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Convert an image to Base64

Get a data URI, raw Base64, and ready-to-paste HTML and CSS snippets.

Processed in your browser. Files are never uploaded.

or drop a file here, or paste

How to convert an image to Base64

  1. Choose or paste an image.

  2. Wait a moment while it is encoded.

  3. Pick the snippet you need: data URI, raw Base64, HTML or CSS.

  4. Click Copy and paste it into your code.

  • No upload

    Your files are processed on your device and never sent anywhere.

  • Free, no signup

    No account, no watermark and no daily limit.

  • Fast

    No upload or download wait – results appear in seconds.

What is Image to Base64?

Image to Base64 turns an image file into text, so you can embed it directly in HTML, CSS, JSON or an email template without hosting a separate file. Base64 makes data about 33% larger, so it suits small icons and placeholders best.

When to use it

  • Inline a small icon in a CSS file to save a request.
  • Embed a logo in an HTML email template.
  • Put a test image into a JSON fixture or API request.
  • Store tiny placeholders in a design system.

Tips for the best result

  • Keep inlined images under a few KB.
  • Compress the image first to shorten the string.
  • SVG icons can often be inlined without Base64 at all.

Limits and privacy

We warn above 1 MB because huge strings slow editors and pages. Processing happens entirely in your browser, so your data never leaves your device and there is nothing to sign up for. Files are processed in your browser and never uploaded.

Many people who use Image to Base64 also need JSON formatter or Compress image, and Image converter is one click away. Every MondayKit tool works the same way – open the page, add your input, get the result – with no account, no watermark and no upload.

Frequently asked questions

What is a Base64 data URI?

A data URI embeds a file directly in text, like data:image/png;base64,iVBOR…, so it can be used in HTML or CSS without a separate file.

When should I inline images?

For small icons and placeholders of a few KB. Larger images are better served as normal files.

Why is the Base64 bigger than the file?

Base64 encodes every 3 bytes as 4 characters, so the text is about 33% larger than the file.

Is there a size limit?

No hard limit, but we warn above 1 MB because very long strings slow down editors and pages.

Related tools

JSON formatterFormat, validate, minify and explore JSON.Compress imageShrink JPG, PNG and WebP file size with a quality or target size.Image converterConvert between JPG, PNG and WebP (and read GIF/BMP).QR code generatorCreate QR codes for URLs, Wi-Fi, vCards and more – PNG or SVG.Resize imageChange image dimensions in pixels, percent or social presets.

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