Image to Base64 Converter

Embedding an image as Base64 puts the picture directly inside HTML, CSS, JSON or Markdown, so there is no separate file to host. Developers use it for small icons, email templates, test fixtures and API payloads. Drop in any number of images and get a ready-to-paste snippet for each, together with the size increase, so you can decide whether embedding makes sense.

Common uses

• Inline small icons and logos in CSS to save HTTP requests.
• Embed images in HTML email templates and single-file reports.
• Send images in JSON API requests or store them in configuration files.
• Create test fixtures and placeholders for unit tests.

Tips for best results

• Optimise or compress the image first – Base64 adds a third to its size.
• Prefer SVG for icons; it is often smaller even after encoding.
• Use the CSS output to embed backgrounds in stylesheets.
• Use raw Base64 when an API expects only the encoded data without the data: prefix.

Anatomy of a data URI

A data URI has three parts: the data: prefix, the MIME type such as image/png, and the Base64 text after ;base64,. Browsers treat it exactly like an image URL, so it can go anywhere a link to an image would – the src of an img tag, a CSS url() or a Markdown image. The MIME type comes from your file, so the browser knows how to decode it.

Batch conversion

Upload several images at once to convert a whole icon set. Each image gets its own copy button and preview, and the download contains all snippets separated by blank lines, ready for documentation or code reviews.

Safe for private assets

Encoding uses the browser's FileReader, so unreleased designs and internal screenshots never leave your machine.