Base64 Encode & Decode

Base64 Tool
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Upload a file or type text to generate Base64.

What Is Base64 Encode & Decode?

Base64 is a binary-to-text encoding scheme designed to represent binary data in an ASCII-safe format. Using a 64-character alphabet consisting of uppercase and lowercase letters, numbers, and the symbols "+" and "/", Base64 ensures that binary data can be reliably stored and transmitted across any text-based platform. The "=" symbol is used as a padding character when necessary to ensure proper block alignment.

Because Base64 translates binary bytes into printable characters, it prevents data corruption during transmission across protocols that only support text, such as HTTP headers, JSON payloads, XML documents, and email MIME streams.

Our free online Base64 tool allows you to convert text, data URIs, and files to and from Base64 instantly. Note that Base64 is an encoding mechanism rather than encryption. All operations run entirely within your browser, ensuring your data remains private and never leaves your device.

How to Use the Base64 Encoder & Decoder

Follow these steps to encode text or files to Base64, or decode a Base64 string back to its original form.

1

Select Encode or Decode mode using the toggle switch at the top of the input card.

2

Choose Text or File input. For text, type or paste your content directly. For files, drag and drop or click to upload (max 10 MB).

3

The output appears instantly in the Response panel on the right. For text input, conversion happens as you type.

4

Use the Copy button to copy the result to your clipboard, or click the Download button to save it as a text file.

5

In Decode mode, an additional Download as File button lets you reconstruct and save the original binary file from the Base64 string.

"All processing happens entirely in your browser. No data is ever sent to a server, making this tool safe for encoding API keys, tokens, and data payloads."

Why Use Our Base64 Encoder & Decoder?

A fast, private, and feature-rich tool built for developers and everyday users who need reliable Base64 conversion without privacy trade-offs.

100% Client-Side Privacy

All Base64 encoding and decoding is processed directly in your browser. No strings, tokens, or files are sent to external servers or logged in databases, ensuring absolute confidentiality.

Instant Real-Time Conversion

Results are generated in real time as you type with zero server latency. Our debounced client-side engine handles large text inputs smoothly without freezing your browser.

File Encode & Decode Support

Upload common file types (image, pdf, csv, json), and generate base64 string data, or enter base64-encoded string data to recover the binary file.

Download Output Instantly

Save your Base64 encoded or decoded text results directly to a file with one click, or download reconstructed binary files in Decode mode.

Supports Multiple Data Types

Works seamlessly with plain text, JSON payloads, HTML content, API authentication tokens, image data URIs, and binary files.

Built for Developers

Ideal for fast development work. Encode API credentials, decode REST API responses, validate JWT tokens, and view data URIs straight from your browser.

One-Click Copy

Quickly copy encoded or decoded Base64 strings directly to your clipboard for instant use in your code, terminal, or documentation.

No Registration Required

No account creation, API key, or subscription needed. Open the page and convert strings or files immediately without restrictions.

Common questions about Base64 encoding and decoding.

Base64 Encode & Decode FAQ

Base64 is a binary-to-text encoding scheme that represents binary data using a 64-character subset of ASCII (A-Z, a-z, 0-9, +, and /). It is commonly used to safely transmit binary data over text-based protocols like JSON, XML, HTML, and email bodies.
No. Base64 is an encoding scheme, not encryption. It does not conceal or secure data, and anyone who receives a Base64 string can decode it instantly without a key or password.
Base64 encoding uses 4 ASCII characters to encode 3 bytes of binary information, causing a 33% increase in file size. This additional file size is required for ensuring that binary information is protected in a text-based channel of transmission.
Use Base64 when you need to embed binary assets inside text-based formats. Common examples include embedding images in CSS/HTML data URIs, including binary attachments in JSON API payloads, and formatting email attachments in MIME.
However, the standard Base64 contains symbols + and / that have special meaning in URL addresses. The URL-safe Base64 replaces these symbols by - and _, respectively, thus making it possible to use the encoded strings within URLs.
Yes. You can decode any valid Base64 string, including data URIs, API tokens, and encoded files. If the string is corrupted or contains invalid characters, the tool will display an error message.
No. All data processing occurs locally within your browser using client-side JavaScript. No text, credentials, or uploaded files are ever sent to a server or stored.
The tool supports files up to 10 MB, including PDFs, PNG, JPEG, SVG, WebP images, CSV, JSON, and plain text files. Files are read as binary in your browser and converted to Base64 strings.
Switch to Decode mode, paste the Base64 string or upload a Base64 text file, and click 'Download as File' to reconstruct and save the original binary file.
The encoding of the UTF-8 character string to Base64 is achieved by typing or pasting text. File uploads encode the binary content of the file directly to Base64.

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Disclaimer

The Base64 Encode & Decode tool is provided for educational and developmental purposes. While we ensure privacy by processing data locally, we recommend avoiding the conversion of sensitive or confidential credentials on public platforms.