File to Base64 Encoder Online
Free online encoder that reads small files and outputs Base64 for data URLs, tests, and API mocks.
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Free online encoder that reads small files and outputs Base64 for data URLs, tests, and API mocks.
How it works
This tool reads a file and encodes its bytes into Base64. It’s useful for embedding small assets in JSON, HTML, or API payloads.
Example
Input: image.png Output: iVBORw0KGgoAAAANSUhEUg...
FAQ
Why does Base64 output get so large?
Base64 increases size by about 33% compared to the original binary data.
Is Base64 good for large files?
Usually no. For large files, prefer uploading binary or using object storage instead of embedding Base64.
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