Convert Image To Base64

Image to Base64 Converter

Upload an image and get its Base64 encoded string instantly — no server, 100% client-side

Step 1 — Choose Image Source

Choose a file or drag & drop it here

Supports JPG, PNG, GIF, BMP, SVG, WebP, ICO — up to 50 MB

Browse Files

Note: the URL must allow cross-origin requests (CORS). Most CDN-hosted images work fine.

Preview & File Info

Name	—
Type	—
Size	—
Dimensions	—
Base64 size	—

Step 2 — Choose Output Format & Encode

Format: Plain Base64 (raw string only) Data URI (data:image/…;base64,…) CSS background-image: url(…) HTML Favicon <link rel="icon"> HTML Hyperlink <a href="…"> HTML Image <img src="…"> HTML IFrame <iframe src="…"> JavaScript new Image() JavaScript window.open() JSON {"mimeType":…,"data":…} XML <image><data>…</data></image>

🔒 100% Private — runs entirely in your browser Your image is never uploaded to any server. All conversion happens locally using the FileReader API. The resulting Base64 string can be embedded directly in HTML, CSS, JS, or used in API payloads.

Image to Base64 Converter — client-side, no upload, no tracking

What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data — such as images, fonts, or files — as a string of ASCII characters. It was originally designed to allow binary content to be safely transmitted over systems that only handle text, such as email (MIME) or XML.

The name comes from the fact that it uses a set of 64 characters: A–Z, a–z, 0–9, + and /, plus = as a padding character. Every 3 bytes of binary data become 4 Base64 characters, which means the encoded result is roughly 33% larger than the original.

In web development, Base64 is most commonly seen as a Data URI — a URL that embeds the file content directly, for example: data:image/png;base64,iVBORw0KGgo…

Why Should You Use Base64?

Base64 encoding is useful in several practical scenarios:

• Embed images in HTML or CSS — inline a small icon or background without an extra HTTP request.
• Email attachments — MIME email encodes all binary attachments in Base64 so they survive text-only transport protocols.
• API payloads — JSON and XML cannot carry raw binary; Base64 lets you pass image data inside a JSON field.
• Single-file bundles — self-contained HTML files can include images, fonts, and audio with no external dependencies.
• Data URLs in CSS — background images can be inlined directly in a stylesheet, reducing the number of network requests.
• Security contexts — some environments (Content Security Policy, sandboxed iframes) block external URLs but allow data URIs.

Best Practices for Using Base64

• Keep it small. Base64 is best suited for small assets (icons, logos, tiny images). Large images encoded in Base64 bloat your HTML/CSS and are not cached separately by the browser.
• Don't use it for large files. Anything above ~10–20 KB is usually better served as a regular external file, which benefits from browser caching and compression.
• Use it for truly static assets. If the image never changes, embedding it once is fine. If it changes frequently, a regular URL is easier to update.
• Prefer modern formats. Before encoding, convert images to WebP or AVIF — they're much smaller than PNG or JPG, which reduces the Base64 string size too.
• Avoid storing Base64 in databases. Store the original binary blob instead and encode on-the-fly when needed — raw binary is ~33% smaller.
• Use HTTPS when loading remote images. Mixed-content rules may block Base64-converted images fetched over HTTP on secure pages.