Encodeur/décodeur Base64

Encoder et décoder les chaînes Base64

Entrée

Résultat

Qu'est-ce que Base64 ?

Base64 est un système de codage binaire-texte qui représente des données binaires sous forme de chaînes ASCII. Il est couramment utilisé pour coder les données à transmettre sur des supports qui ne prennent en charge que le contenu textuel.

Cas d'utilisation

- Pièces jointes aux courriels - URL de données en HTML/CSS - Codage des jetons d'API - Stockage de données binaires en JSON/XML

What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent binary data, making it safe for transmission over text-based protocols.

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Email Attachments

MIME encoding for email attachments

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Data URIs

Embed images directly in HTML/CSS

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API Communication

Encode binary data in JSON/XML

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Authentication

HTTP Basic Authentication headers

How to Use the Base64 Converter

Text Encoding/Decoding:

Enter your text in the input field
Click "Encode" to convert text to Base64
Click "Decode" to convert Base64 back to text
Use "Swap" to exchange input and output

Image Conversion:

Click "Upload Image" to select an image file
The Base64 data URI will be generated automatically
Paste a Base64 string and click "Preview" to view as image
Copy the Base64 string for use in your code

Frequently Asked Questions

Why use Base64 encoding?

Base64 is essential when you need to transfer binary data through text-based protocols that don't support binary. It's commonly used in emails, data URIs, and API payloads.

Is Base64 encryption?

No, Base64 is encoding, not encryption. It doesn't provide any security - anyone can decode Base64 data. Use proper encryption if security is needed.

Why is Base64 output larger than input?

Base64 encoding increases data size by approximately 33% because it uses 4 characters to represent every 3 bytes of input data.

Is my data secure?

Yes! All encoding and decoding happens locally in your browser. Your data is never sent to any server.