BBestMint

Query String Builder

Build a URL query string from key/value rows — or parse one into rows.

Edit a list of (key, value) pairs and the tool emits a properly URL-encoded query string. Or paste an existing query string to populate the rows for editing. No more wrestling with manual percent-encoding.

Common use cases

  • Build the right ?utm_source=...&utm_campaign=... string for a campaign URL
  • Compose a complex API query without escaping by hand
  • Edit an existing share URL by parsing it into rows
  • Test how a server handles repeated keys or empty values

Frequently asked questions

Does it handle special characters?▾
Yes — values are URL-encoded with URLSearchParams, so spaces, &, = and unicode are escaped correctly.
Can I have repeated keys?▾
Yes. Multiple rows with the same key produce ?k=a&k=b, which is how arrays are typically passed in query strings.
What's the leading ??▾
We include the leading ? for convenience when copying. Strip it if you're appending to a URL that already has one.

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