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Developer Tools

Free developer tools that run entirely in your browser — JSON formatter, Base64, hashing, JWT, regex, UUID, and more. No data leaves your device.

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JSON Formatter & Validator

Format, beautify, minify, and validate JSON with clear error messages.

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Code Beautifier & Minifier

Beautify or minify HTML, CSS, and JavaScript instantly, right in your browser.

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JSON to TypeScript

Generate TypeScript interfaces from any JSON object, with nested types inferred automatically.

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Meta Tag Generator

Generate SEO and Open Graph meta tags for your web page from a simple form.

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Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text, with full Unicode support.

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URL Encode / Decode

Percent-encode or decode text for safe use in URLs and query strings.

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Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.

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JWT Decoder

Decode a JSON Web Token to read its header and payload claims.

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UUID Generator

Generate one or many random version-4 UUIDs instantly.

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Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates, both ways.

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Regex Tester

Test regular expressions live with match highlighting and capture groups.

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Color Converter

Convert colors between HEX, RGB, and HSL with a live swatch preview.

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Text Diff Checker

Compare two blocks of text and highlight every added, removed, and unchanged line.

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Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal instantly.

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JSON ↔ CSV Converter

Convert a JSON array of objects to CSV and back, right in your browser.

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HTML Entity Encoder / Decoder

Encode special characters to HTML entities or decode entities back to text.

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Markdown Previewer

Write Markdown and see a live HTML preview, then copy the generated HTML.

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JSON ↔ YAML Converter

Convert JSON to YAML and YAML to JSON instantly, with validation, in your browser.

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CSS Gradient Generator

Build linear and radial CSS gradients visually with live preview and copyable CSS code.

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Color Palette Generator

Generate harmonious color palettes and shade scales from a base color, with hex codes to copy.

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Favicon Generator

Turn any image into favicon sizes (16–512px) and download them all as a ZIP, in your browser.

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Cron Expression Parser

Translate a cron expression into plain English and see the next scheduled run times.

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SQL Formatter

Format and beautify SQL queries with indentation and keyword casing, for many SQL dialects.

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JSON ↔ XML Converter

Convert JSON to XML and XML to JSON, with formatting, in your browser.

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Image to Base64 Converter

Encode an image to a Base64 data URI (and back), with ready-to-paste HTML and CSS snippets.

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IP Subnet Calculator

Compute network, broadcast, host range, and mask from an IPv4 address and CIDR or subnet mask.

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HMAC Generator

Generate an HMAC signature from a message and secret key using SHA-256, SHA-384, or SHA-512.

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