What error correction level should I use?

M (15%) for screens and clean prints, Q or H when the code may be scratched, partially covered or carries a logo. Adding a logo switches to H automatically because the logo consumes part of the redundancy.

Does this work for Wi-Fi QR codes?

Yes. Pick the Wi-Fi type, enter the SSID, encryption and password, and the tool writes the `WIFI:T:WPA;S:…;P:…;;` payload with proper escaping. Phones join the network when scanned.

Why does my colourful code not scan?

Scanners need dark modules on a light background with at least about 3:1 contrast, and many refuse inverted (light-on-dark) codes. The contrast readout and warnings flag both problems; transparent backgrounds only scan on light surfaces.

How big should I print it?

As a rule of thumb, at least 2 cm for a version-1–5 code at arm’s length, and about 0.5 mm per module for denser codes. Export at 300 DPI (or SVG) for print; the options panel shows the resulting physical width.

QR Code Generator

Build scannable QR codes from real forms instead of raw strings: URL, text, Wi-Fi (SSID, encryption, hidden), vCard 3.0 and meCard contacts, SMS, mailto with subject and body, phone, geo location, calendar events (VEVENT), WhatsApp, TOTP two-factor setup (otpauth) and cryptocurrency payment URIs. Style the code with square, rounded or dot modules, gradient foreground, transparent background and a centred logo (error correction is raised automatically). Export PNG at 1–4× with DPI metadata, copy PNG to the clipboard, download SVG, or batch-generate one code per line. Readouts show version, capacity used and a contrast check.

Runs locally in your browser

URL details

URL

Encoded payload

Fill in the fields above…

Preview

Payload

0 B

Version

—

Capacity used

Error correction

Contrast

17.7:1

Size (px)320

Quiet zone (modules)2

Error correction

Module style

Foreground

Background

Transparent background

Gradient foreground

Logo overlay

Logo size (% of width)22

PNG export scale

PNG DPI metadata

At 300 DPI a 320px export prints 2.7 cm wide. SVG scales to any size.

URL Parser & Query Editor

Break any URL into parts, edit query params live, unwrap nested redirect URLs, decode ad macros, build UTMs and follow redirects.

URL Encode / Decode

Percent-encode text with encodeURIComponent, encodeURI, form or RFC 3986 rules, decode multi-layer strings, and edit query strings in a table.

Image Converter & Base64

Convert, resize and compress images to PNG, JPEG, WebP or AVIF and encode or decode Base64 data URIs.

How to use QR Code Generator

1Choose a content type and fill in the form — the encoded payload updates live.
2Adjust size, quiet zone, error correction, module style, colours and optional logo.
3Check the version/capacity readout and contrast warning, then scan the preview with your phone.
4Copy the PNG, download PNG (1–4×, DPI tagged) or SVG, or use Batch for one code per line.

About QR Code Generator

QR Code Generator is part of FizzKit — a collection of focused developer and ad-tech tools. Because everything runs locally, it works offline once loaded and never exposes your data to a remote server.

Frequently asked questions

A version-40 code holds up to 2,953 bytes at error-correction L, 2,331 at M, 1,663 at Q and 1,273 at H. Anything above version 25 gets dense and needs to be printed larger; the tool warns you and shows capacity used.

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