Sanitize Untrusted SVG Before Putting It in Your App

SVG is XML that browsers render as graphics—and sometimes as active content. A file from a contractor, a random “free icon” pack, or a user upload can include <script>, onload= handlers, or external references you never intended to ship.

Inlining that markup into React, Vue, or a CMS theme is a classic XSS footgun. Before the icon hits production, sanitize it.

SVGForge’s SVG Sanitizer cleans untrusted SVG locally in your browser—so you can scrub risky constructs without uploading brand or customer assets to a third-party scanner.

What risks show up in SVG?

Common issues in the wild:

• <script> blocks
• Inline event handlers (onclick, onload, …)
• Suspicious javascript: URLs
• Unexpected foreign objects or embeds

Not every odd attribute is an exploit—but treating unknown SVG as untrusted input is the right default for apps that accept uploads or paste from the web.

What the SVG Sanitizer does

Open svgforge.dev/svg-tools/sanitizer to:

• Strip script tags and many dangerous handlers
• Surface what was removed so you can audit the pass
• Preview the cleaned graphic before download
• Keep processing client-side (no upload for the sanitize step)

Pair with the SVG Validator when you also want markup / viewBox / a11y hints—not a replacement for a full security review, but a fast practical gate.

Step 1: Treat the file as untrusted

1. Save the source SVG separately (don’t overwrite the original yet).
2. Note where it came from (upload, vendor zip, email).
3. Open the SVG Sanitizer.

Step 2: Sanitize and review the report

1. Upload or Paste the SVG.
2. Run sanitize (settings depend on the tool UI—use the recommended / strict options for untrusted files).
3. Read the removal summary: tags and attributes stripped.
4. Check the preview—the icon should still look right.

If the graphic collapses or vanishes, the “art” may have depended on something unsafe (rare for simple icons) or on markup you still need—inspect carefully before forcing a looser pass.

Step 3: Optimize, then embed

Recommended pipeline for third-party icons:

1. Sanitize (this article’s CTA)
2. Optimize for size
3. Optionally convert to a component
4. Commit the cleaned asset—not the original dump

For user-generated uploads in production apps, also enforce server-side or build-time sanitization; SVGForge is ideal for interactive review and local cleanup.

Practical recipes

Vendor sent a “logo.svg” with Illustrator soup
Sanitize → Metadata Remover → Optimize → ship.

User avatar as SVG (if you allow it)
Never inline raw uploads. Sanitize offline in the tool while prototyping policy; in production use a dedicated sanitizer library in your backend or edge.

Icon pack from an unknown site
Sanitize each file you actually use—don’t trust the ZIP wholesale.

After editing in the SVG Editor
Your own edits are usually fine; still sanitize if the starting file was untrusted.

FAQ

Is sanitizing the same as optimizing?

No. Sanitize targets security-sensitive constructs. Optimize shrinks and rewrites for performance. Do both when shipping third-party SVG.

Does SVGForge replace a security audit?

No. It’s a practical browser-side cleaner for common XSS patterns in SVG. High-risk products should still use vetted libraries and CSP.

Are my files uploaded to sanitize?

No. The sanitizer runs in your browser.

Will sanitizing break animations?

It can, if animations relied on script. Prefer SMIL/CSS animations and re-test after cleaning.

Quick checklist

1. Keep the original untrusted file aside
2. Open the SVG Sanitizer
3. Paste / upload → review removals + preview
4. Optimize → embed or convert to components
5. Prefer cleaned copies in git

Try it now

Open the free SVG Sanitizer, paste a third-party icon, and strip risky markup without uploading. When you need trusted open icons instead, browse SVGForge’s library and still optimize before production.