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URL Encoder / Decoder

100% Private — No Data UploadedRuns Instantly in Your BrowserZero Server Processing
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Encoded output will appear here

Developer Safe

Your URLs and text are encoded and decoded strictly within your browser session. Zero data logging, zero server uploads, zero third-party access.

How the URL Encoder / Decoder Works

Our URL Encoder / Decoder is a fast, developer-first utility designed for web developers, API integrators, QA engineers, and anyone who works with URL-encoded data. Whether you are building REST APIs, debugging query parameters, encoding form data, or decoding percent-encoded strings from logs, this tool delivers instant, accurate results with zero friction.

The tool features three powerful modes. URL Encode converts any text into a percent-encoded format safe for use in URLs, replacing spaces with %20, special characters with %XX hex sequences, and non-ASCII characters with UTF-8 byte sequences. URL Decode reverses the encoding process, converting percent-encoded sequences back into human-readable characters. Query Parameters mode lets you paste a raw query string like "?name=John%20Doe&age=30" to instantly extract and display every key-value pair in a clean table. Alternatively, you can build a query string by adding individual key-value pairs and clicking Build to generate a properly encoded URL query component.

Everything runs entirely in your browser using the browser-native encodeURIComponent and decodeURIComponent APIs. Your URLs, text, and query data are never transmitted, logged, or stored on remote servers. This makes our URL Encoder / Decoder ideal for encoding sensitive API keys, tokens, and internal URLs in air-gapped or high-security environments.

Why Use Our URL Encoder / Decoder?

Instant Encode / Decode

Type or paste any string and get the encoded or decoded result in milliseconds. No configuration, no setup.

Query Parameter Builder

Parse complex query strings into clean tables, or build properly encoded query strings from individual key-value pairs.

Graceful Error Handling

Decode malformed URLs without crashes. Get clear, actionable error messages when percent-encoding is invalid.

Zero Server Contact

Your URLs and strings are processed entirely inside your browser. Nothing is uploaded, logged, or shared.

Developer-First UX

Monospace output, clean tables for query params, one-click copy, and tabbed mode switching built for engineers.

Works Offline

Once loaded, the encoder and decoder run without any internet connection. Perfect for secure networks.

Frequently Asked Questions

Is this URL Encoder / Decoder free to use?
Yes, our URL Encoder / Decoder is completely free to use with no hidden fees, no sign-ups, and no usage limits. Encode, decode, and format as many URLs and strings as you need, as often as you need.
Is my data safe when using this tool?
Absolutely. This URL Encoder / Decoder runs entirely in your browser using client-side JavaScript. Your text and URLs are never uploaded to any server, stored in a database, or shared with third parties. Your data never leaves your device.
What is the difference between URL Encode and Decode?
URL Encoding converts special characters, spaces, and non-ASCII characters into a format that is safe for use in URLs using percent-encoding (e.g., "hello world" becomes "hello%20world"). URL Decoding reverses that process, converting percent-encoded sequences back into readable characters (e.g., "hello%20world" becomes "hello world").
What does the Query Parameters mode do?
Query Parameters mode lets you format key-value pairs into a valid URL query string and vice versa. Paste a raw query string like "?name=John&age=30" to get a clean formatted table of keys and values. Or type individual key-value pairs to build a properly encoded query string automatically.
Does this tool work offline?
Once the page is loaded, the URL Encoder / Decoder functions entirely within your browser and does not require an internet connection to encode, decode, or format your data. Perfect for working on airplanes, in secure environments, or with spotty WiFi.

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