Developer Tools

Serialize forms on the active page to JSON and copy or download the data. Pro saves snippets, extra format options, and ExtHub sync.

Format, minify, and validate JSON locally with path lookup. Pro saves snippets, extra format options, and ExtHub sync.

Inspect CSS media queries on the page — match state, viewport, prefers-*, breakpoints, and export. Pro saves reports, export, and...

Trace redirect chains with hop timing, host/scheme change alerts, history, and JSON export. Pro saves snippets, extra format opti...

Local HTTP client with headers, auth, presets, timing, JSON pretty-print, and cURL export. Pro saves snippets, extra format optio...

Extract and inspect JSON-LD and microdata schema markup on the active page. Pro saves snippets, extra format options, and ExtHub...

Pick an element on the page and copy a unique CSS selector for it. Pro saves snippets, extra format options, and ExtHub sync.

Test XPath on the page — recipes, click-to-pick, scroll-to-match, saved queries, and copy paths. Pro saves snippets, extra format...

Count unique CSS class names used in the current page DOM. Pro saves reports, export, and ExtHub sync.

Test, highlight, and replace with regex — recipes, flags, groups, and saved patterns locally. Pro saves snippets, extra format op...

Encode and decode Base64 locally. Live, URL-safe, wrap. Free stays local. Pro syncs named pads via ExtHub.

Compare two texts with a local line-level diff view. Pro saves snippets, extra format options, and ExtHub sync.

Create SHA hashes of text locally with Web Crypto. Pro saves snippets, extra format options, and ExtHub sync.

Format, minify, and validate JSON locally in your browser. Pro saves snippets, extra format options, and ExtHub sync.

Generate version-4 UUIDs locally and keep a short history. Pro saves snippets, extra format options, and ExtHub sync.

Base64 and URL encode/decode tools in a simple textarea workspace. Pro saves snippets, extra format options, and ExtHub sync.

Compare two text blocks with a simple colored line diff. Pro saves snippets, extra format options, and ExtHub sync.

Design CSS gradients with multiple stops, linear/radial/conic modes, presets, favorites, and page preview. Pro saves snippets, ex...

Hash text locally with Web Crypto SHA-256, SHA-384, and SHA-512. Pro saves snippets, extra format options, and ExtHub sync.

Decode JWT header and payload JSON locally without signature verification. Pro saves snippets, extra format options, and ExtHub s...

Convert between px, rem, and em using a local base font size. Pro saves snippets, extra format options, and ExtHub sync.

Pick two elements and compare their key computed CSS styles side by side. Pro saves snippets, extra format options, and ExtHub sync.

Query pasted JSON with simple JSONPath-style paths and copy the matches. Pro saves snippets, extra format options, and ExtHub sync.

Generate UUID v4, ULID-like, and Nano-like identifiers in bulk with local history. Pro saves snippets, extra format options, and...