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What is Image to Base64 Converter?

Free image to Base64 / data URI converter. Drop in a PNG, JPG, WebP, GIF, or SVG and get the Base64 data URI plus ready-to-paste CSS background and HTML img snippets. Your image never leaves your browser. No signup.

No file uploadsNo tracking of inputsNo account requiredWorks offline after first load

Image to Base64 runs entirely in your browser using JavaScript (browser). Your data never leaves your device.

Free Image to Base64 Converter

Turn any image into a Base64 data URI you can paste straight into HTML, CSS, or an email template — no extra HTTP request needed. Drop in a PNG, JPG, WebP, GIF, or SVG and get the raw Base64, a complete data URI, a CSS background-image snippet, and an HTML img tag, with a live preview and size breakdown. Everything is encoded locally using the browser FileReader API.

Free to embed on your website · No signup required

Drop an image here or click to upload

PNG, JPG, WebP, GIF, SVG — your file never leaves your device

Frequently Asked Questions

A data URI embeds a file directly inside HTML or CSS as a Base64 string, in the form data:[mime-type];base64,[data]. The browser renders it without making a separate network request, which is useful for tiny, frequently-used assets.
Inlining is best for small assets: SVG icons, tiny logos, tracking pixels, and images in HTML email (where many clients block external images). It eliminates an HTTP request for critical above-the-fold images. Avoid it for large or widely-reused images.
Yes — Base64 encoding adds about 33% to the file size, and inlined images cannot be cached separately. As a rule of thumb, only inline files under about 5 KB; for anything larger, a normal image URL with HTTP caching is more efficient.
No. The image is read and encoded entirely in your browser with the FileReader API. Nothing is uploaded, which makes this safe for logos, screenshots, and private images.
Yes. SVG files work like any other image here. For SVGs you can also URL-encode rather than Base64-encode for a slightly smaller result, but Base64 is the most broadly compatible option.

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What Is a Base64 Data URI?

A data URI embeds a file's bytes directly inside your HTML or CSS as a Base64 string, so the browser never makes a separate network request for it. The format is data:[mime-type];base64,[encoded-data] — for example data:image/png;base64,iVBORw0KGgo…. This tool reads your image with the browser's FileReader API and gives you the data URI plus ready-to-paste CSS and HTML snippets.

When to Inline an Image as Base64

Inlining shines for tiny, frequently-used assets: SVG icons, 1×1 tracking pixels, small logos in HTML email (many clients block external images but allow inline ones), and critical above-the-fold images where eliminating a round-trip improves first paint. It is also handy in single-file demos and when a CDN is not available.

When NOT to Inline

Base64 encoding adds about 33% to a file's size, and inlined assets cannot be cached separately or reused across pages. For large images or anything used on many pages, a normal <img src> with HTTP caching wins. As a rule of thumb, inline only files under ~5 KB.

Private by Design

Your image is encoded locally in your browser using the FileReader API — it is never uploaded to a server. That makes this safe for logos, screenshots, and any image you would rather not hand to a third-party converter or paste into a chatbot.