A short companion for Base64 File: when it is useful, what it expects, and what to check before using the result.
What it does
Turn any file into a Base64 string, or a Base64 string back into a file. It is most useful for embedding a small image or font directly in a stylesheet as a data URI, or for working out what a data URI you were handed actually contains. The file is read locally through the File API.
Use the tool
Open Base64 File, add the input the tool asks for, run it, and check the output before using it elsewhere.
Input and output
- Input: text.
- Output: text.
- Category: Encoding.
Privacy and processing
Processing happens locally in your browser. This tool does not upload the input to ilham.dev.
Questions
Is there a size limit?
Whatever your browser can hold in memory. Base64 inflates a file by about a third, so a 3 MB image becomes roughly 4 MB of text.
Should I embed images as data URIs?
Only for small files. A data URI cannot be cached separately from the stylesheet it lives in and it has to be parsed along with it, so anything past a few kilobytes is usually better served as an ordinary file.
Related guide
For broader background, see Browser File Tools.