Skip to content
Developer Tools

QR Code Generator

Generate a downloadable QR code from text, URL, or contact info — with custom foreground/background colors, an embedded logo, and adjustable error-correction level.

Adding a logo automatically switches to the highest error-correction level so the code stays scannable even with part of it covered.

Tool Interface

Size
Error Correction Level

PNG or JPG, up to 2MB. Adding a logo automatically switches error correction to High so the code stays scannable.

Using the logo from your last run.

What's this about?
Rating
Developer Tools

JSON Formatter

Format, validate, and beautify JSON.

Use Tool
Developer Tools

Base64 Encoder/Decoder

Encode or decode Base64 strings.

Use Tool
Developer Tools

UUID Generator

Generate UUID/GUID values.

Use Tool
Developer Tools

Hash Generator

Generate MD5/SHA1/SHA256/SHA512 digests.

Use Tool
Developer Tools

MD5 vs SHA-256: Which Hash Should You Actually Use?

Both will generate a hash from your input. Only one of them should be anywhere near anything security-related in 2026.

Jul 15, 2026 Read More
Developer Tools

Why Your JSON Looks Like a Mess (and How to Fix It in One Paste)

API responses and minified config files often come back as one unreadable line. Here's what's actually wrong with it and how formatting fixes it.

Jul 13, 2026 Read More
Developer Tools

What's Inside a JWT? A Plain-English Breakdown

JSON Web Tokens look like gibberish, but they're just Base64-encoded JSON with a signature stapled on. Here's what each part means and how to verify one.

Jul 11, 2026 Read More

Frequently Asked Questions

Yes — upload a PNG or JPG under 2MB in the options below. It's placed in the center, and error correction automatically switches to High so the code still scans correctly.

Yes — set a custom foreground (dot) color and background color. Keep strong contrast between the two for reliable scanning; avoid pairing two light or two dark colors.

It controls how much of the code can be damaged, dirty, or covered — like by a logo — and still scan correctly. Low recovers about 7%, Medium about 15%, Quartile about 25%, and High about 30%, at the cost of a slightly denser code.

Any text up to 1000 characters — URLs, Wi-Fi credentials, plain text, contact details, payment links, and more. The scanning device decides how to interpret it.

200-300px works well for on-screen use; choose 400px or larger for print (business cards, posters, flyers) so it still scans from a normal distance.