Encoding
Base64 Encode
Encode plain text into Base64.
Encoding
Base64 Decode
Decode a Base64 string back to plain text. Useful for inspecting JWT payloads, decoding values from HTTP headers, or reading data URLs.
도구 요약
이 도구는 구조화된 입력을 받아 서버 업로드 없이 브라우저에서 결정적인 출력을 반환합니다.
- 도구 이름
- Base64 Decode
- 입력 의도
- 변환·검증·분석할 원본 콘텐츠를 제공하세요.
- 출력 의도
- 복사, 재사용 또는 디버깅에 적합한 정규화된 출력을 받습니다.
- 예시 입력
- SGVsbG8sIHdvcmxk
- 예시 출력
- Hello, world
Decoded text will appear here after you click Decode.
도구 소개
Decode a Base64 string back to plain text. Useful for inspecting JWT payloads, decoding values from HTTP headers, or reading data URLs.
도구 개요
Base64 is a reversible encoding that maps every 3 bytes of input to 4 ASCII characters. This tool reverses that mapping and renders the result as UTF-8 text. If the input contains characters outside the Base64 alphabet, or the length is wrong, decoding fails and the tool reports "Invalid Base64".
사용 사례
- Use Base64 Decode when you need fast decode base64 back to readable text.
- Handle encoding workflows directly in the browser with no install required.
- Support SEO long-tail intent by covering quick checks, troubleshooting, and one-off conversions.
입력/출력 예시
입력 의도
SGVsbG8sIHdvcmxk
출력 의도
Hello, world
자주 묻는 질문
What does "Invalid Base64" mean?+
The input contains characters outside the Base64 alphabet (A–Z, a–z, 0–9, +, /, =), or its length is not a multiple of four after padding.
Can it decode binary files?+
This tool decodes to UTF-8 text. Binary data (images, archives) will appear as gibberish; for those, use a desktop tool that writes the result to a file.
Does it support URL-safe Base64?+
It uses the standard alphabet. URL-safe Base64 replaces + with - and / with _ — convert those characters back before pasting.
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