Image to Base64 Converter — no server, no signup

    Convert Image to Base64— free, instant.

    Encode any image to a Base64 data URI you can embed directly in HTML, CSS, or JSON. No uploads, no server — everything runs in your browser.

    No signup required
    100% private
    Runs in your browser
    Supports all formats
    1Upload image
    2Base64 output
    1Upload image

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    * · Max 50 MB

    2Base64 output

    Base64 output will appear here

    Upload an image to encode

    Instant encoding

    Convert any image to Base64 in milliseconds.

    100% private

    Images never leave your device.

    Ready to embed

    Copy the data URI straight into HTML/CSS.

    No installation

    Works in any modern browser.

    What is Base64 image encoding?

    Base64 encoding converts binary image data into an ASCII text string that can be embedded directly in HTML, CSS, or JSON. The encoded string is prefixed with a data URI scheme (data:image/png;base64,) so browsers render it without an additional HTTP request.

    Inline Base64 images eliminate one round-trip per asset, reducing page load for small icons and sprites by up to 30% [Google Web Fundamentals, 2024]. The trade-off: Base64 inflates file size by ~33%, so it's best for images under 10 KB.

    Trndinn's encoder uses the browser's native FileReader API. Your images never leave your device — encoding happens entirely in-memory.

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    Frequently asked questions

    What is a Base64 image?
    A Base64 image is an image file encoded as a text string using the Base64 alphabet. It can be embedded directly in HTML (<img src="data:image/png;base64,...">), CSS (background-image: url(...)), or JSON without hosting the file separately.
    Does the image get uploaded anywhere?
    No. The conversion happens entirely in your browser using the FileReader API. Your image never leaves your device.
    What image formats are supported?
    PNG, JPG/JPEG, WebP, GIF, SVG, BMP, ICO — any format your browser can read via FileReader.
    How do I use the Base64 string in HTML?
    Copy the full data URI (it starts with data:image/...) and use it as the src attribute of an <img> tag, or as a CSS background-image url() value.
    Is there a file size limit?
    No server-imposed limit. The practical limit is your device's available RAM. For very large images (>10 MB), the resulting Base64 string will be large; consider whether inline embedding is the right choice.
    When should I use Base64 images instead of regular image files?
    Base64 is ideal for small images (under 10 KB) like icons, logos, and UI sprites where eliminating an HTTP request outweighs the 33% size increase. For larger images, a regular file served from a CDN is more efficient.
    Does Base64 encoding reduce image quality?
    No — Base64 is a lossless encoding. It represents the exact same binary data in a text format. The image quality is identical to the original file.

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