Base64 Encoder/Decoder
Encode or decode text to/from Base64
The Base64 Encoder/Decoder converts text and binary data to and from Base64-encoded ASCII strings instantly in your browser. Base64 encoding is essential for embedding images as data URIs, constructing API authentication headers, decoding JWT tokens, and transmitting binary content through text-only channels like email. Full UTF-8 support ensures accurate handling of all Unicode characters.
๐ How to Use
- Enter the text you want to encode or decode
- Click the Encode button to convert to Base64
- Click the Decode button to restore original text
- Copy the result for your use
โจ Features
- โReal-time encoding/decoding
- โFull UTF-8 Unicode support
- โHandles large text inputs
- โOne-click copy functionality
- โFast processing speed
๐ก Use Cases
- โขFrontend Developers: Convert small images or fonts to data URIs to reduce HTTP requests and improve page load performance.
- โขBackend Developers: Encode username:password pairs for HTTP Basic Authentication headers in REST API requests.
- โขSecurity Analysts: Decode the payload section of JWT tokens to quickly inspect claims and expiration data.
- โขDevOps Engineers: Decode Base64-encoded values stored in Kubernetes Secrets or CI/CD environment variables for configuration audits.
- โขEmail Administrators: Decode MIME-encoded email attachments and inline content to verify the original data.
๐ฏ Tips
- โธTo inspect a JWT, paste only the second segment (between the two dots) to decode the payload claims instantly.
- โธBase64 increases data size by approximately 33%, so use it for small assets like icons rather than large files.
- โธFor URL-safe Base64, replace + with - and / with _ in the output.
- โธIf decoded text appears garbled, the original data may not be UTF-8 โ verify the source encoding first.
โ FAQ
Q. What is Base64?
A. Base64 is an encoding method that converts binary data into text format. It's commonly used for email attachments and data URLs.
Q. Does it support non-English characters?
A. Yes, it uses UTF-8 encoding to support all Unicode characters including non-Latin scripts.
Q. Is Base64 the same as encryption?
A. No. Base64 is an encoding scheme, not encryption. Anyone can decode a Base64 string without a key. Never use it to protect passwords or sensitive information.
Q. How much does Base64 increase data size?
A. Base64 increases the data size by roughly 33%. Every 3 bytes of binary data become 4 ASCII characters. Consider this overhead when embedding large assets.
Q. What is URL-safe Base64?
A. Standard Base64 uses +, /, and = characters that have special meanings in URLs. URL-safe Base64 replaces + with - and / with _ so the encoded string can be used safely in URL paths and query parameters.
Q. Can I encode large files with Base64?
A. Technically yes, but it is inefficient due to the 33% size overhead. For images, data URIs are best suited for small icons under 1โ2 KB. Larger files should be served as regular binary downloads.