Free Base64 Encoder | Text & File Encoder

100% Client-Side Processing

Base64 Encoder & Decoder

Encode text and files to Base64 or decode Base64 strings back to text. All operations run entirely in your browser - your data never leaves your device.

Encoding Mode

Enter Plain Text

Upload File

Drag and drop your file here

or click to browse (images, PDFs, documents)

Enter Base64 String

Invalid Base64

0%

Validating Input...

Output

Input Size: 0 bytes

Output Size: 0 bytes

MIME: -

Operation Completed

Your data has been processed successfully.

How To Use The Base64 Encoder

1

Select Your Mode

Choose between Text encoding, File encoding, or Base64 decoding based on your needs.

2

Input Your Data

Enter text, upload a file, or paste a Base64 string. Drag and drop is supported for files.

3

Process Your Data

Click the encode or decode button. Processing happens instantly in your browser.

4

Copy or Download

Use the copy button for quick clipboard access or download as a file for later use.

Frequently Asked Questions

Base64 is a binary-to-text encoding scheme that converts binary data into an ASCII string format. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent data, making it safe for transmission over text-based protocols like email or JSON.

Yes, completely. All encoding and decoding operations happen locally in your browser using JavaScript. No data is ever sent to any server. Your files and text remain entirely on your device throughout the entire process.

Base64 encoding increases data size by approximately 33% because it encodes every 3 bytes of binary data into 4 ASCII characters. This overhead is the trade-off for being able to safely transmit binary data through text-only channels.

You can encode any file type - images (PNG, JPG, GIF, WebP), documents (PDF, DOC, XLS), audio files, video files, and more. The tool automatically detects the file type and includes the appropriate MIME type in the output when relevant.

The tool validates your Base64 input before attempting to decode. If the string contains invalid characters or has incorrect padding, you'll see a clear error message explaining the issue. Common problems include missing padding characters (=) or typos in the encoded string.

Yes. If your Base64 string includes a data URI prefix (like "data:image/png;base64,"), the tool will decode it and you can download the resulting file with the correct extension. For plain Base64 strings, you can still decode and save the result.

Base64 is commonly used for embedding images in HTML/CSS, storing binary data in JSON, email attachments, API responses with binary data, and configuration files. It's essential when you need to represent binary data in text format.

Since processing happens in your browser, limits depend on your device's available memory. Most modern browsers can handle files up to 50-100MB without issues. For very large files, you might notice slower processing, but the tool will still work.

All Base64 encoding and decoding are performed entirely in your browser. No text or files are stored, transmitted, or processed on any server. Your data remains completely private.

Encode and decode Base64 instantly — secure, private, and 100% client-side.

Copied to clipboard!