Image to Base64

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Convert images to Base64 strings

Developer Tools

How to Use Image to Base64

  1. 1Upload your image
  2. 2Copy the generated Base64 string
  3. 3Paste it into your HTML img src, CSS background-image, or JSON payload
  4. 4Paste it directly into your HTML or CSS

About Image to Base64

Image to Base64 converts your image file into a Base64 text string that can be embedded directly into HTML img tags, CSS backgrounds, or JSON payloads — no separate image file needed. The tool shows the full data URL, the pure Base64 portion, and an example HTML snippet.

Base64 encoding is the standard technique for embedding binary image data inside text-based formats. It is used everywhere: HTML email templates that cannot reference external files, CSS files that inline background icons, JSON API responses that carry image thumbnails, and SVG files that embed raster images. This tool automates the conversion instantly in your browser.

Three output views are provided: the full data URL (ready to paste into an src attribute), the raw Base64 string (for APIs that expect just the encoded data), and a complete HTML img tag example. One-click copy buttons make it easy to grab each piece without manual selection.

Key Features of Image to Base64

  • Instant conversion with no server round-trip
  • Full data URL output ready to paste into HTML src attributes
  • Pure Base64 string output for JSON APIs and custom integrations
  • Ready-made HTML img tag snippet with one click
  • Copy to clipboard button for each output section
  • Supports all image formats the browser can display
  • No file size restrictions beyond browser memory
  • Completely client-side — your image data never leaves your device

Supported Formats

Input Formats

PNGJPGWEBPGIFSVGBMPICO

Output Formats

Base64 data URL stringRaw Base64 stringHTML img snippet

The output data URL includes the correct MIME type prefix (data:image/png;base64, etc.) automatically.

Examples

Inline icon in HTML email

Embed the icon directly in your email HTML so it displays even when external images are blocked.

Input

Small 32x32 PNG icon

Output

data:image/png;base64,iVBOR... (full data URL)

CSS background image

Use the data URL in a CSS background-image property to avoid an extra HTTP request for small decorative assets.

Input

Small decorative PNG texture

Output

background-image: url("data:image/png;base64,...")

Image in JSON API response

Copy the raw Base64 string to use as the value of an "avatar" field in a JSON payload without the data URL prefix.

Input

User avatar PNG

Output

Raw Base64 string for JSON field value

Common Use Cases

  • Embed small icons directly in HTML to avoid extra HTTP requests
  • Include images inline in CSS for background graphics
  • Store image data inside JSON API payloads or config files
  • Create self-contained HTML email templates with embedded images
  • Encode signature images for embedding in PDF generation scripts
  • Bundle small sprites directly in JavaScript source files

Troubleshooting

Output string is extremely long and slows down the editor

Solution

Base64 encoding increases size by ~33%. For images over 100 KB, consider serving them as regular files instead of inline data URIs.

Data URI does not display in the browser

Solution

Ensure the data URI includes the correct MIME type prefix, e.g. "data:image/png;base64," — the tool generates this automatically, so check for accidental truncation when copying.

SVG encoding produces broken output

Solution

For SVG files, URL-encoding is sometimes more reliable than Base64. Use the raw SVG source or URL-encode the SVG string instead.

Frequently Asked Questions

Why use Base64 for images?

Base64-encoded images can be embedded directly in HTML, CSS, or JSON without hosting the image as a separate file. This eliminates one HTTP request per image and is particularly valuable in HTML email where external image hosting may be blocked.

Does Base64 increase file size?

Yes, Base64 encoding increases the raw string size by approximately 33% compared to the binary image file. Base64 embedding is most appropriate for small images like icons and decorative elements under 10 KB.

What is the difference between the data URL and the raw Base64 string?

The data URL includes the MIME type prefix (e.g., data:image/png;base64,) followed by the Base64 data. The raw Base64 string is just the encoded data without that prefix. Use the full data URL in HTML src attributes and CSS url() values; use the raw string when an API expects Base64-only input.

Is there a file size limit?

There is no server-side limit since all encoding happens in your browser. Images up to 10 MB encode reliably on modern devices. Very large images may slow down or crash the browser tab.

Which image formats are supported?

Any format your browser can load: PNG, JPG, WEBP, GIF, SVG, BMP, and ICO are all supported. The MIME type is detected automatically from the file.

Can I use the Base64 output in CSS?

Yes. Use the full data URL as the value of a CSS background-image property: background-image: url("data:image/png;base64,..."). Useful for small decorative images and icons.

Can I use the Base64 output in a JSON API?

Yes. Copy the raw Base64 string (without the data URL prefix) to use as the value of an image field in a JSON payload. Check your API documentation to confirm which format is required.

What happens to transparency in the Base64 output?

Transparency is fully preserved when the source is a PNG or WEBP with an alpha channel. The MIME type in the data URL prefix tells the browser to render it with transparency intact.