Developer
Image to Base64 Converter
- Browser-based
- No signup
This image to Base64 converter encodes PNG, JPG, and other image files into Base64 strings for data URIs, inline email assets, and JSON API fields. Upload an image, copy the encoded output, and embed without hosting a separate file.
Base64 expands file size by roughly 33%—prefer external URLs for large images in production pages.
Data URIs work well for tiny icons, test fixtures, and single-file prototypes.
100% Client-Side
Your data never leaves your computer.
How to use this tool
Upload or select an image file, encode to Base64, and copy the full data URI or raw Base64 string as needed.
Worked example
Example: encode a 4 KB favicon PNG to a `data:image/png;base64,...` URI for an inline HTML email template.
When to use this
- Embedding small icons in HTML email.
- Creating test payloads with inline image data.
- Prototyping without a CDN or asset server.
Common examples
- UTF-8 email header value → Base64 for debugging MIME parts.
- Small JSON claim → Base64 segment inspection before JWT assembly.
- Data URL prefix stripped → decode image bytes from `data:image/png;base64,...` payloads.
- Small SVG icon → data URL for inline HTML email test.
- UTF-8 string with emoji → Base64 for API fixture matching production encoding.
What people search for
- base64 encode decode
- base64 encoder online
- base64 decoder
- encode string base64
- base64 converter
Common mistakes
- Inlining multi-megabyte photos and bloating page weight.
- Forgetting the `data:image/png;base64,` prefix when browsers expect a data URI.
- Using standard Base64 where APIs require URL-safe encoding.
Related long-tail tasks
- jpg to base64 data uri
- base64 image decode back to file
- svg to base64 inline css
How it works
Choose Encode or Decode, then paste or type text. Encoding converts UTF-8 text to standard Base64. Decoding accepts standard or URL-safe Base64 (with optional whitespace) and returns the original text. All processing runs in your browser.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Related Base64 Encoder & Decoder guides
These pages use the same base64 encoder & decoder with guides tailored to specific search intents.
Frequently asked questions
Which image formats are supported?
Common formats like PNG, JPEG, GIF, and WebP typically encode through the base tool file input.
Is there a size limit?
Very large files may slow the browser—keep inline assets small for practical use.
Are images uploaded to a server?
Encoding runs locally in your browser on Utilnivo.
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