Encode or decode Base64.
Transform UTF-8 text without sending content to an external service.
🔒 Processed locallyYour input stays on this device and is never uploaded to Boring Tools.
Result
How to use Base64 Encoder & Decoder
Base64 represents bytes using printable ASCII characters. It is an encoding format, not encryption, and anyone can decode the result.
Steps
- Paste text or a Base64 value.
- Choose encode or decode.
- Copy the transformed output.
Formats, limits, and accuracy
This tool converts text with UTF-8, so Traditional Chinese, emoji, and other Unicode characters round-trip correctly.
Frequently asked questions
Is Base64 secure?
No. It provides no confidentiality or authentication.
Why is encoded text longer?
Base64 usually adds roughly one third to the byte length.
Practical notes
Use a cryptographic tool when confidentiality is required.
Malformed Base64 input produces an error instead of partial text.