Overview
Base64 is an encoding format, not encryption. This decoder converts Base64 input back into the original data whenever the text is valid and complete. If the input contains line breaks, URL-safe characters, or missing padding, the result may differ or fail depending on the source format. Use it for text snippets, file payloads, JSON fragments, and encoded headers. If the decoded output is non-text data, the tool will still show the raw result or bytes rather than forcing unreadable characters into plain language. For best results, paste the exact encoded value from the source system. Extra spaces, copied prefixes, or truncated strings are the most common reasons a Base64 decode does not match expectations.
Use cases
- Decode API payload fragmentsTurn Base64-encoded fields from API responses into readable text so you can inspect IDs, messages, or nested values.
- Read file content embedded in textConvert encoded file chunks or attachments back into their original bytes or text for debugging and verification.
- Check email or token dataInspect encoded values from headers, tokens, or signed strings to see what was actually stored.
- Recover pasted snippets from logsDecode values copied from logs, config files, or terminal output when the source system stores data in Base64.
How it works
- 1
Paste the Base64 value into the input field.
- 2
The tool decodes the content and shows the output immediately.
- 3
Copy the decoded text or inspect the raw output if the data is not plain text.
Examples
Plain text message
Input: aGVsbG8gd29ybGQ=
Output: hello world
A standard Base64 string decoded back into readable text.
JSON fragment
Input: eyJzdGF0dXMiOiJvayIsImNvZGUiOjIwMH0=
Output: {"status":"ok","code":200}
Decodes a structured JSON snippet without changing its content.
Multiline input
Input: U2Vj cmV0 IHZhbHVl
Output: Secret value
Shows that wrapped input can still decode when the encoded data is complete.
FAQ
Why does my output look like symbols or unreadable text?
That usually means the decoded bytes are not plain text. The source may be an image, archive, or other binary payload, so the output should be treated as raw data.
What happens if the string has missing padding?
Some Base64 values decode only when padding is restored. If the source trimmed the trailing '=' characters, the result may be rejected or need the exact original form.
Can I decode URL-safe Base64 here?
URL-safe strings use different characters in some systems. If your value was copied from a URL token, make sure it is in the format expected by the source before decoding.
Why is my result different from the original text?
A mismatch usually comes from copying extra spaces, losing characters, or decoding the wrong variant. Check the full string exactly as it appeared in the source.