File to Base64
This tool reads the selected bytes and creates a text-safe Base64 representation with optional MIME prefix. The complete operation runs in temporary browser memory, so the input is never uploaded or stored by LocalKit.
The input stays available if you need to adjust a setting.
How to use file to base64
- 1
Add the source values or files shown in the workbench.
- 2
Choose the settings for file to base64.
- 3
Run the tool, inspect the local result, then copy or download it.
A realistic example
Encode a tiny fixture as a data URL for a self-contained test page. The source and generated result remain in this browser tab throughout the operation.
Supported formats and limits
Input: any local file. Output: UTF-8 Base64 text.
- Base64 increases size by roughly one-third and is inefficient for large files.
- Available memory and browser limits still apply to very large inputs.
Questions people ask
What does file to base64 change?
This tool reads the selected bytes and creates a text-safe Base64 representation with optional MIME prefix.
Is any input sent to a server?
No. LocalKit performs this operation in your current browser tab.