Base64 Encoder / Decoder

Encode and decode Base64 strings online

Developer Tools

How to Use Base64 Encoder / Decoder

  1. 1Select whether you want to Encode or Decode
  2. 2Enter your text in the input field
  3. 3The result appears instantly in the output field
  4. 4Click "Copy" to copy the result to your clipboard
  5. 5Use "Swap" to quickly switch input and output

About Base64 Encoder / Decoder

Base64 is a binary-to-text encoding scheme widely used in data transmission, email encoding, and web APIs. Our Base64 Encoder/Decoder tool makes it easy to encode plain text to Base64 or decode Base64 strings back to readable text.

Base64 encoding is commonly used in data URIs for images, HTTP Basic Authentication, embedding binary data in JSON/XML, and many other web development scenarios.

Key Features of Base64 Encoder / Decoder

  • Fast and accurate Base64 Encoder processing
  • No installation required — works in browser
  • Free to use with no limitations
  • Privacy-focused — data never leaves your device
  • Mobile and desktop compatible
  • Instant results with live preview

Supported Formats

Input Formats

Plain textUTF-8 stringsBase64-encoded strings

Output Formats

Base64 (standard RFC 4648)Decoded plain text

For encoding binary files (images, PDFs), use the Image to Base64 tool instead.

Examples

Encode a string to Base64

Useful for HTTP Basic Auth headers.

Input

user:secretpassword

Output

dXNlcjpzZWNyZXRwYXNzd29yZA==

Decode a Base64 JWT payload

Base64 decode the middle segment of a JWT token.

Input

eyJ1c2VySWQiOjEyMywicm9sZSI6ImFkbWluIn0=

Output

{"userId":123,"role":"admin"}

Common Use Cases

  • Professional Base64 Encoder tasks
  • Quick everyday calculations
  • Educational purposes and learning
  • Business and workplace productivity
  • Personal projects and hobbies
  • Decoding Base64 strings received from third-party APIs

Troubleshooting

Invalid Base64 string — incorrect padding

Solution

Base64 strings must have a length that is a multiple of 4. Missing = padding characters at the end cause this error. Add one or two = characters to fix it.

Output contains garbled characters

Solution

The decoded text may be binary data, not readable text. If you are decoding an image or file, use the Base64 to Image tool instead.

URL-safe Base64 does not decode correctly

Solution

URL-safe Base64 uses - and _ instead of + and /. Enable the URL-safe option or replace those characters manually before decoding.

Frequently Asked Questions

What is Base64 encoding?

Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters. It's used to safely transmit data over text-based protocols.

When should I use Base64?

Use Base64 when you need to embed binary data in text formats like JSON or XML, or when transmitting data over channels that only support text.

Does Base64 encrypt my data?

No. Base64 is encoding, not encryption. Anyone with a Base64 decoder can read the original content. Never use Base64 to protect sensitive data.

Why does Base64 output end with == or =?

Base64 pads output to a multiple of 4 characters using = signs. One or two = characters may appear depending on the input length.

Can I encode images to Base64?

For images, use the dedicated Image to Base64 tool which handles binary file input. This tool is optimized for text strings.

What is URL-safe Base64?

URL-safe Base64 replaces + with - and / with _ so the encoded string can be safely used in URLs and filenames without percent-encoding.