Utility Box

Base64 Encoder/Decoder

Fast and secure online Base64 Encoder & Decoder. All calculations are executed strictly client-side inside your browser for 100% data privacy.

※ Base64 is an encoding method for safe text-based transmission. It is NOT encryption. Do not use it as a security measure for sensitive data.

Usage Tips

Check the Base64 conversion direction for text and files first

Choose encoding when you want to turn text or an image into Base64, and choose decoding when you want to check the original data from a Base64 string. You can use it for API testing, Data URI creation, and development checks, but Base64 is not encryption, so it should not be used to protect sensitive information.

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What is Base64 Encoder/Decoder?

The Base64 Encoder/Decoder converts text and binary file data into safe ASCII strings (encode) and restores them back (decode). It is essential for text-based environments such as HTML, CSS, email systems, and API payloads where data integrity must be preserved.

How to Use

  1. 1Use the Text Encode/Decode tab and paste plain text or Base64 input.
  2. 2Choose the target character set and final newline separator required by your destination system.
  3. 3Generate output with Encode/Decode and copy results instantly.
  4. 4In the Image tab, upload files to create Data URI Base64 strings, or paste Base64/Data URI text to decode and verify with preview.

Reference Knowledge

  • ●Base64 is encoding, not encryption—use cryptography separately for sensitive data.
  • ●Data URI format: data:[mime-type];base64,[data]
  • ●76-character wrapping helps when compatibility with MIME-style transport is needed.
  • ●All processing runs locally in your browser without server-side storage.

FAQ

Q.What is Base64 encoding and why is it used?

A.

Base64 is an encoding algorithm that converts complex data—such as binary files (images, audio) or text with special characters—into a safe string of 64 printable ASCII characters. It is primarily used to ensure that data remains intact without corruption when transferred over text-based protocols like HTTP, HTML, or email systems.

Q.Can I convert image files into Base64 as well as text?

A.

Yes, absolutely! In addition to encoding and decoding standard text strings, you can upload image files (PNG, JPG, SVG, etc.). Our tool will instantly convert your file into a Base64 "Data URI" string, which you can easily copy and paste directly into your HTML <img> tags or CSS background-image properties.

Q.Is my text and file data secure during the conversion?

A.

100% secure. Our Base64 Encoder/Decoder processes everything entirely locally within your web browser (client-side). Your text inputs and uploaded files are never sent to, processed by, or stored on any external servers. You can safely encode and decode sensitive data or proprietary code with complete peace of mind.

Q.Does Base64 encoding make data secure?

A.

No. Base64 is an encoding format, not encryption. Sensitive data still needs proper encryption or access control.