File Base64 Encoder/Decoder

Upload files for Base64 encoding or decoding operations, support downloading processed files

2 uses | 5.0 rating

File Processing

Base64 Encode

Base64 Decode

Character Set

Select File

Drag and drop files here, or

Keep Original File Name

Automatically Add File Extension

Processing Result

Not Processed

Please upload and process a file to view the result

Instructions

Select Operation Type

Choose whether to perform Base64 encoding or decoding operation.

Select Character Set

Select the character encoding of the file, default is UTF-8.

Upload File

Drag and drop files to the upload area or click the browse button to select files.

Process File

Click the "Process File" button, the system will perform Base64 encoding or decoding on the file.

Download Result

After processing is complete, you can view file information and download the processed file.

Base64 Basics

What is Base64

Base64 is an encoding method that represents binary data based on 64 printable characters (A-Z, a-z, 0-9, +, /). It is a binary-to-text encoding scheme commonly used in scenarios where binary data needs to be transmitted through text protocols.

In file processing, Base64 converts binary files to text format for easy storage and transmission in text environments.

Application Scenarios

Embedding images and attachments in emails
Passing binary data in URLs
Storing binary data in text formats such as XML and JSON
Embedding small images in web development (Data URI scheme)
Transmitting file data in API calls

Base64 Encoding Table

Index	Character	Index	Character	Index	Character	Index	Character
0-25	A-Z	26-51	a-z	52-61	0-9	62-63	+ /

Encoding Process Example

Base64 encoding converts 3 bytes (24 bits) into 4 6-bit blocks, each corresponding to a character in the Base64 encoding table. If the length of the input data is not a multiple of 3, the padding character "=" is used.

Example: Encoding string "ABC"

ASCII values: A=65, B=66, C=67
Binary: 01000001 01000010 01000011
6-bit grouping: 010000 010100 001001 000011
Decimal values: 16 20 9 3
Base64 characters: Q U J D
Result: "QUJD"

URL-Safe Base64

The "+" and "/" characters in standard Base64 have special meanings in URLs, so URL-safe Base64 variants have emerged. In URL-safe Base64:

"+" is replaced with "-" (hyphen)
"/" is replaced with "_" (underscore)
The padding character "=" is usually omitted

Pros and Cons Analysis

Pros

Can safely transmit binary data in plain text environments
Encoding results are printable, easy for manual reading and copying
Simple algorithm, easy to implement
Widely supported, almost all programming languages have built-in implementations

Cons

Encoded data size increases by about 33% (3 bytes become 4 bytes)
Not an encryption algorithm, cannot provide data security
Lower processing efficiency for large files

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