Question 1

What is Base64 encoding?

Accepted Answer

Base64 is a binary-to-text encoding scheme that represents binary data as ASCII characters. It uses 64 characters (A-Z, a-z, 0-9, +, /) to encode data, making it safe to transmit over text-based protocols like email or embed in HTML/CSS.

Question 2

How do I encode text to Base64?

Accepted Answer

Simply paste your text in the input field and select 'Encode' mode (or use Auto-Detect). The tool instantly converts your text to its Base64 representation. You can then copy the result with one click.

Question 3

How do I decode a Base64 string?

Accepted Answer

Paste the Base64 string in the input field. The tool auto-detects Base64 content and decodes it to readable text. You can also manually select 'Decode' mode to force decoding.

Question 4

What is a Base64 Data URI?

Accepted Answer

A Data URI (e.g., 'data:image/png;base64,...') embeds file content directly in HTML or CSS. Instead of linking to an external file, the Base64-encoded data is included inline, reducing HTTP requests.

Question 5

How do I convert an image to Base64?

Accepted Answer

Switch to the Image tab, then drag and drop an image file or click to select one. The tool reads the file and generates a complete Data URI with the correct MIME type that you can copy and use in HTML or CSS.

Question 6

What is URL-safe Base64?

Accepted Answer

URL-safe Base64 replaces '+' with '-' and '/' with '_', and removes padding '=' characters. This makes the encoded string safe to use in URLs and filenames without additional percent-encoding.

Question 7

Is there a size limit for Base64 encoding?

Accepted Answer

This tool runs entirely in your browser, so there's no server-side limit. However, very large files (over 10MB) may slow down your browser. Base64 encoding increases data size by approximately 33%.

Question 8

Why is my Base64 string 33% larger than the original?

Accepted Answer

Base64 represents every 3 bytes of input as 4 ASCII characters. This 4/3 ratio results in approximately 33% size increase. This is the trade-off for safe text-based transmission of binary data.

Question 9

Can I use Base64 images in CSS?

Accepted Answer

Yes. Use the Data URI as a background-image value: background-image: url('data:image/png;base64,...'). This is useful for small icons and sprites to reduce HTTP requests.

Question 10

Is Base64 encoding the same as encryption?

Accepted Answer

No. Base64 is an encoding scheme, not encryption. Anyone can decode Base64 data — it provides no security or confidentiality. Use proper encryption (like AES or RSA) for sensitive data.

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