SearchCtrl K
WarpTool
Code & DataText ToolsImage & MediaFont StylesSEO & Web
Back

Base64 Encode & Decode

Encode binary/text into Base64 format or decode Base64 strings back to text.

100% Client-Side Local Execution
Input Data
1
Transformed Result
1

What is Base64 Encode & Decode?

This tool handles both base64 encode and base64 decode in one place, converting text or binary data to and from Base64's ASCII-safe representation. It's the browser equivalent of calling btoa() and atob() in JavaScript, useful for embedding images in CSS/HTML, preparing auth tokens, or inspecting a Base64 string you received from an API. A complete base64 converter for everyday developer tasks.

Technical Execution

Base64 encoding takes raw binary data (or text converted to bytes) and maps every 3 bytes into 4 printable ASCII characters drawn from a 64-character alphabet (A-Z, a-z, 0-9, +, /), padding with = when needed. Decoding reverses the process, mapping each group of 4 characters back to the original 3 bytes, recovering the exact original data.

Zero Data Storage Guarantee

Base64 is often used to carry API tokens, authentication headers, or embedded file data, which can be sensitive even though it's not encryption. This tool performs encoding and decoding entirely in your browser using native Base64 routines, so your input is never transmitted anywhere.

How to Use Base64 Encode & Decode (Step-by-Step Guide)

  1. Paste your text or Base64 string into the input field
  2. Choose encode (text to Base64) or decode (Base64 to text)
  3. The tool converts the input instantly
  4. Review the resulting encoded or decoded output
  5. Copy the result for use in your code, config, or request

Frequently Asked Questions (FAQ)

Q: What's the difference between base64 encode and base64 decode?
A: Encode converts readable text or binary data into the Base64 ASCII format; decode reverses that process, turning a Base64 string back into its original content.
Q: Is Base64 the same as encryption?
A: No, Base64 is not encryption or security — it's just a reversible encoding scheme anyone can decode, so it should never be used alone to protect sensitive data.
Q: Is this base64 encode decode online tool free?
A: Yes, completely free with no account or sign-up.
Q: Does this work like btoa and atob in JavaScript?
A: Yes, the encode and decode operations match JavaScript's built-in btoa() and atob() functions, but this tool also handles UTF-8 text that those functions can choke on directly.
Q: Why does my decoded Base64 to text look like garbage?
A: This usually happens if the input wasn't valid Base64 to begin with, or if it represents binary data (like an image) rather than plain text, which won't display as readable characters.
Q: What's the equal sign (=) at the end of my Base64 string for?
A: It's padding, added when the input length isn't a multiple of 3 bytes, ensuring the encoded output's length is a multiple of 4 characters.
Q: Can I encode an image or file, not just text?
A: Text-based Base64 tools typically work on pasted text; for binary files like images, you'd need a file-upload-capable Base64 encoder rather than a text paste box.
Q: Is Base64 URL-safe by default?
A: No, standard Base64 includes + and / characters that aren't URL-safe; a separate URL-safe Base64 variant replaces those with - and _ when needed for use in URLs.
Report an issue with this tool