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無料 Image to Base64
Convert an image to a Base64 data URI for inline use in CSS, HTML, or Markdown. Copy ready-made snippets. Encoded in your browser; never uploaded.
ファイルサイズ制限なしファイルはプライベートのままログイン不要永遠に無料
ファイルをここにドロップするか、クリックして選択
PNG, JPG, WebP, GIF, SVG, AVIF, X, Image ファイルサイズ制限なし
ファイルがデバイスを離れることはありません。すべての処理はブラウザ内でローカルに行われます。
Convert an image to a Base64 data URI you can paste directly into CSS, HTML, or Markdown — no separate file needed. Encoded in your browser; never uploaded.
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使い方
A data URI embeds an image directly into your code as text, so it loads without a separate file request — handy for small icons and self-contained HTML. This encodes it in your browser.
- 1You drop in an imageIt's read locally with the FileReader API — never uploaded.
- 2It's Base64-encodedThe image bytes become a data: URI (data:image/...;base64,…) right in your browser.
- 3You pick a snippetCopy the raw data URI, or ready-made CSS (background-image), HTML (<img>), or Markdown.
- 4Paste it into your codeThe image now travels inline with your CSS/HTML — no extra file to host.
The image is encoded entirely on your device. Note that Base64 is ~33% larger than the original, so data URIs are best for small images.
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✓Completely free — no hidden costs, ever
✓No account, email, or login required
✓Files stay on your device — processing happens in your browser
✓Works on any device — phone, tablet, desktop
✓No watermarks on any output
✓Browser memory limits may apply for very large files
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