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.

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

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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.

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 on your device.

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 stays on your device and is not uploaded.

Related Base64 Encoder & Decoder guides

These pages use the same base64 encoder & decoder with guides tailored to specific search intents.

Base64 Encoder & Decoder — general payment estimate
Base64 Decoder Online
Base64 to Text Decoder
File Base64 Encoder
Base64 Encode and Decode Online
Text to Base64 Converter
Base64 Encode Decode Tool
Base64 String Encoder

FAQ

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 works on your device on Utilnivo.

Page last reviewed: July 6, 2026

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