Developer Tools
A compact toolbox for debugging payloads, cleaning up markup, generating metadata, and keeping secrets out of online services.
13 tools 4 subcategories 100% local
JSON Formatter & Validator Pretty-print, minify, and validate JSON with helpful error positions and one-click copy.
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XML Formatter Validate and pretty-print XML with configurable indentation, or minify it for transport.
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Code Minifier Minify JavaScript, CSS, and HTML with real parsers and a safe, size-saving result.
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HTML Encoder & Decoder Escape or unescape HTML entities, including named entities, numeric references, and emoji.
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URL Encoder & Decoder Encode or decode URLs and query values with correct handling of reserved characters and Unicode.
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Base64 Encoder & Decoder Encode text or files to Base64 and decode Base64 back to text or bytes.
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2FA Code Generator Generate TOTP codes from a Base32 secret with support for SHA-1, SHA-256, SHA-512, and custom periods.
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Cron Expression Generator Build cron expressions from readable options, validate them, and preview the next run times.
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Meta Tag Generator Generate SEO, Open Graph, and Twitter meta tags with a live social preview.
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Robots.txt Generator Build a valid robots.txt with user agents, allow and disallow rules, crawl delay, and sitemap.
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XML Sitemap Generator Generate a valid XML sitemap from a base URL with priorities, change frequency, and last modified dates.
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Keep exploring
Other categories in the toolbox.
Calculators Everyday math, health, finance, and science calculators that run entirely in your browser.
Text Tools Write, count, transform, compare, and generate text without leaving the tab.
Converters Move cleanly between CSV, JSON, YAML, Markdown, HTML, and time zones.
Crypto & Security Hashes, classical ciphers, JWT inspection, and modern client-side encryption.
Browser Tools Network details and QR codes generated from your own browser.