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Base64 decoding – Overview
Base64 decoding converts a Base64-encoded string back into its original form—text or binary. Useful when you receive or store data as Base64 and need to recover the content. Decoding runs in your browser; your data is not sent to any server. Paste a Base64 string or upload a file containing one.
When to use Base64 decoding vs other formats
Use the decoder when you have a Base64 string and need the original data. Use the encoder when you have text or a file and need to produce Base64. Decoding untrusted Base64 can expose malicious content; only decode data from trusted sources. For hashing verification, use a hash tool.
Compatibility
Standard Base64 (including padding with =) is supported. URL-safe Base64 can often be decoded after converting -_ back to +/. Invalid input will produce an error. All processing is client-side.
Quality considerations
Decoding is lossless when input is valid Base64. Garbage or truncated input may fail or produce wrong output. Never decode Base64 from untrusted sources without considering security (e.g. XSS, malicious file content).
Example use cases
- Decode data URIs or API responses to get the original file or text.
- Recover content from Base64 strings stored in configs or databases.
- Verify or inspect Base64-encoded payloads from logs or tools.
- Convert a Base64 string back to a file for download or use.
- Debug or test systems that use Base64 for transport or storage.
Powered by browser APIs and client-side processing.