Base64 Encoder & Decoder

Encode text and images to Base64 data URLs, or decode Base64 back to plain text and downloadable files.

Base64 Encoder & Decoder

Convert text, code, or images into Base64 strings and HTML Data URLs, or decode Base64 data instantly.

Input Plain Text0 chars (0 B)
Base64 Output0 chars (0 B)
Drag & Drop Image Here
Supports PNG, JPG, WEBP, SVG, GIF (Max 10 MB)
Paste Base64 or Data URL String

The DwellixTools Base64 Encoder & Decoder is a fast, reliable online utility designed for developers, designers, and webmasters. Easily convert plain text, code, or images into Base64 strings and Data URLs, or decode Base64 data back into original text and downloadable files.

Built with native browser btoa(), atob(), and FileReader APIs, all conversion happens 100% locally in your browser with zero data sent to external servers.

Key Features

  • Text Base64 Encoding & Decoding: Convert plain text, JSON, or code to Base64 and decode Base64 back to plain text.
  • Image to Base64 Data URL Converter: Drag and drop PNG, JPG, WEBP, SVG, or GIF images to convert them directly into inline HTML/CSS Data URLs (data:image/png;base64,...).
  • HTML & CSS Code Snippet Copy: One-click copy for <img> tags and CSS background-image properties.
  • Live File Preview: Instant visual preview of decoded images and downloadable files.
  • URL-Safe Base64 Option: Support for URL-safe Base64 encoding (replacing + with - and / with _).
  • 100% Client-Side Privacy: All file parsing and string conversions run entirely in your local browser for maximum confidentiality.

How to Use the Base64 Converter

Text Encoding & Decoding:

  1. Select the Text Encode / Decode tab.
  2. Type or paste text into the input field.
  3. Click Encode to Base64 or Decode from Base64.
  4. Click Copy Result to copy the output to your clipboard.

Image to Base64:

  1. Select the Image to Base64 tab.
  2. Drag and drop any image file (PNG, JPG, SVG, WEBP).
  3. View the instant image preview and copy the formatted Base64 Data URL or HTML <img> tag snippet.

Frequently Asked Questions (FAQs)

What is Base64 encoding?

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is widely used to embed images, fonts, and binary payloads directly in HTML, CSS, JSON, or emails without separate file transfers.

Are my files or text uploaded to a server?

No! All encoding and decoding happen 100% client-side in your web browser. Your private data and image files never leave your device.

What is an image Data URL?

An image Data URL is a scheme that allows you to inline image files directly into HTML or CSS code using Base64: <img src="data:image/png;base64,iVBORw0KGgo..." />.