How to convert svg files to base64 encoded strings instantly
- Step 1Drop or paste your SVG — Upload a .svg file or paste SVG source into the text editor. The tool encodes it immediately on file drop or text change.
- Step 2Toggle the data URI prefix — Switch on Include data URI prefix to get data:image/svg+xml;base64,[encoded] — ready for img src or CSS background-image. Switch off for raw Base64 only (JSON payloads).
- Step 3Copy the encoded string — Click Copy to clipboard. The encoded string is ready to paste into your JSON, HTML attribute, or wherever the SVG needs to be embedded.
Frequently asked questions
When should I use Base64 instead of a URL reference?+
Use Base64 when embedding SVGs in JSON API responses, email HTML, React Native Image source objects, PDF generation libraries, or any environment where referencing an external file URL isn't possible.
Does Base64 encoding increase file size?+
Yes — Base64 encoding adds approximately 33% overhead. A 3 KB SVG becomes ~4 KB Base64. For CSS backgrounds, URL-encoded data URIs are typically smaller and preferable.
Can I decode the Base64 back to SVG?+
Yes. The tool includes a Decode tab. Paste a Base64 string and it decodes to the original SVG. You can also use atob(base64String) in any browser console.
Is there a size limit?+
Free tier: 5 MB SVG input. The output string will be approximately 33% larger. Very long Base64 strings can be slow to copy on some browsers due to clipboard API limitations.
Privacy first
Every JAD SVG tool runs entirely in your browser using the DOM API and Canvas. Your SVG files never leave your device — verified by zero outbound network requests during processing.