Base64 Encoder / Decoder
Encode text or files to Base64, or decode Base64 strings back to plain text.
Base64 Encoder & Decoder
Instantly convert plain text to Base64 format and vice versa. Fully client-side and UTF-8 safe.
Plain Text Input
Base64 Output
Output will appear here automatically
Common Problems
How to decode a Base64 string online?
This tool encodes and decodes Base64 instantly in your browser. For decoding, provide a valid Base64 string. Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email.
How to encode text to Base64?
Yes. The encoder handles full Unicode by using TextEncoder internally before converting to Base64.
How to decode a JWT token payload?
Decoding JWT token payloads to inspect claims. Select Encode or Decode mode, paste your input, and click the action button. Output: SGVsbG8sIFdvcmxkIQ== Decode: Input: U0VDUkVU Output: SECRET Everything runs locally in the browser, which keeps the workflow fast and privacy-friendly.
How to convert image to Base64 data URI?
Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email.
How to decode Base64 environment variables?
Decoding Base64-encoded environment variables. This tool encodes and decodes Base64 instantly in your browser. Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email.
What does a Base64 string look like?
Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email. For decoding, provide a valid Base64 string. Why does my decoded output look garbled? Everything runs locally in the browser, which keeps the workflow fast and.
Workflow
What is Base64 Encoder / Decoder?
Base64 converts binary data into 64 printable ASCII characters, making it safe to transmit through text-only channels like HTTP headers, JSON, and email. This tool encodes and decodes Base64 instantly in your browser.
How to use Base64 Encoder / Decoder
Select Encode or Decode mode, paste your input, and click the action button. For encoding, any UTF-8 text including Unicode characters is accepted. For decoding, provide a valid Base64 string.
Example
Encode:
Input: Hello, World!
Output: SGVsbG8sIFdvcmxkIQ==
Decode:
Input: U0VDUkVU
Output: SECRETUse Cases
1. Decoding JWT token payloads to inspect claims.
2. Embedding small images as data URIs in HTML or CSS.
3. Encoding credentials for HTTP Basic Auth headers.
4. Passing binary data through JSON APIs.
5. Decoding Base64-encoded environment variables.
FAQ
Is Base64 the same as encryption?
No. Base64 is an encoding scheme — it is trivially reversible and provides zero security. Use it for format compatibility, not secrecy.
Does it support Unicode and emoji?
Yes. The encoder handles full Unicode by using TextEncoder internally before converting to Base64.
Why does my decoded output look garbled?
The original data may not have been text — it might be a binary file (image, PDF). Base64 is not limited to text.