How to use the Base64 Encoder
1. Choose the direction: click Encode to convert plain text or binary data to a Base64 string, or Decode to convert a Base64 string back to readable text.
2. Paste your input into the left text area. The tool supports the full UTF-8 character set including Unicode characters, so emoji, accented letters, and CJK characters all work correctly.
3. Click the action button at the bottom to run the conversion.
4. Click Copy in the output panel to copy the result to your clipboard, ready to paste into code, a config file, or an API request.
What is it?
Base64 is a binary-to-text encoding scheme defined in RFC 4648. It converts arbitrary binary data into a string made up of 64 printable ASCII characters: A–Z, a–z, 0–9, plus + and /, with = as a padding character. Every 3 bytes of input become exactly 4 Base64 characters, so encoded data is roughly 33% larger than the original.
The encoding solves a practical problem: many protocols (HTTP headers, JSON, XML, email) are designed to transport text and may corrupt or truncate arbitrary binary data. By encoding binary as ASCII-safe text first, you can safely embed it anywhere text is expected. Common use cases include embedding images directly in CSS as data: URIs, encoding API credentials in HTTP Basic Authentication headers (Authorization: Basic dXNlcjpwYXNz), transmitting binary payloads in JSON API responses, and storing binary blobs as string columns in databases that lack a native binary type.
It is important to understand that Base64 is encoding, not encryption. It provides zero confidentiality — any developer who sees the string can decode it instantly with a single function call. If you need to protect data in transit, use HTTPS. If you need to protect data at rest, use proper encryption (AES-GCM, for example). Base64 is purely a data representation format.
Example
Hello, World!
SGVsbG8sIFdvcmxkIQ==
Decoding works the same way in reverse — paste the Base64 string and switch to Decode mode.
Benefits
Encode binary data for safe transport in JSON and HTTP headers
Base64 eliminates binary content corruption when passing data through text-based protocols, email, and API fields.
Decode Basic Auth credentials from HTTP headers
The Authorization: Basic header is just Base64-encoded username:password — decode it instantly without writing code.
Embed small images and fonts as data URIs in CSS
Inline small assets as Base64 data URIs to eliminate extra HTTP requests for icons, fonts, and background images.
Verify Base64 content from logs and API responses
Decode encoded values from server logs or API responses to confirm what the content contains before passing it to your app.
Frequently asked questions
Is Base64 encryption?
No. Base64 is purely an encoding scheme — it is not encryption and provides no security whatsoever. Anyone can decode it in one line of code. Never use Base64 to 'hide' passwords, secrets, or sensitive data.
Why does my Base64 string end with == or =?
The == or = characters are padding. Base64 encodes 3 bytes at a time into 4 characters. If the input is not a multiple of 3 bytes, padding characters are added to make the output length a multiple of 4. They are part of the standard and should be kept.
Does this tool handle Unicode and emoji correctly?
Yes. We first encode the string as UTF-8 using encodeURIComponent before converting to Base64, which correctly handles all Unicode characters including emoji, CJK characters, and accented letters. Some older Base64 tools only handle ASCII, which causes garbled output for non-ASCII input.
What is URL-safe Base64?
Standard Base64 uses + and / which have special meaning in URLs. URL-safe Base64 (used in JWTs, for example) replaces + with - and / with _, and omits the trailing = padding. If you are encoding data for use in a URL or filename, you should use URL-safe Base64.
How do I encode a file to Base64?
In the browser you can use the FileReader API with readAsDataURL(). In Node.js: Buffer.from(fileBuffer).toString('base64'). In Python: base64.b64encode(open('file', 'rb').read()).decode(). This text-based tool is best suited for encoding text strings, not large binary files.