Format, validate, encode, and debug in the browser. JSON, regex, hashes, JWT, and more — utilities built for developers who need answers now.
16 tools
Format, beautify, minify, and validate JSON in your browser. Syntax highlighting, error detection, and key sorting — free, instant, no signup or upload.
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Validate JSON in real time with line and column errors. Auto-repair trailing commas, unquoted keys, and single quotes — free, private, no signup or upload.
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Test regular expressions against sample text
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Encode and decode Base64 in your browser with Unicode, URL-safe alphabet, and live conversion. No upload, no signup — free online Base64 encoder and decoder.
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URL-encode and decode query strings and full URLs with encodeURI or encodeURIComponent. Component vs full URI, live conversion — free, private, no upload.
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Encode and decode HTML entities with named or numeric modes, special characters or all characters, and a live preview. Free developer tool, no upload.
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Decode JWT tokens in your browser: inspect header, payload, claims, and expiration. The signature is not verified. Free, private, no signup or upload.
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Convert colors between HEX, RGB, HSL, and more
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Minify CSS in your browser: strip comments and whitespace, optionally keep /*! */ license banners, and see the size reduction — free, no signup or upload.
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Minify JavaScript in your browser: remove comments and whitespace, keep license banners, and preserve strings and regex — free, private, no signup or upload.
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Minify HTML in your browser: remove comments, collapse whitespace, and tighten attributes. See the size reduction — free, private, no signup or upload.
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Format minified or messy CSS with 2-space, 4-space, or tab indentation. See rule and selector counts — free online CSS beautifier, no signup or upload.
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Beautify minified or tangled JavaScript with 2-space, 4-space, or tab indent and optional semicolons. Free online JS formatter — private, no file upload.
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Format SQL queries in your browser with indent and optional uppercase keywords. See query type and tables — free, private, and it does not run queries.
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Compare two code snippets and highlight differences
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Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text in your browser. UTF-8 input, optional uppercase hex — free, no signup or upload.
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Generate UUID v1, v4, and NIL identifiers in bulk, with uppercase and hyphen options, all in your browser — free online UUID tool, no signup or upload.
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Generate Lorem Ipsum paragraphs, sentences, or words with optional HTML wrapping and the classic opening line — free placeholder text, no signup or upload.
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Convert Unix timestamps to dates and back
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Build and explain cron expressions
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Preview Markdown as HTML with headings, lists, tables, and fenced code blocks. Optional dark preview — private client-side rendering, no signup or upload.
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Turn code snippets into shareable images
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Send HTTP requests and inspect API responses
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Explain code with AI in plain language
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