What these developer tools do
Developers and power users repeat a handful of small jobs so often that they deserve dedicated pages. The JSON formatter validates and tidies JSON so a malformed payload is easier to read and fix. The Base64 encoder and decoder converts data between plain text and Base64, which is used to carry binary data safely inside text. The QR code generator turns text or a URL into a scannable QR code image. The colour picker gives HEX, RGB and HSL values for a chosen colour. The password generator creates strong, random passwords.
These tools are built for quick, repeatable jobs: paste something in, get a readable result out, copy it onward. Password generation uses the browser's cryptographic random source, and, like the rest of the site, these tools do not require an account.
Choosing the right developer tool
If your JSON will not parse, format it first: indentation makes the broken bracket or missing comma visible in a way that a single-line string never will. If data needs to travel inside text — for example inside a URL, a configuration value or an API field — Base64 encoding is the right step, but remember it is encoding, not encryption: anyone can decode it, so never use it to hide a secret. If you need a link to work offline on paper, a poster or packaging, a QR code is the right bridge, and you should test-scan it on a real phone before printing it. If you are picking a colour, copy the value in the format your code actually uses, and check contrast against its background before you ship it.
Common mistakes to avoid
The most common JSON mistake is editing the formatted output and pasting it back without re-validating — format again after every edit. With Base64, the common mistake is treating encoded text as protected: it is not. With QR codes, the common mistakes are encoding a URL that later changes, and printing a code too small or too low-contrast to scan reliably. With passwords, the common mistake is reusing a strong password across sites: a password is only strong if it is also unique, so generate a fresh one per account and store it in a password manager.
Frequently asked questions
Are these developer tools free?
Yes. All 34 developer tools are free and do not require an account.
Is Base64 encoding the same as encryption?
No. Base64 is an encoding, not encryption. Anyone can decode Base64 text, so never use it to protect a secret.
Are generated passwords stored anywhere?
The password generator is designed to run in your browser. Daily Tools is not designed to receive or store generated passwords.
Will my QR code still work if I change the URL later?
No. A QR code encodes the URL you gave it at creation time, so generate a new code if the destination changes.
Related guides
Read how to create a strong password you can actually remember, how QR codes work, what URL encoding means and how barcodes work and how to check an SEO title and meta description on the Daily Tools blog.