Question 1

What is Base64 encoding used for?

Accepted Answer

Turning binary data into text. You need it for embedding images in HTML (data URIs), sending files through JSON APIs, or storing binary stuff in text databases. Makes the data 33% bigger, but it works anywhere that only accepts text.

Question 2

How do I encode an image to Base64?

Accepted Answer

Drag your image into the Image or File mode. It encodes automatically and shows a preview. Copy the raw Base64 or get a full data URI ready for your HTML img tag.

Question 3

What is a Data URI and when should I use it?

Accepted Answer

Data URIs let you embed files directly in HTML/CSS like data:image/png;base64,iVBORw0K... Saves an HTTP request. Good for small icons under 10KB. Don't use it for big images — it bloats your HTML.

Question 4

Is Base64 encoding secure?

Accepted Answer

Nope. Base64 is encoding, not encryption. Anyone can decode it in 2 seconds. Never use it to hide passwords or secrets. If you need security, use real encryption like AES.

Question 5

How do I decode Base64 back to a file?

Accepted Answer

Switch to Decode mode. Paste the Base64 string. Download the file. For images, you get a preview first. The tool figures out the file type from the data URI or you can set it manually.

Question 6

What's the difference between standard and URL-safe Base64?

Accepted Answer

Standard Base64 uses + and / which break URLs. URL-safe Base64 swaps them for - and _. Use URL-safe when putting Base64 in URLs or query params.

Question 7

Can I encode large files?

Accepted Answer

Up to 10MB works fine. Larger files might slow down your browser. Remember Base64 adds 33% to the size, so a 10MB file becomes 13MB encoded.

Base64 Encoder/Decoder

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