English interface
UTF-8 Base64 text converter
Encode or decode standard Base64 text locally, including Thai and emoji.
ReviewedGeneral utility
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 examples 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 2026-09-09Recorded updates
Site changelogReview history
Dates describe the review scope recorded below. A page update does not mean every source was checked again.
- Last recorded source/method review
Core calculations, cited sources and main examples have been reviewed within the stated scope.