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Developer Tools

Free Developer Tools

Format JSON, check diffs, generate hashes, create QR codes, and more. Free browser-based developer tools, no install needed.

11 tools, all free, no sign-up

Dynamic QR Code Generator

Create editable QR codes and change the destination anytime without reprinting. Track scans. Free, no sign-up.

GeneratorDeveloperQR Code

QR Code Generator

Generate QR codes for URLs or text instantly. Free, no sign-up, runs in your browser.

GeneratorDeveloperQR Code

WiFi QR Code Generator

Make a QR code guests scan to join your WiFi in one tap. WPA/WEP/open. Free, no sign-up.

GeneratorDeveloperQR Code

vCard QR Code Generator

Turn your contact details into a QR code people scan to save you instantly. Free, no sign-up.

GeneratorDeveloperQR Code

Website Change Monitor

See the exact text a change monitor would watch on any page, and whether it renders with JavaScript. Free, no sign-up.

NetworkDeveloperProductivity

Color Hex Generator

Generate random hex colors with RGB and HSL conversions. Create color palettes for design projects.

GeneratorDesignDeveloper

JSON Formatter

Format, minify, and validate JSON instantly in your browser. No sign-up, no data sent to servers.

DeveloperText

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text instantly. UTF-8 safe, URL-safe option, fully client-side.

DeveloperText

Text Diff Checker

Compare two texts side by side and highlight added, removed, and unchanged lines. Works with code, JSON, and prose.

TextDeveloper

Text Joiner

Join lines into SQL IN clauses, CSV, quoted strings, or any custom delimited format. Paste, configure, copy.

TextDeveloper

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly. Hash text or files client-side with HMAC support. No data sent to servers.

DeveloperSecurity
Developer tools handle small, frequent tasks that don't justify opening an IDE or installing a package: formatting JSON, encoding Base64, diffing two blocks of text, generating a hash or QR code. They are used by developers debugging an API response, writing documentation, or generating a one-off hash for a test fixture. A concrete example: someone pastes a minified JSON API response into a formatter to actually read the structure, instead of eyeballing one unbroken line or writing a throwaway script to pretty-print it. Everything here runs client-side in the browser, so pasted code or data is not sent to a server, which matters when the input comes from an internal system.

Frequently Asked Questions

When should I use Base64 instead of the Hash Generator?▾
Base64 is reversible encoding, use it when you need to turn binary-ish data into text and decode it back later. A hash is one-way and used to verify integrity or fingerprint data, not to encode something you'll need to recover.
Does the JSON Formatter validate my JSON, or just format it?▾
Both. It formats and minifies valid JSON and flags syntax errors if the input isn't valid JSON.
Is code or data I paste into these tools sent to a server?▾
No. JSON formatting, Base64 encoding, diffing, and hashing all run client-side in the browser.
Are these Developer Tools tools free to use?▾
Yes, all 11 tools in this category are completely free. No sign-up, no account, and no payment required. Every tool works instantly in your browser.
Do these tools work on mobile phones?▾
Yes. All tools are mobile-responsive and work on iOS, Android, and desktop browsers. Touch events are supported where applicable.
Is my data sent to a server?▾
It depends on the tool, so each tool page says which it is. Most run entirely in your browser and send nothing. Some fetch public data to work, such as price charts and currency rates. A few, like the dynamic QR generator, need an account and store what you create, because that is the feature.
How many Developer Tools tools are available?▾
There are 11 tools in this category. All are free and require no sign-up. Browse the list above to find the tool you need.