Base64 Encode/Decode — Free Online Tool

Base64 Encode/Decode · Free online tool · 100% offline · No data collection Open in App

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What is Base64 Encode/Decode?

Base64 Encode/Decode is a free online tool that converts text to Base64 encoding and decodes Base64 strings back to plain text. Base64 is a binary-to-text encoding scheme used everywhere — from embedding images in HTML/CSS to encoding credentials in HTTP headers and JWT tokens. This tool handles it instantly, offline, with no data leaving your browser.

How to use Base64 Encode/Decode

1 Paste your text or Base64 string into the input field

2 Click Encode to convert text → Base64, or Decode for Base64 → text

3 The result appears instantly — copy it or download as a .txt file

Common use cases

Encoding credentials for Basic Authentication headers
Embedding small images as Base64 data URIs in CSS/HTML
Decoding Base64-encoded API payloads for debugging
Converting binary data to text-safe format for JSON/XML transport

Frequently Asked Questions

What is Base64 encoding used for?

Base64 converts binary data into ASCII text — commonly used for embedding images in HTML/CSS, encoding API credentials, email attachments (MIME), and JWT tokens.

Is my data safe when using this tool?

Absolutely. All encoding/decoding happens in your browser. Nothing is uploaded or transmitted — your data stays 100% private.

Can I encode/decode files with this?

The web version handles text-based Base64. For binary files, paste the Base64 string directly. The FluxBench desktop app supports drag & drop file encoding.

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