Base64 Decode and Encode Online – Free

This tool runs entirely in your browser. Your text is never uploaded to our servers.

How It Works

1. Choose Your File

Drag & drop or select the file you want to work with.

2. Processed in Your Browser

Everything happens locally on your device — your file is never uploaded anywhere.

3. Download Your Result

Get your finished file instantly, ready to save or share.

About Base64 Decode and Encode Online

Base64 encoding converts binary data (like an image or file) into plain text characters, which matters because some systems and formats (like embedding an image directly inside a CSS file or an email) can only handle plain text, not raw binary data.

Importantly, Base64 is encoding, not encryption — it makes binary data text-safe for transmission, but it provides no actual security or privacy, since it can be decoded by anyone with a Base64 decoder in seconds. If you need to protect sensitive data, Base64 alone accomplishes nothing toward that goal.

A common practical use: embedding a small image directly into HTML or CSS as a “data URI” instead of linking to a separate image file, which can reduce the number of separate network requests a webpage needs to make — genuinely useful for very small images, though it makes larger files noticeably bigger than the original binary, since Base64 encoding increases size by roughly a third.

Frequently Asked Questions

How do I decode a Base64 encoded string?

Paste the Base64 text into the Input box and click Decode. The result appears in the Output box. The tool decodes standard Base64 to UTF-8 text. URL-safe Base64 using - and _ characters needs converting to + and / first, and decoded binary data will not display as readable text.

What is Base64 encoding?

Base64 is a way to represent any data using only 64 plain text characters (A-Z, a-z, 0-9, + and /), with = used for padding. The encoded text is about one third larger than the original. It is a format change, not a way to protect or compress data.

What is Base64 used for?

Common uses are embedding small images in HTML or CSS, sending binary data through text-only channels like JSON or email, and carrying credentials in HTTP Basic authentication headers. This tool handles text only. For image files, use the Image to Base64 tool instead.

Is Base64 encryption?

No. Base64 is encoding, not encryption. Anyone can decode it instantly without a key, so it gives no secrecy. Never use it to hide passwords or sensitive data. If you need confidentiality, use real encryption. Encoding and decoding here happens in your browser.