Aspect Ratio Calculator

Send HyperText Transfer Protocol (HTTP) requests with custom method, headers, body, and authentication — inspect the full response.

Test any Uniform Resource Locator (URL) for Cross-Origin Resource Sharing (CORS) with a custom method, headers, and body — see exactly why a browser would allow or block the request.

Encode UTF-8 text as Base64, or decode Base64 to UTF-8 text.

Percent-encode arbitrary text for safe inclusion in URLs, or decode percent-encoded text.

Escape HTML special characters as entities (& < > "), or decode entities to plain text.

Pretty-print, minify, or sort-key JavaScript Object Notation (JSON).

Fetch a Uniform Resource Locator (URL) and inspect response headers, status code, and redirect chain.

Compute a unified diff between two blocks of text (line-based).

Break a Uniform Resource Locator (URL) into its components (scheme, host, port, path, query params, fragment) or assemble one from parts.

Test a regular expression against a string — shows all matches, captured groups, and highlights matches inline.

Translate a cron expression into next 8 scheduled run times (Coordinated Universal Time (UTC)). Supports 5-field and 6-field (with seconds) syntax.

Load a URL in headless Chromium and identify the CSS frameworks, JS frameworks, analytics, CDNs, CMS, and hosting platform used to build the site.

Convert between HEX, Red Green Blue (RGB), and Hue Saturation Lightness (HSL) color notations with a preview swatch.

Fetch a Uniform Resource Locator (URL) and preview how it appears as a Google result, Twitter card, and Open Graph share.

Fetch an image Uniform Resource Locator (URL) and convert it to a Base64 data Uniform Resource Identifier (URI) for embedding directly in Cascading Style Sheets (CSS) or HyperText Markup Language (HTML).

Load a Uniform Resource Locator (URL) in headless Chromium, extract every computed Cascading Style Sheets (CSS) color, and list them as a sortable palette with swatches.