entropy of the result — a subtle flaw, and a common one.
Nothing generated here is transmitted or logged. The values exist only in your browser until you copy them, which is what makes it safe to generate a production credential on a web page at all.
What it costs
Nothing. There is no account, no email capture, no free-trial countdown, no watermark on the output and no daily limit. The site is funded by advertising, which sits below the tool and never between an input and its result.
Works offline
Because everything runs locally, this tool keeps working once the page has loaded even if your connection drops. That is worth knowing on a train, on conference WiFi, or anywhere the network is unreliable — and it is the clearest demonstration that your file really is not going anywhere.