Base64 Encoder & Decoder

Encode text or upload images to Base64 instantly, decode back just as easily, all processed locally in your browser for privacy and speed.

Input Output

Docs

Base64 Encoder & Decoder is a browser-based utility for converting plain text, files, and Base64 data without server-side upload. All operations run locally in your browser, which makes it practical for API debugging, frontend embedding, Data URL workflows, and privacy-sensitive data handling.

Core Features

Text to Base64 encoding.
Base64 to text decoding.
File upload and automatic Data URL/Base64 conversion.
Image preview when data represents an image.
One-click copy for output content.
Output download as text file.
100% local processing in the browser.

How to Use

Select mode: Encode or Decode.
Paste input text/Base64/Data URL, or upload a file for conversion.
Run conversion and review output immediately.
Copy or download the result, and check image preview if available.

Typical Scenarios

Convert images or SVG assets to Base64 for inline frontend usage.
Decode Base64 payloads from APIs during troubleshooting.
Prepare Base64 text for transport, signature workflows, or storage.
Generate Data URL strings quickly for mockups and prototyping.

Notes

Decoding requires valid Base64 input.
Very large files may consume significant browser memory.
Preview is shown only when content is recognized as image data.

Last verified: 2026-04-03
Source: marcrobledo/base64-converter