What problem does this tool solve?
Base64 represents binary bytes or text using an ASCII-compatible alphabet. This free encoder and decoder handles UTF-8 text and can encode a supported local file directly, without confusing encoding with encryption.
Six practical questions answered
How do I convert text to Base64?
Enter the text and choose Encode. The tool converts the characters to UTF-8 bytes and then generates standard Base64.
How do I decode a Base64 string?
Paste the string in text mode and select Decode. If the decoded bytes form valid UTF-8 text, the original text is displayed. Binary data is reported instead of being shown as misleading text.
Can I Base64-encode accented characters and non-English text?
Yes. UTF-8 supports accented characters, including ä, ö, ü, and ß, as well as many other writing systems and emoji.
Why does Base64 contain plus signs, slashes, and equals signs?
The + and / characters belong to the standard Base64 alphabet. An equals sign is padding used at the end of some encoded values.
How can I detect invalid Base64 input?
The decoder checks the standard alphabet, padding, and canonical encoding before decoding UTF-8. Invalid encodings or nontext bytes produce an error.
Can I encode a local file as Base64?
Yes. Select binary file mode and open a local file up to 2 MB. The encoder processes its bytes directly. Base64 output is larger than the original data, so file-size and memory limits apply.
Practical example
A developer needs a short UTF-8 text value in a format that expects Base64. They encode it, decode it once to check the round trip, and copy the encoded value into the intended field.
How to use the tool
Paste text or standard Base64 and choose the direction. To encode a file, select binary file mode, open it locally, and encode its bytes. Copy or download the output.
Additional use cases
- Encode a UTF-8 text sample.
- Read Base64 content from your own configuration.
- Check an accented-text and emoji round trip.
Limits and supported formats
Text limit: 500,000 characters. Binary file encoding: up to 2 MB. Decoding supports standard Base64 to valid UTF-8 text only, not binary file output or Base64url. Base64 is not encryption.
Frequently asked questions
Is Base64 encryption?
No. Base64 is a reversible encoding, not protection against unauthorized reading. It does not make confidential information secure.
Does the Base64 conversion need an internet connection?
The conversion itself runs locally once the page and its code have loaded. No external conversion request is made.
Does the text encoder support Unicode?
Yes. Text is encoded as UTF-8 before it is converted to Base64.
Can any Base64 value be displayed as readable text?
No. Decoded bytes may represent an image, PDF, or other binary format. This text decoder rejects invalid UTF-8 instead of substituting corrupted characters.
Is the Base64 tool free?
Yes. Text conversion and local file encoding are free and do not require an account.
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Request a free consultation (German form) →Editorial team: SEOSTUDIO · Updated November 9, 2026