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Free Online Developer Tools

Everyday utilities for developers: formatters, encoders, generators and converters you would otherwise search for one at a time.

Everything runs client side in your browser, so tokens, payloads and config you paste in are not sent anywhere.

20 live tools4 in developmentAll free, all private

Ready to use

Aspect Ratio Calculator

Find the aspect ratio of any size and work out new dimensions that keep the same proportions.

Base64 Encoder and Decoder

Encode and decode Base64 text with UTF-8 support, and turn files or images into data URLs.

Color Converter

Convert colors between HEX, RGB, HSL, HSV and OKLCH, with a picker and contrast check.

Color Palette Generator

Build shade scales and harmonious palettes from one color, then export them as CSS or Tailwind.

Contrast Checker

Check text and background colors against WCAG AA and AAA, and get passing color suggestions.

CSS Gradient Generator

Design linear, radial and conic gradients with a live preview and copy the CSS.

CSS Tooltip Generator

Design pure CSS tooltips with a live preview, then copy lightweight HTML and CSS.

Device Screen Sizes

Viewport sizes, pixel ratios and exact aspect ratios for phones, tablets, laptops and monitors, from 320px up.

Favicon Generator

Turn an image, letters or an emoji into a complete favicon and app icon set.

HTML Viewer

Paste or write HTML and CSS and see a live preview as you type, at any screen width.

JSON Formatter

Format, minify and validate JSON, with clear error positions and optional key sorting.

Lorem Ipsum Generator

Generate placeholder text by paragraphs, sentences or words for mockups and layouts.

Password Generator

Create strong random passwords with custom length and character sets, generated securely on your device.

PX to REM Converter

Convert px to rem and back, with a conversion table and whole-stylesheet conversion.

Text Case Converter

Change text to uppercase, lowercase, title case, sentence case, camelCase, snake_case and more.

Text Compare

Compare two versions of a text and highlight what was added or removed.

Unix Timestamp Converter

Convert Unix timestamps to readable dates and back, with the current epoch time live.

URL Encoder and Decoder

Percent-encode or decode URLs and query values, and see any link split into its parts.

UUID Generator

Generate random v4 or time-ordered v7 UUIDs in bulk, with formatting options.

What Is My Screen Size

Instantly see your screen resolution, browser viewport, pixel ratio and aspect ratio, updated live.

On the roadmap

Coming soon

Free, private and in your browser, like everything else here.

In development

Hash Generator

Create SHA-256, SHA-1 and MD5 hashes of text and files.

Want it sooner? Let us know
In development

JWT Decoder

Decode a JSON Web Token header and payload locally.

Want it sooner? Let us know
In development

Markdown Editor

Write Markdown with a live preview and export to HTML.

Want it sooner? Let us know
In development

Regex Tester

Test regular expressions with live match highlighting.

Want it sooner? Let us know

Software Developers: common questions

Is it safe to paste API keys or tokens here?

The tools process data in your browser and do not send it to a server. As a general habit, still avoid pasting live production secrets into any web page.

Do the tools work offline?

Once a tool page has loaded, most tools keep working without a connection because all the logic runs on your device.