UUID / 비밀번호 / QR 코드 생성기

A handful of generators you want within reach: UUIDs, random passwords, QR codes, placeholder text, number sequences and random test data. Configure the parameters on the left and generate on the right.

UUIDs and passwords come from the browser cryptographic random source, and nothing is routed through a server.

Features

UUID — Generates UUID v4 values, one or many at a time, with per-item copy or copy-all support.
Random Passwords — Set the length and character set, toggling uppercase, lowercase, digits and symbols independently.
QR Codes — Turn text or a URL into a QR code, adjust the size and colours, and download it as a PNG.
Lorem Ipsum — Generate placeholder text by paragraph, sentence or word count for layout previews.
Number Sequences — Produce arithmetic sequences with a chosen start, end and step, or random numbers within a range.
Random Test Data — Bulk-generate names, email addresses, phone numbers, addresses and ID numbers for testing.

How to use

Choose the generator you want on the right: UUID, random password, QR code and so on.
Adjust length, character set and quantity in the parameter panel on the left.
Click Generate to produce the results.
Use Copy to take the output, or download a QR code directly as a PNG.

FAQ

Can UUID v4 values collide?

A UUID v4 carries 122 random bits, so collisions are theoretically possible but astronomically unlikely: generating a billion of them every second for about 100 years still leaves a collision probability far below the chance of a hardware failure. In practice you can treat them as unique.

Are the generated passwords really random?

Yes. They come from the browser crypto.getRandomValues() cryptographic random number generator rather than Math.random(), so there is no predictable pseudo-random sequence. Store the result somewhere trustworthy — this page keeps no record of it.

Can the generated test data be used in production?

No. Fields such as phone and ID numbers are fabricated to match a format and suit only testing and demos. They are not real, and may coincidentally match a real person.

Are there restrictions on using the QR codes?

The QR code format is an open standard and free to use. Do make sure the URL or content you encode is lawful — the code is only a carrier and does not change who is responsible for what it contains.