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Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format by translating it into a radix-64 representation. It's commonly used when there is a need to encode binary data that needs to be stored and transferred over media designed to deal with text.
Base64 encoding converts binary data into a text format using 64 different ASCII characters. This encoding helps ensure that the data remains intact without modification during transport through systems that might not handle binary data correctly.
The Base64 character set consists of 64 characters:
A-Z (26 characters)
a-z (26 characters)
0-9 (10 characters)
+ and / (2 characters)
The Base64 encoding process follows these steps:
Here's an example of how text is converted to Base64:
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Encode any file type to Base64 format, perfect for embedding images, documents, and binary files in text-based formats.
Generate URL-safe Base64 strings that can be safely used in URLs and filenames without encoding issues.
All encoding and decoding happens in your browser, ensuring your data never leaves your computer for maximum privacy.
Handle large text blocks and files efficiently with our optimized encoding algorithms and memory management.
Copy encoded/decoded results to clipboard or download as files for easy integration into your projects.
Embed images and files directly in CSS, HTML, or JavaScript using data URIs.
Encode binary attachments for transmission through email systems that only support text.
Store binary data in databases or configuration files that only accept text format.
Encode cryptographic keys, certificates, and other security tokens for transmission.
Send binary data through APIs that expect text-based payloads like JSON or XML.
Convert images to Base64 for embedding in web pages or storing in text-based formats.
| Encoding Method | Character Set | Size Increase | Common Use Cases | URL Safe |
|---|---|---|---|---|
| Base64 | A-Z, a-z, 0-9, +, / | ~33% | Email, Web, Data URIs | No (requires URL encoding) |
| Base64 URL Safe | A-Z, a-z, 0-9, -, _ | ~33% | URLs, Filenames | Yes |
| Hex Encoding | 0-9, A-F | 100% | Cryptography, Debugging | Yes |
| ASCII85 | 33-117 printable ASCII | ~25% | PDF, PostScript | No |
Base64 encoding increases data size by approximately 33% due to the encoding process. Plan your storage and bandwidth accordingly when working with large files.
When using Base64 in URLs or filenames, always use URL-safe encoding to avoid issues with special characters that might be misinterpreted by web servers or file systems.
Always validate Base64 strings before attempting to decode them. Look for proper padding and valid characters to avoid decoding errors.
For very large files, consider streaming the encoding/decoding process or using dedicated libraries to avoid memory issues in your applications.
When embedding Base64 data in data URIs, always include the proper MIME type to ensure browsers and applications can interpret the data correctly.