Base64 Decoder

Decode Base64 strings back into readable text or downloadable file data instantly. This decoder supports standard Base64, URL-safe Base64, data URIs, MIME detection, image preview, and copy-ready decoded output.

Base64 to Text Base64 to File Animated Hover UI

Decode safely inside your browser

Paste Base64 or a full data URI and instantly decode it without uploading your value to a server.

Free Base64 Decoder

Paste a Base64 string, URL-safe Base64, or full data URI and decode it into text or file output.

Enter Base64 Value

Decode Mode Select output type

Base64 Input Standard, URL-safe, or data URI

Text Encoding

Download File Name

Please enter a valid Base64 value.

Quick Examples

Decoded Results

Decoded Text Output No decoded text yet.

Clean Base64 Input No clean Base64 yet.

File Preview / Download No file output yet. Decoded Base64 image preview

Download Decoded File

Input Size 0 Characters

Decoded Size 0 Bytes

Detected Type Unknown

Base64 Format Not detected

Result copied successfully.

What Is a Base64 Decoder?

A Base64 Decoder is an online tool that converts Base64 encoded data back into readable text or downloadable binary file data. It is useful when you need to inspect encoded text, JSON, HTML, images, PDFs, or API payloads.

Base64 is an encoding format, not encryption. That means Base64 data can be decoded back to its original content by anyone who has the encoded string.

Base64 Decode Basics

SGVsbG8= decodes to Hello

Data URI format: data:type/subtype;base64,value

URL-safe Base64 uses - and _ instead of + and /

Why Base64 Decoding Matters

Base64 decoding is useful for web development, debugging API responses, reading encoded files, checking email attachments, decoding data URIs, and converting encoded text back into normal content.

How It Works

Paste Base64 value

Enter standard Base64, URL-safe Base64, or a full data URI string.

Select decode mode

Use auto detect, decode as text, or decode as downloadable file output.

View decoded result

The tool shows decoded text, clean Base64, MIME type, size details, and preview if supported.

Copy or download

Copy decoded text or download the decoded data as a file from your browser.

Base64 Decoder FAQs

Simple answers about Base64 decoding, URL-safe Base64, data URIs, files, and browser-based decoding.

A Base64 Decoder converts Base64 encoded strings back into readable text or downloadable binary file data.

No. Base64 is encoding, not encryption. Decoding simply converts the encoded text back to its original format.

Yes. The decoder automatically handles URL-safe Base64 by converting hyphens and underscores back to standard Base64 characters.

Yes. If the Base64 represents file data, you can download the decoded output as a file directly from your browser.

No. The decoding runs in your browser. Your Base64 input is not uploaded to the server by this tool.