Developer tools
Formatters, encoders, hash generators and other utilities for developers.
34 tools in this category
JSON Formatter
Beautify, validate or minify JSON in your browser — with clear error messages. Nothing is uploaded.
Developer tools
Base64 Encoder and Decoder
Encode text to Base64 or decode it back, UTF-8 safe and URL-safe tolerant. Runs entirely in your browser.
Developer tools
JSON to CSV Converter
Convert a JSON array of objects into CSV, right in your browser. Choose the delimiter; nested values are kept as JSON.
Developer tools
CSV to JSON Converter
Convert CSV to JSON in your browser. Header-to-keys, custom delimiter and optional number/boolean parsing.
Developer tools
Regex Tester
Test a JavaScript regular expression against text and see every match, with numbered and named capture groups.
Developer tools
URL Encoder and Decoder
Percent-encode text for URLs or decode it back, with component and full-URL modes. Runs in your browser.
Developer tools
Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text in your browser using the Web Crypto API.
Developer tools
JWT Decoder
Decode a JWT to read its header and payload, with expiry and issued-at shown as dates. Local only — no signature verification.
Developer tools
Color Converter
Convert colors between HEX, RGB and HSL, with alpha support and a live swatch. Runs in your browser.
Developer tools
HTML Entity Encoder and Decoder
Encode text to HTML entities or decode named, decimal and hex entities back to characters. In your browser.
Developer tools
Password Strength Checker
Test how strong a password is in your browser — see its entropy, estimated crack time and what to improve. Nothing is typed anywhere but your device.
Developer tools
UUID Generator
Generate random version-4 UUIDs in bulk, with uppercase, braces and no-hyphen options. Cryptographically random, in your browser.
Developer tools
CSS Minifier
Minify CSS in your browser — strip comments and whitespace to shrink the file, with a before/after size comparison. Nothing is uploaded.
Developer tools
URL Parser
Break any URL into protocol, host, port, path, query and hash, and list its decoded query parameters. In your browser.
Developer tools
Cron Expression Explainer
Turn a cron expression into a plain-language schedule, with a per-field breakdown. Supports steps, ranges and macros.
Developer tools
JSON to XML Converter
Convert JSON to indented XML in your browser — objects become nested elements, arrays repeat, a custom root name is supported. Nothing is uploaded.
Developer tools
Markdown to HTML Converter
Convert Markdown to clean HTML with a live preview — headings, lists, tables, code and links, all escaped safely.
Developer tools
Query String Parser
Parse a query string or URL into decoded key/value pairs and JSON. Repeated keys become arrays. In your browser.
Developer tools
HTML Minifier
Minify HTML in your browser — remove comments and collapse whitespace while protecting pre, script and style. Nothing is uploaded.
Developer tools
HTTP Status Code Lookup
Look up any HTTP status code — 200, 301, 404, 500 and more — with a plain-language explanation. Searchable.
Developer tools
UTM Builder
Add UTM tracking parameters to any link so your analytics can tell where campaign traffic comes from.
Developer tools
Aspect Ratio Calculator
Find the simplified aspect ratio of any width and height, and resize while keeping that ratio. Runs in your browser.
Developer tools
Color Contrast Checker
Check the WCAG contrast ratio between a text and background colour, with AA and AAA pass or fail.
Developer tools
HMAC Generator
Generate an HMAC (keyed hash) of text with a secret key using SHA-1, SHA-256, SHA-384 or SHA-512 — all in your browser.
Developer tools
IP Subnet Calculator
Calculate the network, broadcast, host range, mask and host count for any IPv4 address and CIDR prefix.
Developer tools
Meta Tag Generator
Generate SEO, Open Graph and Twitter meta tags for your page — copy the HTML straight into your <head>.
Developer tools
PX to REM Converter
Convert between px and rem for any root font size, with a quick reference table. For CSS work.
Developer tools
Regex Escape
Escape special regex characters in any text so it matches literally inside a regular expression. Runs in your browser — nothing is uploaded.
Developer tools
Text to Binary Converter
Convert text to binary (UTF-8, 8-bit groups) and decode binary back to text, right in your browser.
Developer tools
Unix Permissions Calculator
Convert Unix file permissions between octal (755) and symbolic (rwxr-xr-x), with setuid, setgid and sticky bits.
Developer tools
MIME Type Lookup
Look up the MIME type (Content-Type) for a file extension, or find the extension for a MIME type.
Developer tools
Nano ID Generator
Generate secure, URL-friendly Nano IDs in bulk, with a custom length and alphabet. Uses your browser’s CSPRNG.
Developer tools
CSS Box Shadow Generator
Build a CSS box-shadow with sliders and copy the code, with a live preview.
Developer tools
CSS Gradient Generator
Build linear and radial CSS gradients with a live preview and copy the code.
Developer tools