Free, browser-based utilities for everyday developer workflows

URL Encode Query Strings

Encode and decode query strings safely for tracking links and APIs.

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Open URL Encoder with a ready-to-run example.

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When you need this
  • You need to safely encode query strings for redirects.
  • You are troubleshooting encoded URLs from logs.
  • You want to encode spaces and special characters correctly.
How to do it with Daily Developer Tools
  • Paste the raw text or query string into the URL Encoder.
  • Click Encode or Decode depending on your need.
  • Copy the result into your app or request.
Tips / common pitfalls
  • Encode full query strings when you need to pass them as a single value.
  • Decode before editing to avoid double-encoding errors.
  • Use the URL Parser to inspect parameters after decoding.
Examples & test data

Encode a query string

Mode: encode
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Input example
email=alex@example.com&notes=needs follow up
Expected output
email%3Dalex%40example.com%26notes%3Dneeds%20follow%20up

Decode an encoded value

Mode: decode
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Input example
utm_source%3Dnewsletter%26utm_campaign%3Dwinter%2520sale
Expected output
utm_source=newsletter&utm_campaign=winter%20sale
FAQ
What does URL encoding do?

It replaces reserved characters with %xx escapes so URLs remain valid.

Why do I see %20 instead of spaces?

%20 is the encoded form of a space character.

Can I decode + signs?

Yes. The tool normalizes + to spaces when decoding.

Does the tool store my input?

No. It runs locally in your browser. No uploads.

Related tools
URL Parser Encoding Suite HTTP Headers Parser

Privacy-first: runs locally in your browser. No uploads.

How to use URL Encode Query Strings

Paste a query string value — a URL, a parameter value with spaces and special characters, or a raw string — into the input and click Encode. The tool percent-encodes it correctly using encodeURIComponent rules so it is safe to use in a URL.

Common use cases

Frontend developers use this to encode user-supplied search terms and filter values before appending them to API request URLs. Backend developers use it to verify correct encoding of redirect URIs in OAuth flows, and QA engineers use it to construct edge-case test URLs with unusual character inputs.

Why run this in your browser?

All processing happens locally in your browser. Your data never leaves your machine, making it safe for sensitive payloads, internal API responses, and confidential configurations.