Converter · SOTA RFC 2397 + SVG inline + CSS escape
Data URI Builder (Inline Assets)
Build data: URIs (RFC 2397) for inline images, SVGs, fonts, and CSS assets. Base64 or percent-encoded, size budget indicator, and ready-to-paste CSS, HTML, and JS snippets.
How to Use Data URI Builder in 3 Steps
- Configure. Drop a file or paste text/SVG markup. Auto-detects MIME type; for files without extension, pick from the dropdown.
- Process. Choose encoding: base64 (universal, works for any binary) or percent-encoded (smaller for SVG and plain text).
- Export. Copy the data: URI or paste-ready snippet: CSS background-image, HTML src, JS import. Size-budget indicator warns if the payload exceeds ~8 KB (HTTP/2 push often better above that).
Why Data URI Builder on Pixlane
Data URIs embed small binary assets directly in HTML, CSS, or JavaScript. Eliminating extra HTTP requests for tiny icons, SVG sprites, or inline fonts. Pixlane converts files or text to RFC 2397 data: URIs with both base64 and URL-encoded variants, shows size comparison (base64 is ~33% larger than the source; percent-encoding varies for text), and generates ready-to-paste CSS/HTML/JS snippets.
- RFC 2397 Compliant: Official data: URI scheme with proper MIME type, charset, and encoding indicators. Correctly escapes commas and special chars.
- Base64 + Percent: Base64 supports binary data; for SVG and small text, compare encoded output sizes and choose the form that fits the use case.
- Size Budget Indicator: Warns when URI exceeds 4 KB (large for inline CSS) or 8 KB (browser cache efficiency drops). Helps decide between inline and external loading.
- Ready Snippets: Copy-paste CSS `background: url(data:...)`, HTML `<img src>`, JS `new URL(data:...)`, or SVG inline. No escaping errors.
Frequently Asked Questions
When should I use data URIs?
For tiny assets (<4 KB) where saving an HTTP request matters: SVG icons, small PNG sprites, fallback fonts. For larger assets, HTTP/2 push or normal caching is faster (browsers can't cache data URIs).
Base64 vs percent-encoding?
Base64 is universal and works for any binary. For SVG or plain text, compare Base64 and percent-encoded output because size varies with the content. For binary (PNG, JPEG, fonts) always use base64.
Is there a max size?
Browsers support very long URLs, but practical limits vary: Chrome/Firefox handle multi-MB URIs; Edge/Safari are stricter. Above 64 KB, switch to external files or HTTP/2 push for reliability.
Is this tool free?
Yes. Data URI Builder on Pixlane currently requires no signup for core use; tool-specific limits may apply.