🔁 Base64 Encoder & Decoder – Convert Text and Files Instantly

Use this free Base64 Encoder & Decoder tool to quickly convert between plain text and Base64 format. It’s perfect for encoding binary data for transmission via text-based protocols or decoding Base64 strings back to readable content.

No server. No upload. 100% private and fast — all in your browser.

📘 What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data using only ASCII characters. It’s commonly used to transmit images, files, or binary payloads in environments that only support plain text (like JSON, XML, or HTML).

Key Facts:

Base64 uses 64 characters: A-Z, a-z, 0-9, +, /
Encoded data is always larger than original (about 33% increase)
It is not encryption — just encoding (easily reversible)

Example:

Original text: hello
Base64 encoded: aGVsbG8=

🛠️ How the Base64 Tool Works

This tool uses JavaScript’s btoa() and atob() methods (with polyfills for Unicode) to encode and decode Base64 strings directly in your browser. Nothing is uploaded — all processing is local.

Key Features:

✅ Instant encode/decode functionality
🔐 Secure – works entirely on your device
📎 Supports text and file content (optional file input)
📜 Handles UTF-8 and multiline input
🔄 Switch easily between encoding and decoding modes

🚀 How to Use This Tool

Choose between Encode or Decode mode.
Paste or type your input string in the text box.
Click the “Convert” button.
Instantly get the result in the output area.
Click Copy to grab the result to your clipboard.

You can also drag in a small file (like an image or PDF) to get the Base64 content or decode Base64 content back to raw text.

🔍 Examples

Encoding Example

Input Text: {"id":123,"name":"Alice"}

Base64 Output: eyJpZCI6MTIzLCJuYW1lIjoiQWxpY2UifQ==

Decoding Example

Base64 Input: SGVsbG8sIFdvcmxkIQ==

Decoded Output: Hello, World!

🧰 Common Use Cases

🌐 Embedding small images or files in HTML/CSS (<img src="data:image/png;base64,...">)
📦 Transmitting binary data in JSON or XML
🔐 Encoding credentials for HTTP Basic Auth headers
🛡️ Obfuscating data in URLs or web apps
🧪 Generating test data in APIs and payloads
📥 Uploading files over REST APIs as Base64 strings

📎 Base64 in Real-World Systems

Application	Example Use Case
Web Development	Embedding image/font as inline data
APIs & REST	Encoding binary files in JSON bodies
Email (MIME)	Sending attachments securely
Cloud Functions	Passing file content over webhooks
JavaScript & Node	Encoding buffers and file streams

❓ Frequently Asked Questions (FAQ)

Is Base64 encryption?

No. Base64 is just encoding. It can be easily decoded by anyone — it does not provide security or secrecy.

Can I encode files with this tool?

Yes (if file upload is supported). Otherwise, paste the content or use a CLI like base64 file.txt in Unix systems.

Why is the Base64 output longer than the input?

Base64 increases the size of the data by roughly 33%, as it must represent every 3 bytes with 4 characters.

Does this support Unicode and emojis?

Yes! This tool properly handles UTF-8 encoded characters, including emojis and special symbols.

Will this work offline?

Yes. Once loaded, this page can function without an internet connection.

💡 Developer Tips

Combine Base64 encoding with gzip for compression if needed.
Never use Base64 to store passwords — it's not encryption!
Use atob() and btoa() in the browser, or Buffer.from(...).toString('base64') in Node.js.
Many APIs require Base64 for sending binary blobs — especially image uploads.

🔗 Related Tools

📌 Final Thoughts

Base64 is a powerful and lightweight method for encoding binary or structured data in plain text. Whether you're working on a front-end, building APIs, or processing webhooks, this Base64 Encoder/Decoder tool makes it fast and easy to encode or decode your content — securely and privately.

🔁 Bookmark this tool to quickly convert Base64 strings for development, testing, or debugging any time.

Base64 Encoder & Decoder

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