Utilities
Image to Base64
Convert any image to a Base64 encoded data URI — ready to paste directly into HTML, CSS, or JSON without hosting the file separately.
Drop your image here
JPG, PNG, WebP, SVG, GIF — any image type supported
JPG PNG WebP SVG GIF
—
Original: —
Base64: —
—
Data URI
Base64 Only
HTML <img>
CSS background
JSON
0 characters
Live Preview — rendered from Base64
About This Tool
How to Convert an Image to Base64
- 1Drop or select your image — any format including JPG, PNG, WebP, GIF, and SVG is supported.
- 2The tool instantly encodes the image as a Base64 string and wraps it in the correct
data:URI format. - 3Choose your output format: raw Base64 string, a complete
<img>tag, a CSSbackground-imagedeclaration, or a JSON-ready string. - 4Click Copy to grab the output. No server involved — encoding happens entirely in your browser.
When to Use Base64 Image Encoding
HTML Email Templates
Email clients frequently block externally hosted images. Embedding small images as Base64 ensures they display without relying on an external server. Our guide on when developers actually use Base64 covers the tradeoffs in detail.
Eliminating HTTP Requests
Inlining small icons, logos, and UI elements as Base64 removes individual image HTTP requests. Useful for critical above-the-fold assets where load order matters.
API & JSON Payloads
APIs that accept image data often expect Base64-encoded strings rather than file uploads. Convert your image here before including it in a request body or configuration file.
Self-Contained HTML Files
Embedding images as Base64 creates a truly standalone HTML file with no external dependencies — useful for offline documentation, single-file demos, and portable reports.
A Note on When Not to Use Base64
Base64 encoding increases file size by approximately 33% — a 100KB image becomes a ~133KB string. For large images or anything cached by the browser, external image files with proper cache headers are almost always the better choice. Base64 is most appropriate for small icons (under 5KB), email templates, and API payloads. For web performance optimization, the right approach is to compress images with our Image Compressor and serve them in WebP format — not to embed them as Base64. See our complete image SEO guide for a full web performance workflow.
Frequently Asked Questions
Base64 is a way of encoding binary data (like images) as plain text using only 64 safe ASCII characters. Since images are binary files, they can’t be directly embedded in text-based formats like HTML, CSS or JSON. Base64 converts the binary data into a text string that can be included anywhere text is accepted. The tradeoff is that Base64 strings are about 33% larger than the original binary file.
A Data URI combines the image’s MIME type and its Base64-encoded content into a single string that browsers can use as an image source. It looks like:
data:image/png;base64,iVBORw0KGgo.... You can use this directly as the src attribute of an <img> tag or as a CSS url() value.
Base64 encoding increases file size by approximately 33% because it represents every 3 bytes of binary data as 4 ASCII characters. This is an inherent property of the encoding scheme. For web use, this means Base64 embedding is best suited for small images like icons, logos, and small decorative elements — not large photographs.
Base64 is best for: small images under ~5KB (icons, logos, small patterns) where eliminating an HTTP request saves more than the size increase costs; HTML emails where external image loading is often blocked; single-file HTML documents that need to be self-contained; and API payloads that need to transmit images as text. Avoid Base64 for large photos — the size overhead and loss of browser caching make it inefficient.
No — the conversion happens entirely in your browser using the FileReader API. Your image is read locally and converted to Base64 on your device. Nothing is sent to our servers. This makes the tool instant, private, and usable even without an internet connection once the page has loaded.
Need a full design workflow?
PaintShop Pro gives you full image editing and export control — ideal for preparing graphics before encoding for web, email, or API use.
Try PaintShop Pro
