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🔤 Image to Base64 Converter

Convert any image to a Base64 data URL. Useful for embedding images directly in HTML or CSS.

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Přetáhněte obrázek sem nebo klikněte pro procházení

Base64 Output

What is Image to Base64 Conversion?

Image to Base64 conversion encodes an image file into a Base64 text string — specifically a data URL like data:image/png;base64,iVBOR.... This allows you to embed the image directly into HTML, CSS, or JSON without needing a separate image file or HTTP request. The browser decodes the Base64 string on the fly and displays the image normally.

This technique is widely used to reduce HTTP requests on small icons and logos (improving page speed), to include images in JSON API payloads, to embed images in HTML email templates that do not rely on external hosting, and to store images in CSS for icon sprites or backgrounds. The trade-off is that Base64 strings are approximately 33% larger than the original binary file, so it is best used for small images.

How to Use Image to Base64

  1. Umístěte obrázek do zóny nahrávání nebo klikněte Vyberte Obrázek.
  2. The full Base64 data URL appears in the output box immediately.
  3. Klikněte Copy Full Data URL to copy data:image/png;base64,... for use in HTML or CSS.
  4. Klikněte Copy Base64 Only to copy just the encoded string (without the data URL prefix) for use in APIs or databases.

Why Use Our Image to Base64 Tool?

  • 100% zdarma — No limits on file size or conversions.
  • Žádná registrace — Instant conversion without an account.
  • Na základě prohlížeče — Your image is read locally using the FileReader API — never sent to a server.
  • Two Copy Options — Copy the full data URL or just the raw Base64 string separately.
  • Size Info — Shows original file size and Base64 string length to help you decide if embedding makes sense.

Často kladené otázky

Copy the full data URL and use it as the src attribute of an img tag: <img src="data:image/png;base64,iVBOR..." alt="My image">. You can also use it in CSS: background-image: url('data:image/png;base64,...');. The browser will render it exactly like an externally linked image.

Base64 encoding increases file size by approximately 33%. This is because it encodes 3 bytes of binary data as 4 ASCII characters. A 100 KB image becomes roughly 133 KB in Base64. This overhead is why Base64 embedding is recommended only for small images (typically under 5–10 KB).

Yes — Base64-encoded images in email HTML are useful because they do not rely on external hosting and display even when images are blocked by default. However, some email clients (notably Gmail) strip data URLs from HTML emails for security reasons. Test thoroughly before using Base64 images in email campaigns.

A data URL is the complete string including the MIME type prefix: data:image/png;base64,XXXX. The Base64 string is only the XXXX portion after the comma. Use the full data URL in HTML/CSS; use just the Base64 string when sending images via API, storing in a database, or when the receiving system adds its own prefix.

Rychlá fakta

  • ✓ 100% zdarma, žádné skryté poplatky
  • ✓ Není potřeba žádný účet ani přihlášení
  • ✓ Funguje v jakémkoli prohlížeči
  • ✓ Vaše data nikdy neopustí vaše zařízení
  • ✓ Copy full data URL or raw Base64 separately

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