What is error correction and which level should I choose?

Error correction lets a QR code be read even when part of it is obscured or damaged. Level L (7%) is smallest and best for clean digital use. Level M (15%) is the common default. Level Q (25%) is good when adding a logo overlay. Level H (30%) is highest and recommended when a large logo covers the centre.

How big should my logo be?

Keep the logo under 30% of the QR code area to avoid making it unreadable. At error correction level H, a logo covering up to 30% of the centre is fine. Use a square or circular logo with a white background for best results.

Is there a character limit for the text?

QR codes can hold up to about 4,296 alphanumeric characters, but the more data you encode the denser the QR becomes and the harder it is to scan. For URLs, shorter is always better.

Is my data sent to a server?

No. All QR code generation happens in your browser using the qrcode.js library. Your text or URL is never transmitted anywhere.

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Text / URL to QR Code

Generate QR codes from text or URLs with custom colors and optional logo overlay

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关于此工具

Turn any text or URL into a downloadable QR code in seconds. Choose the output size (200–600 px), error correction level (L, M, Q, or H), and foreground/background colours. Optionally upload a small logo image to overlay in the centre of the QR code — great for branded marketing materials. Download the finished code as a PNG with one click. QR generation runs entirely in your browser using the qrcode.js library; no data is sent to any server.

使用方法

1 Type or paste your text or URL into the input field.
2 Adjust the size, error correction level, and colours as desired.
3 Optionally click 'Upload Logo' to add a centre image.
4 The QR code preview updates live — click 'Download PNG' to save it.

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