Converting data from one format to another for safe transport or storage. Common types: Base64 (binary data), URL Encoding (web links), and HTML Entities (safe text).

What's the difference between Base64 and URL Encoding?

Base64 converts any data (images, files) to readable ASCII text — used in APIs and Data URLs. URL Encoding converts disallowed characters in URLs (%20 for space, %3F for question mark).

What is HTML Entities encoding?

Converting special characters to HTML Entities — e.g., → >, & → &. Prevents XSS attacks and ensures proper rendering in browsers.

Is encoding secure encryption?

No! Encoding is not encryption. It can be easily reversed. Don't use it to protect sensitive data. Use AES or RSA for real encryption.

When should I use URL Encoding?

When building URLs with spaces or special characters — e.g., 'search tools' → 'search+tools'. Browsers require URL Encoding for proper link handling.

When should I use Base64 Encoding?

Embedding images in HTML (Data URL: ), transmitting data in JSON APIs, sending attachments in email (MIME).

What's the difference between encodeURI and encodeURIComponent?

encodeURI: encodes a full URL (preserves / : ?). encodeURIComponent: encodes a URL segment (encodes ALL special chars). Use encodeURIComponent for query parameters.

Does encoding affect data size?

Yes — Base64 increases size by ~33%. URL Encoding varies based on how many special characters are encoded. HTML Entities adds minimal overhead.

How do I decode text in JavaScript?

Base64: atob(str) to decode, btoa(str) to encode. URL: decodeURIComponent(str) to decode, encodeURIComponent(str) to encode. HTML: use DOMParser or a library.

What are common encoding mistakes?

Forgetting to encode Arabic/text before sending in URLs (causes garbled text). Using Base64 for encryption (insecure). Forgetting to decode before displaying text to users.

🔧 Encodeur/Décodeur URL

Encodez et décodez du texte en plusieurs formats

📖 Usage Guide

En ligne gratuit encoder and decoder tool supporting three methods: Base64 encoding/decoding for binary data transmission, URL encoding/decoding for safe web links, and HTML entity encoding for XSS-safe text. Everything runs in your browser — no data is sent to any server.

Every web developer needs to understand encoding: Base64 for image data and API payloads, URL Encoding for query parameters and links, and HTML Entities for preventing XSS attacks in web applications.

Encoding is NOT encryption — any encoded data can be trivially reversed. Use encoding for representation and transport, not for security. For protection, use bcrypt (passwords) or TLS (transport).

This tool works 100% client-side — your text never leaves your browser. Full privacy guaranteed.

❓ Frequently Asked Questions

Answers to the most common questions

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📖 Usage Guide

❓ Frequently Asked Questions

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