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Base64 Encoder / Decoder
Base64 Encoder & Decoder — Text, Files & Images
Encode and decode Base64 online. Supports text and images. Nothing is sent to servers.
Input Type:
Direction:
Plain Text
Base64 Output
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Quick Start Instructions
Encode text, binary files, or images to Base64 — or decode a Base64 payload back to readable output. Supports URL-safe mode. Runs entirely in your browser.
- 1Choose operation mode: Encode or Decode.
- 2Type raw text or upload a binary file (image/document).
- 3View the transformed Base64 string or original decoded content.
- 4Copy the text output or download the decoded file.
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Frequently Asked Questions
What is Base64 encoding actually used for in web development?
Safe data transfer over text-based protocols like HTTP/SMTP.
Is Base64 encoding the same as data encryption?
No, it provides zero security and is easily reversible.
Can I convert an image to Base64 for inline CSS/HTML embedding?
Yes, it generates valid Data URIs for CSS.
Why does my decoded text look like random gibberish?
You might be decoding a binary file as UTF-8 text; download as file instead.
Does Base64 encoding increase the total file size?
Yes, it inflates payloads by approximately 33%.
Detailed Guide & Overview
Encode and Decode Base64 Strings Instantly
Base64 encoding is essential for developers who need to transmit binary data over text-based protocols like HTTP or embed images directly into CSS and HTML files. Our free online Base64 encoder and decoder allows you to instantly convert plain text into Base64 format and vice versa, streamlining your development workflow.
Perfect for Developers and API Debugging
Whether you are debugging a JSON Web Token (JWT), setting up Basic Authentication headers for an API request, or trying to reverse-engineer an encoded payload, you need a reliable decoder. This tool handles standard UTF-8 text encoding flawlessly, ensuring special characters and emojis are encoded and decoded correctly without data corruption.
100% Client-Side Security
API keys, passwords, and sensitive payloads should never be pasted into unverified online tools. We guarantee your security by processing all Base64 encoding and decoding strictly within your browser using JavaScript. Your sensitive strings never leave your device and are never logged or stored on our servers.