Base64 Encoder & Decoder - Free Online

Encode any text to Base64 or decode Base64 back to readable text. Handles UTF-8 correctly. Free, instant, no account.

Operation

Mode

URL-safe: - and _ instead of + and /

0 characters

Input is never stored, logged, or shared.

How to Use Base64 Encoder & Decoder

Enter InputPaste or type your text or Base64 string into the textarea

Choose OperationSelect Encode or Decode, and Standard or URL-Safe mode

Convert & CopyClick the button to convert and copy the result

Base64 Encoder & Decoder - Free Developer Utility

Base64 Encoder and Decoder - convert text to Base64 encoding or decode Base64 strings back to plain text instantly. Base64 is an encoding scheme that represents binary data as ASCII text using 64 printable characters. Developers use it constantly: embedding images in HTML or CSS data URIs, encoding credentials in HTTP Authorization headers, passing binary data through JSON APIs, and storing binary content in XML or text-based formats. Our tool handles UTF-8 encoding correctly, which matters when encoding text containing accented characters, emojis, or non-Latin scripts. The base64 encode output is fully compatible with all major programming languages. The base64 decode reliably reverses any valid Base64 string.

Keywords and Common Use Cases

Developers search for this tool using terms like: base64 encode, base64 decode, base64 converter, encode to base64, decode base64. Used by backend developers, frontend engineers, DevOps professionals, and students working on web projects.

Zero Data Retention Policy

Every input you enter is processed in memory and immediately discarded. We do not log inputs, store results, or send your data to any third party. Code, API tokens, passwords, and sensitive strings remain completely private.

Frequently Asked Questions

Base64 is used to safely transmit binary data through text-based channels. Common: HTTP Basic Auth headers in the format Authorization: Basic base64(user:pass), data URIs for embedding images in HTML/CSS, and API payloads carrying binary content as text.

No. Base64 is encoding, not encryption. Anyone with a base64 decode tool can retrieve the original text instantly. Never use it to protect sensitive data.

Base64 converts every 3 bytes of input into 4 characters of output. This 4/3 ratio means the encoded text is always approximately 33% larger than the original data.

Standard Base64 uses + and / which break URLs. URL-safe Base64 replaces + with - and / with _ so the encoded string can be used in query parameters and file names.

If the original Base64 encoded binary data like an image file, the decoded output will be binary - not readable text. Base64 decode only produces readable text when the original input was text.