How it works
UTF-8 text ↔ RFC 4648 Base64. Not encryption.
Input definitions
- Text or Base64
- Plain text; maximum 200,000 characters.
- Operation
- Choose Encode / Decode.
A worked example
- Text or Base64
- Hello world
- Operation
- Encode
Assumptions & limits
Unicode plain text only. No input is uploaded. Maximum 200,000 characters.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Is Base64 encryption?
No. Base64 is a reversible encoding of bytes. It does not hide the original information from anyone who can decode it. This tool encodes UTF-8 text.
Does this tool execute the code or data I paste?
Inputs are treated as data under the stated parser or transformation. Output is displayed as text. Parsing or formatting does not establish that the content is safe to execute elsewhere.
How does the Base64 text codec tool work?
UTF-8 text ↔ RFC 4648 Base64. Not encryption.
What are the assumptions and limits of Base64 text codec?
Unicode plain text only. No input is uploaded. Maximum 200,000 characters.