Base64 Encode & Decode은(는) 무엇을 하나요?
Base64 Encode & Decode은(는) 브라우저에서 콘텐츠 인코딩 또는 디코딩을(를) 수행하며 결과와 제한을 명확히 설명합니다. 검증된 기능: UTF-8 text encoding, File input up to 50 MB, Base64URL alphabet, Binary download.
Choose Base64URL for URL-safe values
Use standard Base64 for MIME and general byte transport. Use Base64URL for URL components and JWT segments where +, /, and padding are inconvenient.
사용 방법
- Choose Encode or Decode.
- Enter text, paste Base64, or select a local file; enable the URL-safe alphabet when required.
- Copy text output or download decoded binary bytes.
실제 입출력 예시
Encode UTF-8 text
입력
Hello출력
SGVsbG8=The five UTF-8 bytes are represented by eight Base64 characters including padding.
일반적인 오류와 해결 방법
| 현상 | 가능한 원인 | 해결 방법 |
|---|---|---|
| Decode reports invalid Base64. | The alphabet, padding, or copied characters are wrong. | Choose the matching standard or URL-safe alphabet and restore valid padding when required. |
| Decoded output looks corrupted. | Binary bytes are being previewed as UTF-8 text. | Download decoded.bin instead of relying on the text preview. |
Base64 changes representation, not trust
이 도구의 구체적인 제한: Base64 usually adds about one third to binary size because four encoded characters represent three source bytes. Anyone can decode it without a key.
표준 및 구현 참고 자료
- RFC 4648 — Base-N Encodings (opens in a new tab)Defines Base64 and the URL-safe alphabet.
Base64 — FAQ
Does Base64 encrypt data?
No. Base64 is reversible encoding and provides no secrecy or authentication.
What is Base64URL?
Base64URL replaces + and / with - and _ and commonly omits padding.
Can it encode a file?
Yes. A selected file up to 50 MB is encoded in the current browser tab.
변경 사항
실질적인 업데이트: Base64: Added UTF-8 text conversion, local file encoding up to 50 MB, Base64URL mode, validation, copy, and decoded binary download.