Free Base64 Encoder / Decoder

Easily encode text to Base64 or decode Base64 strings back to text.

Input

Output

Advertisement Placeholder

How to use Free Base64 Encoder / Decoder

Choose 'Encode' to convert text to Base64, or 'Decode' for the reverse.

Paste your text into the input box.

Click 'Process' to see the result.

Copy the output.

Why use this tool?

Universal

Works with all standard Base64 implementations.

Fast

Instant client-side processing.

Reliable

Handles large strings efficiently.

Free Base64 Encoder/Decoder - Encode & Decode Data Securely

Encode and decode Base64 data instantly for APIs, emails, and data URIs. Convert text, files, and images to Base64 format or decode back to original content. Essential for developers handling authentication tokens, embedded images, and data transmission. All processing happens client-side—your data never leaves your device.

Quick How-To Guide

1Paste your text or upload a file you want to encode or decode
2Click "Encode" to convert plain data to Base64 format
3Click "Decode" to convert Base64 back to readable text or binary file
4For images, use "Image to Data URI" mode for HTML/CSS embedding
5Copy the result or download the decoded file to your device

Why use our tool?

Bidirectional conversion—encode to Base64 or decode back to original format seamlessly

Multiple input types—handle text strings, file uploads, images, and binary data

Large file support—process files up to 50MB without performance degradation

Image to Data URI—convert images to embeddable Base64 data URIs for CSS/HTML

Automatic detection—smart recognition of Base64-encoded vs plain text input

Zero uploads—all encoding/decoding happens locally for maximum data privacy

Frequently Asked Questions

Find answers to common questions about using our tool, its features, and how it handles your data privacy.

Base64 converts binary data into ASCII text using 64 characters, enabling binary transmission over text-only channels. Common uses: embedding images in HTML/CSS (data URIs), sending files via JSON APIs, encoding authentication credentials (HTTP Basic Auth), storing binary data in text-only databases, transmitting SSL certificates, and email attachments (MIME encoding).

No! Base64 is encoding, not encryption. It's easily reversible by anyone—there's no security. Never use Base64 alone to protect sensitive data like passwords or API keys. If you see credentials in Base64, they're NOT secure. For actual security, use encryption algorithms (AES, RSA) first, then optionally Base64-encode the encrypted output for text transmission.

Base64 increases size by ~33% because it converts every 3 bytes of binary data into 4 ASCII characters. A 1MB file becomes ~1.33MB when encoded. This overhead is necessary for text compatibility. Use Base64 only when required (APIs, data URIs, email). For direct file transmission, binary formats are 33% more efficient.

It depends on image size. For small icons and logos (<10KB), Base64 data URIs eliminate HTTP requests and speed up initial page loads. For larger images (>10-20KB), link to separate files—they'll load faster and enable browser caching. Base64 images can't be cached separately and bloat your HTML/CSS file size.

Yes, completely secure. All encoding and decoding happens entirely in your browser using JavaScript. Your files, credentials, or sensitive data are never uploaded to any server or transmitted over the internet. Safe for API keys, authentication tokens, confidential documents, or any private data. Works offline once the page loads.

Advertisement Placeholder

You Might Also Need

Explore more powerful tools tailored for your workflow.

JSON Formatter

Prettify and validate JSON data.

Popular✓ Ready

UUID Generator

Generate unique identifiers (v4).

✓ Ready