Base64 Encoder & Decoder - Free Online

How the Base64 Encoder Works

1. 01Paste or type your text in the input field
2. 02Choose Encode to convert text to Base64, or Decode to convert Base64 back to text
3. 03The result appears instantly
4. 04Copy the output to your clipboard

What Base64 Encoding Is Used For

Base64 encoding converts binary data into ASCII text, making it safe to transmit through systems that only handle text. Common uses include embedding small images directly in HTML or CSS (data URIs), encoding email attachments (MIME), and passing binary data in JSON APIs. Note that Base64 is not encryption - it's easily reversible and provides no security.

When to Use Base64 Encoding

Use Base64 encoding to embed binary data (images, files) in text-based formats like HTML, CSS, JSON, or email. Common use cases include embedding small images directly in HTML or CSS (data URIs), encoding file attachments in email (MIME), sending binary data through REST APIs, and encoding authentication credentials for HTTP Basic Auth headers.

Common Use Cases

• ·Embed small images as data URIs in HTML or CSS to save HTTP requests → Compress Images Online
• ·Encode file attachments for email transmission (MIME encoding)
• ·Create HTTP Basic Authentication headers by encoding username:password → Hash Generator
• ·Decode Base64-encoded JWT token segments for debugging → URL Encoder & Decoder
• ·Pass binary data through JSON APIs that only support text values

Expert Tips

• ✻Only embed images as Base64 data URIs if they are under 10 KB - larger Base64 strings bloat your HTML and cannot be cached separately by browsers
• ✻Base64 is encoding, not encryption - anyone can decode it instantly, so never use it to protect sensitive data
• ✻When using Base64 in URLs, use the Base64url variant (replacing + with - and / with _) to avoid conflicts with URL special characters

Frequently Asked Questions