Base64 Decoder
Decode Base64 strings.
100% private Runs locally No sign-up
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Heavy libraries load on demand so the page shell stays fast.
About Base64 Decoder
Base64 Decoder turns Base64 strings back into text or downloadable files in your browser — handy for debugging data URLs and API payloads without pasting secrets into a public decoder.
How to use Base64 Decoder
- 1Paste the Base64 string (strip data-URL prefixes if needed).
- 2Decode locally.
- 3Inspect text output or download binary when offered.
- 4Never decode untrusted payloads that could be treated as executable code elsewhere.
Frequently asked questions
Invalid character errors?
Remove whitespace/newlines or URL-safe variants may need translation from -/_ to +/ before decode.
Encode instead?
Use Base64 Encoder for the reverse direction.
Images as Base64?
Decoded binaries can be saved as PNG/JPG if the bytes are a valid image. Large data URLs may strain memory.
Security?
Base64 is encoding, not encryption. Anyone can decode — do not treat it as protection.
JWT parts?
JWTs use Base64URL. Prefer JWT Decoder for token payloads.