Quick instructions
Choose direction and alphabet, paste text and convert. Copy the output or save TXT.
Text
Base64 encode & decode
Convert Unicode text to Base64 or Base64URL and restore valid UTF-8 text. Free, no sign-up, right in your browser.
Free · No sign-up · No subscriptionWorkspace
Locally in your browserResult
Ready when you are.Your result will appear here after processing.
Questions about this tool
How does this tool work: Base64 encode & decode?
Free, no sign-up, right in your browser. Choose direction and alphabet, paste text and convert. Copy the output or save TXT.
Are Base64 contents secret?
No. Base64 only changes how bytes are represented and can be reversed without a key. Do not use it to protect passwords or other secrets.
What inputs, outputs and limits apply?
Input: Text or Base64; standard or URL alphabet. Output: Encoded or decoded text and TXT download. Limits: Max. 200,000 text characters or 800,000 Base64 characters. Text is encoded as UTF-8; binary data is not valid text. Spaces and line breaks in Base64 are ignored. Base64 is not encryption.
Instructions, example and file limits
Formats, inputs and limits
- Input
- Text or Base64; standard or URL alphabet
- Output
- Encoded or decoded text and TXT download
- Limits & notes
- Max. 200,000 text characters or 800,000 Base64 characters. Text is encoded as UTF-8; binary data is not valid text. Spaces and line breaks in Base64 are ignored. Base64 is not encryption.
Practical example
Hello becomes SGVsbG8= in the standard alphabet.
Additional notes
Good to know
These tools do not send your inputs to a server. Your web host processes technical connection data when you visit the site.
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