English interface
UTF-8 Base64 text converter
Encode or decode standard Base64 text locally, including Thai and emoji.
ReviewedLow-impact
Saves this tool's name on this device only (up to 20). No form values.
Only visible result text is included. Form fields are not read. Review sensitive values before sharing.
How to use it
- Select encode or decode.
- Enter UTF-8 text or padded standard Base64.
- Process and copy the result.
Important limitation
Base64 is not encryption. Only valid UTF-8 text up to 100,000 bytes is supported; whitespace, Base64URL and binary files are not accepted.
The interactive form is fully localized in English.
Reviewed 2026-09-09; next review 2027-09-09.
Core calculations, cited sources and main test cases have been reviewed within the stated scope.
Sources
RFC 4648 — Base64 and test vectorsIETF / RFC Editor · opens in a new tabSupports the method and scope stated on the tool page; consult the source for case-specific rules.Source checked 2026-09-09Encoding Standard — UTF-8WHATWG · opens in a new tabSupports the method and scope stated on the tool page; consult the source for case-specific rules.Source checked 2026-09-09Traceable review record
Site changelogReview history
This is the recorded review history available in the repository, not an inferred release history. Dates are added only when evidence is recorded.
- Current review snapshot recorded
Core calculations, cited sources and main test cases have been reviewed within the stated scope.
Method version: review-2026-09-09