Text encoding converter: Base64 and URL

Convert text to and from UTF-8 Base64 or URL percent encoding. Accented characters and emoji are handled as UTF-8. The conversion runs in this browser; do not treat encoding as a way to protect confidential information.

What is Base64?

Base64 represents bytes using a limited set of text characters. It is used in some APIs, email attachments and data URLs. It is an encoding format, not encryption.

The UTF-8 text “Olá mundo!” becomes “T2zDoCBtdW5kbyE=” in Base64.

What is URL percent encoding?

Percent encoding represents bytes that need escaping as a percent sign followed by two hexadecimal digits. Encode a value intended for one URL component, such as a query parameter; do not encode a whole URL as though it were one value.

For example, “Olá mundo!” becomes “Ol%C3%A1%20mundo!” with this tool.

When to use each format

• Base64 can carry binary data through text-only fields, for example in some API payloads or data URLs.
• Percent encoding helps place reserved characters safely inside an individual URL component.

Security and size limits

• Base64 is not encryption. Anyone with the encoded string can decode it; do not use it to hide passwords, tokens or personal data.
• Base64 usually increases the encoded size by about one third, before any surrounding format overhead.
• URL encoding changes representation; it does not authenticate, encrypt or make a destination trustworthy.
• This page converts text, not uploaded files.

Frequently asked questions