Question 1

What is a Base64 image string used for?

Accepted Answer

Base64 encodes binary image data as text, which lets you embed images directly inside HTML, CSS, or JSON without a separate file request — commonly used for small icons or inline email images.

Question 2

Does Base64 encoding increase file size?

Accepted Answer

Yes, by about 33%, since Base64 represents binary data using only text-safe characters. It's best for small images (icons, logos) rather than large photos.

Question 3

What format should I paste for decoding?

Accepted Answer

You can paste either a full data URL (starting with "data:image/png;base64,...") or just the raw Base64 payload — this tool detects the mime type automatically from a data URL, or lets you choose one manually for a raw string.

Question 4

Is my image or Base64 data uploaded anywhere?

Accepted Answer

No. Encoding and decoding both happen entirely in your browser using the FileReader and Blob APIs — nothing is sent to a server.

Question 5

Why did decoding fail with an "Invalid Base64 data" error?

Accepted Answer

This means the pasted text isn't valid Base64 — check for missing characters, extra whitespace, or that you copied the entire string including the trailing "=" padding if present.

Image to Base64 Converter

Result

Frequently Asked Questions

What is a Base64 image string used for?

Does Base64 encoding increase file size?

What format should I paste for decoding?

Is my image or Base64 data uploaded anywhere?

Why did decoding fail with an "Invalid Base64 data" error?

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