Base64 Decoder
Turns Base64 back into readable text when the data is valid text. It is for inspecting samples, headers, tokens, and encoded snippets.
Runs in your browser. Input, settings, and results are not sent to Utilio servers.
Base64 Decoder
Local browser processing. Data stays on this device.
Result
Decoded
Base64 was decoded: 28 -> 15 characters.
What Base64 Decoder does
Use Base64 Decoder when you need to decode a sample value from docs or logs.
When to use it
- Decode a sample value from docs or logs.
- Inspect URL-safe Base64 strings during debugging.
- Check whether an encoded value is plain text or binary data.
How to use it
- Paste the Base64 value.
- Select URL-safe mode when the value uses URL-safe characters.
- Read the decoded text or error message.
What to check
- Decoded output may still be another format such as JSON, JWT, or binary.
- Never paste private keys or production secrets just to inspect them.
Data, formats, and limits
What stays on your device and what is sent
Runs in your browser. Input, settings, and results are not sent to Utilio servers.
Supported formats
This tool works with typed or generated values rather than uploaded files.
File limits and browser requirements
- Use an up-to-date browser and check the result on the device where you will use it.
Known limits
- This tool helps inspect or transform data, but it does not replace code review, security review, or production configuration checks.
- Do not paste real secrets, tokens, or private keys into data you are not prepared to expose in the browser.
Troubleshooting
- If validation fails, start with quotes, commas, brackets, whitespace, and input encoding.
- If the result is unexpectedly empty, check the tool mode and a minimal example without extra fields.
- Do not paste real tokens, passwords, or keys; use a test snippet with the same format for diagnosis.
Common questions
What does Utilio receive?
Runs in your browser. Input, settings, and results are not sent to Utilio servers.
What is it useful for?
Use it when you need to decode a sample value from docs or logs. Start by pasting the Base64 value.
Do I need an account?
No. You can use this tool without creating an account.
Can I use it on a phone?
Yes. The tool works in a mobile browser, though longer input or detailed results may be easier to review on a larger screen.
How do I get a reliable result?
Paste the Base64 value. Then select URL-safe mode when the value uses URL-safe characters. Decoded output may still be another format such as JSON, JWT, or binary.
Does Utilio use my input or results to train AI?
No. Utilio does not use files, pasted text, settings, generated values, or results from this tool to train AI models.