Regex Tester
Test a regular expression against a string — highlights all matches and shows captured groups.
Dev Tools
-
HTTP Request Builder
Send any HTTP method with custom headers and body; inspect the full response.
-
Base64
Encode UTF-8 text as Base64, or decode Base64 to UTF-8 text.
-
URL Encoder
Percent-encode arbitrary text for safe inclusion in URLs, or decode percent-encoded text.
-
HTML Entities
Escape HTML special characters as entities (& < > "), or decode entities to plain text.
-
JSON Formatter
Pretty-print, minify, or sort-key JSON.
-
HTTP Headers
Fetch a URL and inspect response headers, status code, and redirect chain.
-
Text Diff
Compute a unified diff between two blocks of text (line-based).
-
CORS Tester
Send a CORS preflight + GET to a URL and inspect Access-Control-* headers; flags common misconfigurations.
-
URL Parser / Builder
Break a URL into its components (scheme, host, port, path, query params, fragment) or assemble one from parts.
-
Regex Tester
Test a regular expression against a string — shows all matches, captured groups, and highlights matches inline.
-
Cron Expression Parser
Translate a cron expression into next 8 scheduled run times (UTC). Supports 5-field and 6-field (with seconds) syntax.
Designer Tools
-
Color Converter
Convert between HEX, RGB, and HSL color notations with a preview swatch.
-
Meta Tag Preview
Fetch a URL and preview how it appears as a Google result, Twitter card, and Open Graph share.
-
Aspect Ratio Calculator
Given width, height, or a W:H ratio, calculate the missing dimension and show the simplified ratio.
-
Image to Base64
Fetch an image URL and convert it to a Base64 data URI for embedding directly in CSS or HTML.
-
Site Color Palette
Load a URL in headless Chromium, extract every computed CSS color, and list them as a sortable palette with swatches.
-
Tech Stack Detector
Load a URL in headless Chromium and identify the CSS frameworks, JS frameworks, analytics, CDNs, CMS, and hosting platform used to build the site.