Free Online Converters - Unit, Currency, Data Formats

Free online converters for units, currency, data formats, and encoding. Fast and accurate conversions.

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Unit Converter

Convert between 8 categories: length, weight, temperature, area, volume, speed, time, data.

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Currency Converter

Convert between 30+ world currencies with static exchange rates.

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CSV to JSON

Convert CSV data to JSON format with customizable delimiter.

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HTML to Markdown

Convert HTML code to clean Markdown text instantly.

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Base64 Encoder/Decoder

Encode and decode Base64 strings. Supports text and file data.

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URL Encoder/Decoder

Encode and decode URLs and URI components safely.

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Hash Generator

Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes using Web Crypto API.

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Color Converter

Convert between HEX, RGB, and HSL color formats with live preview.

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JSON to CSV

Convert JSON arrays to CSV format with customizable columns and delimiter.

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Guides & Tutorials

Base64 Encoding: What It Is, Why It Exists, and When to Use It → CSV to JSON in 3 Seconds: The Developer's Quick Conversion Guide → Currency Conversion: How to Avoid the 3-5% Hidden Fee → JSON for Beginners: What It Is and How to Use CSV to JSON Conversion → Kitchen Unit Conversion Chart: Cups, Tablespoons, Grams, ML → Celsius to Fahrenheit: The Mental Math Trick (+ Common Conversions Table) → URL Encoding Explained: When and Why to Encode URLs →