Developer
Handy tools for developers and programmers: encoding, decoding, formatting and other everyday technical utilities.
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Base64 Encoder
Instantly and freely encode text to Base64, directly in your browser.
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Base64 Decoder
Instantly and freely decode Base64 text, directly in your browser.
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HTML Encoder
Convert special characters into HTML entities (&, <, >...).
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HTML Decoder
Convert HTML entities (&, <, >...) back into plain characters.
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QR Code Generator
Generate a custom QR code from any text or URL, choose its colors and download it as a PNG image.
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JSON Formatter & Validator
Format, minify and validate JSON instantly in your browser, with clear error messages.
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UUID Generator
Generate one or several random UUID v4 identifiers instantly, for free.
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Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text instantly, for free.
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Regex Tester
Test regular expressions against your own text live, with match count and positions.
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JWT Decoder
Decode a JSON Web Token (JWT) and inspect its header and payload instantly, in your browser.
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Text Diff Checker
Compare two texts line by line and instantly see what was added, removed or unchanged.
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CSV to JSON Converter
Convert CSV to JSON or JSON to CSV instantly, directly in your browser.
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QR Code Reader
Scan a QR code from an image or your camera and read its content instantly, in your browser.
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Markdown to HTML Converter
Convert Markdown to HTML or HTML to Markdown instantly, directly in your browser.
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Barcode Generator (EAN-13)
Generate a valid EAN-13 barcode from 12 digits, with automatic check digit, downloadable as PNG.
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URL Encoder / Decoder
Encode or decode a URL-encoded string instantly, directly in your browser.
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Hex Encoder / Decoder
Convert text to hexadecimal or hexadecimal back to text instantly, in your browser.
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Number Base Converter
Convert a number between decimal, binary, hexadecimal and octal instantly, all at once.
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Cron Expression Parser
Understand what a cron expression means in plain English, instantly, field by field.
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Wi-Fi QR Code Generator
Generate a QR code that connects to a Wi-Fi network automatically when scanned, instantly.
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vCard QR Code Generator
Generate a QR code that adds a contact to a phone's address book when scanned, instantly.
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Email QR Code Generator
Generate a QR code that opens a pre-filled email when scanned, instantly.
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SMS QR Code Generator
Generate a QR code that opens a pre-filled text message when scanned, instantly.
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Phone Number QR Code Generator
Generate a QR code that starts a phone call when scanned, instantly.
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Location QR Code Generator
Generate a QR code that opens a map at specific GPS coordinates when scanned, instantly.
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YAML to JSON Converter
Convert YAML to JSON or JSON to YAML instantly, directly in your browser.
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HTML Formatter
Format and indent messy HTML code instantly, directly in your browser.
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CSS Formatter
Format and indent minified CSS code instantly, directly in your browser.
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JavaScript Formatter
Format and indent minified JavaScript code instantly, directly in your browser.
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Code 128 Barcode Generator
Generate a Code 128 barcode from any text instantly, downloadable as PNG.
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UPC-A Barcode Generator
Generate a valid UPC-A barcode from 11 or 12 digits instantly, downloadable as PNG.
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Every tool in this category runs entirely in your browser: no data is ever sent to an external server, making them suitable even for sensitive or internal project information. Fast, free of intrusive ads, and accessible without sign-up, they're built to be used in seconds and closed again, exactly the way a good developer tool should work.