The image file is rejected
confirm the actual file signature and completeness; changing an extension does not convert the image.
Convert image to Base64
Convert image to a raw Base64 string or data URL. Encode the original file bytes, review the output, then copy or download it.
Base64 utility · Fast, exact Base64 conversion
What this tool does
This converter reads the selected image file and represents its original bytes as Base64. Choose a raw string for APIs and configuration, or include a data-URL prefix only when the destination expects one.
Convert now
Base64 represents bytes as text; it is not encryption.
How to convert image to Base64
Choose the image file you want to encode.
Keep Encode selected and choose the output option shown by the tool.
Review the output and byte information, then copy or download the result.
Output and format behavior
Choose JPEG, PNG, WebP, AVIF, GIF, SVG, BMP, ICO or APNG. The converter encodes the selected file’s original bytes; it does not change the image format, dimensions or compression.
Use raw Base64 for most API fields. Use a complete data URL only when the destination explicitly expects the MIME-prefixed form.
Expert tip
Use Base64 for small, self-contained payloads or tests. A separately cached image file is often better for a reusable production asset.
When this is useful
Typical workflows include:
- Build a data URL only for a destination that explicitly supports the relevant MIME type.
- Prepare an exact payload for an API request, webhook fixture or integration test that expects Base64 text.
- Create a reproducible test fixture without manually rewriting the source bytes.
Limitations and safety
Important constraints:
- Base64 normally adds about one third to the byte payload, before any data-URL prefix or surrounding markup.
- Base64 is reversible encoding, not encryption. Anyone who receives the string can decode the original bytes.
- The converter preserves the existing image bytes; it does not resize, recompress or change image quality.
Troubleshooting
The result fails downstream
check whether the receiver expects raw Base64 or a full data URL and, when applicable, use the correct MIME.
The tab becomes slow
large inputs can consume substantial browser memory, and data URLs can exceed limits in receiving systems. Try a smaller input or use a file-based transfer workflow.
Frequently asked questions
What exactly is preserved?
Choose JPEG, PNG, WebP, AVIF, GIF, SVG, BMP, ICO or APNG. The converter encodes the selected file’s original bytes; it does not change the image format, dimensions or compression.
Does Base64 change image quality?
Base64 does not change image quality. The converter encodes the existing file bytes without resizing or recompressing the image.
Should I include a data-URL prefix?
Use a prefix only when the destination expects a complete data URL. Most API fields that say “Base64” expect the raw payload instead.
Why is the image file rejected?
Confirm that the file contents match the claimed image format; changing only the filename extension does not convert a file. Also check that the input is complete.
Related Base64 tools
Continue with the localized page that matches the next operation:
Choose your file above, run the conversion, then copy or download the Base64 result.