Base64 Encoder
Convert any image to a Base64 data URL or raw string online for free. Embed images directly in HTML, CSS, or JSON. Copy with one click, no signup.
Use Base64 Encoder FreeHow to encode an image to Base64
- 1
Upload your image — JPG, PNG, WebP, GIF, or SVG — by clicking the drop zone or dragging it onto the page
- 2
Select the output format: Data URL (includes the data:image/...;base64, prefix for use in HTML/CSS) or raw Base64 string
- 3
Click Copy to copy the encoded string to your clipboard, or use it directly in your HTML src, CSS url(), or JSON payload
Frequently Asked Questions
How do I convert an image to Base64 online?
Upload your image — JPG, PNG, WebP, GIF, or SVG are supported. Choose whether you want a Data URL (with the data:image prefix) or a raw Base64 string. The encoded output appears immediately — click Copy to copy it to your clipboard. No signup required and your image never leaves your browser.
What is the difference between a Data URL and a raw Base64 string?
A Data URL includes the full prefix — for example data:image/png;base64,iVBORw0K... — which you can paste directly into an HTML src attribute or a CSS url() function. A raw Base64 string is just the encoded data without the prefix, used when an API or JSON payload expects the encoded bytes alone without the MIME type declaration.
When should I use Base64 images instead of regular image files?
Use Base64 for small images — icons, logos under 5KB, inline SVG fallbacks — to eliminate an HTTP request and embed the image directly in HTML or CSS. For large images, Base64 increases file size by approximately 33% and slows page rendering, so external image files are more efficient above roughly 5KB.
Can I decode a Base64 string back to an image?
Yes. Paste a Base64 string or a full Data URL into the input area and the tool decodes it back to the original image for preview and download. This is useful for verifying that a Base64 string is valid and contains the expected image content.
Are my images uploaded to a server when encoding to Base64?
No. All encoding and decoding runs entirely in your browser. Your image is never sent to any server — the Base64 conversion happens locally using the FileReader API. This makes it safe to encode private logos, confidential screenshots, or any sensitive image without any data leaving your device.