QR Code Generator二维码生成器

A QR code is not a picture of a link — it is the link itself, written out in black and white squares. Nothing needs to be looked up, which is why a well-made code still works twenty years later with no server involved.

Static codes, and why that matters

There are two kinds of QR code, and most free generators do not tell you which one you are getting.

• Static — your content is encoded directly into the pattern. It works forever, offline, with no account and no third party. It cannot be edited after printing, and nobody can count the scans. This tool makes static codes.
• Dynamic — the code actually contains a short link on someone else's domain, which redirects to your content. Handy if you need to change the destination later, but that redirect is now a dependency: if the service shuts down, changes its pricing, or lets the domain lapse, every code you printed becomes dead paper. Plenty of businesses have reprinted a whole menu run for exactly this reason.

If your destination will never change — your website, your WhatsApp, your Google review page — static is simply the safer choice.

Choosing the error correction level

Reed-Solomon error correction lets a damaged code still be read. Four levels are defined, and the trade-off is real: more recovery capacity means more data to store, which means a denser grid.

Level H is not automatically better. At the same printed size a level H code has smaller modules, so a cheap camera may struggle with it more than a level M code would. Use H when you genuinely expect damage or are covering part of the code — otherwise M or Q.

The quiet zone is not decoration

The standard requires four empty modules of margin on every side. This blank border is how a scanner works out where the code starts and how big one module is. Codes fail far more often from a missing quiet zone than from anything else — particularly when someone crops the image tight or places it flush against a coloured background.

Size it for the scanning distance

The working rule is 10:1. Divide the distance a phone will be held from the code by ten, and that is your minimum width. A code on a table tent read from 30 cm needs about 3 cm. A code on a shop window read from 2 metres needs about 20 cm. For print, keep each individual module at roughly 0.4 mm or larger, and always use the SVG so nothing gets soft at the edges.

Colour rules

Dark dots on a light background, always. Inverted codes — light dots on dark — are technically permitted by the standard but a large share of phone cameras will not read them. Keep the contrast ratio above 7:1, avoid gradients across the finder patterns in the corners, and never put a code on a busy photo.

Non-English text

Chinese, Malay accents, emoji and anything else outside plain ASCII are encoded as UTF-8 in byte mode, which every modern phone camera handles. Note that non-ASCII characters use two to four bytes each, so a Chinese sentence fills a code considerably faster than the same sentence in English.

Nothing leaves your browser

The entire encoder — Reed-Solomon error correction, mask selection, the lot — is implemented in the JavaScript on this page. There is no upload, no API call and no logging. If you disconnect from the internet after the page loads, it keeps working. That matters when the code contains a Wi-Fi password or a private link.

This is not a DuitNow QR

A DuitNow QR that accepts payments is issued by your bank or payment provider and carries your registered merchant details in a specific PayNet format. You cannot create a valid one here, or anywhere else outside your bank. If someone offers to generate a payment QR for you, treat it as a scam.