Does this rename duplicate IDs?

No. This tool reports duplicates. A rename ID tool is planned separately.

Does it check IDs across multiple files?

The first version checks the pasted SVG only.

Can duplicate IDs break gradients?

Yes. Gradients, masks, clips, and symbols can resolve to the wrong element when IDs collide.

SVGKit

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Duplicate ID Checker

Find duplicate SVG id values that can break gradients, masks, clips, sprites, and inline embeds.

Duplicate ID Checker

Find duplicate SVG id values that can break gradients, masks, clips, sprites, and inline embeds.

Result

Choose an SVG file, paste SVG markup, or load the sample to begin.

Page context

Where Duplicate ID Checker fits

Duplicate ID Checker finds repeated SVG id values that can break gradients, masks, clips, symbols, and inline embeds.

Why duplicate IDs matter

SVG references use id values for defs, masks, clipPaths, gradients, symbols, and use elements. Duplicate IDs make references ambiguous, especially when multiple SVGs are inlined on one page.

Report format

The checker lists unique ID counts, duplicate values, and a JSON report with counts for each detected ID.