URL Query String Builder

Manually building UTM links is how broken tracking links happen.

Manually building a URL with query parameters by string concatenation — adding a '?' or '&' by hand and hoping the value doesn't contain a character that breaks the URL — is a common source of broken tracking links, especially once a parameter value contains a space, an ampersand, or another URL-reserved character. This tool uses the browser's native URL and URLSearchParams API to build the final URL, guaranteeing correct percent-encoding of every parameter value and correctly merging with any query parameters already present in the base URL, rather than risking a malformed link from manual string building.

• →Uses the browser's native URL/URLSearchParams API for guaranteed-correct encoding
• →Pre-seeded with common UTM parameter fields as a starting point
• →Correctly merges with any query parameters already present in your base URL
• →Shows the percent-encoded value of each parameter so you can verify exactly what will be sent
• →Watermarked by Cikal Studio Labs · Works on any device, no install required