How to use File to Base64
- Choose a file.
- Select Convert to Base64.
- Copy the data URL or download the text output.
- Use the value only in systems that expect a Base64 data URL.
🔒 Local browser processing
File to Base64
Encode file bytes as a Base64 data URL for testing, embedding or data-transfer workflows. No registration is required.
Reviewed
Loading the File to Base64 tool…
What the tool creates
The tool uses FileReader to produce a data URL containing the MIME type and Base64 payload. The result can be copied or downloaded as a .base64.txt file.
The output is displayed in a text area and can also be saved as the original file name plus .base64.txt.
Common uses
- Embedding small assets in development
- Testing APIs that accept Base64
- Storing a portable text representation of binary data
Important limits
- Base64 increases data size by roughly one third before the data-URL prefix.
- Very large output can be difficult to copy, store or paste.
- Encoding is not encryption and does not protect confidential content.
Privacy note: Supported processing runs in this browser tab. Do not process files you are not authorized to handle, and keep an original backup.
File to Base64 questions
Is Base64 encryption?
No. Anyone can decode Base64; it is an encoding format.
Why is the output larger than the file?
Base64 represents binary data with text characters and typically adds about 33% overhead.
What is a data URL?
It includes a media type followed by the Base64-encoded content, beginning with data:.
Can I convert any file type?
The file picker accepts any file the browser can read.
Can I download the encoded text?
Yes. The tool creates a .base64.txt download.
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