SVG Base64 Data URI vs External File
Base64-encoded SVG avoids an extra HTTP request but forfeits caching, while an external file enables caching at the cost of a request.
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Request Overhead vs Caching Benefits
A base64-encoded SVG embedded directly in HTML or CSS avoids the overhead of an additional HTTP request, which can help for a small icon used only once, but this approach also means the browser can't cache that asset separately, forfeiting reuse benefits when the same graphic appears on multiple pages.
- Base64 embedding avoids an extra HTTP request for a small, single-use icon
- The browser can't cache a base64-embedded asset separately from its parent file
- This forfeits reuse benefits when the same graphic appears on multiple pages
When External Files Make More Sense
An external SVG file referenced via an img src or CSS background-image gets cached independently by the browser, meaning a graphic reused across many pages loads from cache after the first request, making external files the better choice for shared icons, logos, and illustrations across a site.
- External files get cached independently by the browser after first load
- Reused graphics load from cache on subsequent pages, avoiding repeat downloads
- External files are the better choice for shared icons and logos site-wide
Frequently Asked Questions
When does base64 embedding make sense for an SVG?
Base64 embedding suits small, single-use icons that appear on only one page, where avoiding an extra HTTP request outweighs the lack of independent browser caching.
Does base64 encoding increase an SVG's file size?
Yes, base64 encoding typically increases the encoded data size by roughly a third compared to the original file, which is a tradeoff against avoiding the extra request.
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