OpusDesk Hub What this tool does
Encode an image file’s original bytes as Base64 text. FileReader reads the original file as a data URL. The prefix option switches between the full data:image/...;base64, string and just its encoded payload. CSS and HTML copy buttons wrap the full data URL.
How to use Image to Base64
- Prepare the input. Choose an image file.
- Run or configure the tool. Choose whether to include the data URL prefix.
- Check and use the output. Copy the plain payload, CSS wrapper or HTML attribute for the intended destination.
How this tool works
FileReader reads the original file as a data URL. The prefix option switches between the full data:image/...;base64, string and just its encoded payload. CSS and HTML copy buttons wrap the full data URL.
Worked example
Input: A PNG fixture; include the data URL prefix
Output: A string beginning data:image/png;base64,; decoding its Base64 payload reproduces the exact original file bytes.
Limits, assumptions and interpretation
Image input is limited to 15 MiB.
- Base64 is encoding, not encryption or image compression; its payload is usually larger than the original bytes.
- Embedding large data URLs increases document size and may conflict with the destination’s content-security policy.
- Only files identified as images are accepted; verify the MIME type and avoid embedding untrusted active formats.
Supported inputs and limits
- A PNG fixture; include the data URL prefix
- Image input is limited to 15 MiB.
- Base64 is encoding, not encryption or image compression; its payload is usually larger than the original bytes.
- Embedding large data URLs increases document size and may conflict with the destination’s content-security policy.
- Only files identified as images are accepted; verify the MIME type and avoid embedding untrusted active formats.
Frequently asked questions
What does this tool actually do?
FileReader reads the original file as a data URL. The prefix option switches between the full data:image/...;base64, string and just its encoded payload. CSS and HTML copy buttons wrap the full data URL.
What should I check before using the result?
Image input is limited to 15 MiB. Base64 is encoding, not encryption or image compression; its payload is usually larger than the original bytes. Embedding large data URLs increases document size and may conflict with the destination’s content-security policy. Only files identified as images are accepted; verify the MIME type and avoid embedding untrusted active formats.
Is information sent to a server?
Tool inputs are processed in this browser. This product does not use analytics or send your input to an external API. Clicking an external website link still visits that website.
Related tools
For a deeper workspace, explore the related OpusDesk Hub Studio.