Developer tools

Fast developer utilities that run in your browser: formatters, validators, and converters.

Free developer tools and online dev utilities remove friction from daily coding tasks. Formatters, encoders, validators, and generators all execute in your browser, which means API keys, logs, and source snippets never leave your machine.

Reach for the JSON Formatter when you need readable output and instant validation, the Base64 Encoder for safe transport of text or binary data, and the URL Encoder when building query strings or cleaning links. The Regex Tester and Slug Generator speed up pattern work and content cleanup.

More utilities handle JWT decoding, SQL and CSS minification, hash generation, cron explanation, and query string parsing. The tools stay fast on large inputs because processing is client side, and every result includes a one-click copy button so you can paste straight back into your editor.

JSON FormatterFormat, validate, and beautify JSON in your browser. Paste messy JSON, get clean indented output, then copy it back. Free, no signup.
Base64 EncoderEncode text to Base64 or decode Base64 back to text in your browser. Full UTF-8 support and clear errors on invalid input.
URL EncoderPercent encode and decode text for URLs in your browser. Toggle direction, copy results, and see clear errors on malformed input.
HTML Entity EncoderEncode special characters to HTML entities or decode them back. Handles ampersand, less than, greater than, and quotes with a direction toggle.
UUID GeneratorGenerate random version 4 UUIDs in your browser. Pick how many (1 to 100) and copy them in one click. Fast, private, no signup.
Color ConverterPaste any color in hex, rgb, hsl, hwb, oklch, or a CSS name and get every other format at once, each with its own copy button.
JSON to CSV ConverterConvert a JSON array of flat objects into clean CSV in your browser. Header row from all keys, with safe quoting for commas, quotes, and line breaks.
Unix Timestamp ConverterConvert a Unix timestamp to a readable UTC date and back. Handles seconds and milliseconds, validates input, and runs fully in your browser.
JWT DecoderDecode a JWT in your browser. See the header, payload, and signature, with the standard claims flagged and an expired indicator. Nothing leaves your device.
Hash GeneratorGenerate SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text in your browser. Fast, private, and copy ready.
CSV to JSON ConverterConvert CSV text to a JSON array of objects in your browser. Uses the first row as keys and handles quoted fields, commas, and line breaks.
Number Base ConverterConvert integers between binary, octal, decimal, and hexadecimal. Pick a source base, enter a value, see the other three. Handles large numbers.
Regex TesterTest a regular expression against sample text in your browser. See every match, its index, capture groups, and the total count.
Query String ParserParse a URL query string into key and value pairs, or build one from pairs. Handles a leading question mark, repeated keys, and encoded values.
Color Contrast CheckerCheck the WCAG contrast ratio between two hex colors and see if they pass AA and AAA for normal and large text.
Password GeneratorGenerate a strong random password in your browser. Choose the length and mix of lowercase, uppercase, digits, and symbols. Nothing is stored.
SQL FormatterFormat and indent SQL queries online. Put SELECT, FROM, WHERE, and JOIN on their own lines, set keyword case, and copy clean results.
XML FormatterPretty print XML with clean indentation per nesting level. Pick 2 spaces, 4 spaces, or tabs. Validates broken markup, runs in your browser.
CSS MinifierMinify CSS online. Strip comments and whitespace, collapse spaces, and shrink stylesheets while keeping strings and url() values intact.
HTML MinifierMinify HTML in your browser. Remove comments and collapse whitespace while keeping pre, textarea, script, and style content intact.
Cron Expression Builder and ExplainerBuild a cron expression with dropdowns, or paste one to get a plain English explanation and the next 5 run times. Supports 5 and 6 field cron.
Diff CheckerCompare two blocks of text and see what changed, line by line or word by word. Side by side, inline, or unified diff views. Free and private in your browser.
String EscaperEscape and unescape strings for JSON and JavaScript. Convert newlines, tabs, quotes, and backslashes to and from their escaped forms in your browser.
ASCII ConverterConvert text to ASCII or Unicode code points and back. Encode characters to decimal numbers or decode numbers to text in your browser.
Box Shadow GeneratorDesign CSS box shadows with live preview. Adjust offset, blur, spread, color, and opacity, stack multiple layers, then copy the rule.
CSS Gradient GeneratorBuild linear, radial, and conic CSS gradients with a live preview. Adjust angle, stops, and colors, then copy the background rule.
QR Code GeneratorCreate a QR code for a URL, text, WiFi, vCard, email, or phone number. Pick the error correction level, then download a PNG or SVG. Free and private.
AI Token CounterEstimate how many tokens your text uses for GPT, Claude, Llama, and Gemini, with character and word counts and an approximate cost per model.
CSV to JSON ConverterConvert CSV to JSON and JSON to CSV in your browser. Configurable delimiter and quote, optional header row, and type inference. Nothing uploaded.
YAML to JSON ConverterConvert YAML to JSON and JSON to YAML in your browser. Auto detects the format, with formatted output, type aware parsing, and clear errors.