Online URL Encoder & Decoder – Encode, Decode, Base64 & Query Strings Instantly
Looking for a fast, accurate, and easy-to-use URL Encoder and Decoder? This free online tool lets you instantly encode or decode URLs, query strings, form parameters, Base64 text, and URI components. Whether you're a developer, marketer, or student, this tool helps you debug URLs, fix encoding issues, and generate correctly formatted links—all in seconds.
What Is URL Encoding?
URL encoding (also called percent-encoding) replaces unsafe characters in URLs with%xx values. For example, a space becomes %20. This ensures URLs remain safe, valid, and compatible across browsers, APIs, and servers.
What Does This Tool Do?
This tool supports multiple encoding & decoding modes:
- Encode / Decode URI Components – For path and query parameters
- Encode / Decode Entire URLs – For full URLs containing special characters
- Form Encoding – application/x-www-form-urlencoded (spaces → +)
- Base64 & Base64 URL-safe – Encode or decode text in Base64 variants
- Query ↔ JSON Converter – Convert JSON objects into query strings and vice versa
- Bulk Mode – Process multiple lines at once
- File Upload Support – Upload TXT or JSON and encode/decode easily
- Shareable URL Mode – Share your encoded text instantly
Why Use This URL Encoder / Decoder?
- ✔ 100% Free, Unlimited Usage
- ✔ No ads inside the tool area
- ✔ Works completely offline once loaded
- ✔ Developer-friendly with accurate encoding logic
- ✔ Privacy-focused — your data is never sent to any server
- ✔ Supports advanced formats like Base64 URL-safe and Form Encoding
Common Use Cases
- 🔗 Encoding URLs before sharing or embedding in HTML
- 📡 Preparing query parameters for REST API requests
- 🛒 Fixing broken URLs used in affiliate links & marketing tools
- 📝 Converting JSON objects into shareable query strings
- 🔐 Decoding complex parameters like JWT, Base64, and OAuth strings
- 📂 Cleaning data imported from CSV / TXT files
How to Use the URL Encoder / Decoder
- Type or paste your text into the input area
- Select Encode or Decode
- Choose the mode: URI Component, Full URI, Form, Base64, Base64 URL, Query String
- Click Run to convert
- Copy or download the output as TXT / JSON
Safe, Secure & Private
Everything runs directly in your browser. Nothing is uploaded, saved, or stored on any server. This makes the tool suitable for handling sensitive URLs, tokens, and query parameters.
Frequently Asked Questions (FAQ)
1. What is URL Encoding used for?
URL encoding ensures that URLs containing special characters—such as spaces, emojis, symbols, or non-English characters—are safely transmitted over the internet. It prevents errors in APIs, browsers, servers, and email clients.
2. What is the difference between encodeURI and encodeURIComponent?
encodeURIComponent encodes every unsafe character, and is ideal for parameters like ?q=hello world.
encodeURI leaves certain characters unencoded (like /, :, #) and is ideal for full URLs.
3. What is Base64 URL-safe encoding?
Base64 URL-safe replaces + with - and / with _so the string becomes safe to use inside URLs, JWT tokens, and query parameters.
4. Is this tool safe to use for sensitive data?
Yes. Everything runs locally inside your browser. No data is sent or stored on any server, making it safe for tokens, keys, or confidential URLs.
5. Can I convert JSON to a query string?
Yes. This tool includes a JSON ↔ Query String converter. Simply paste your JSON object and choose “Query” mode.
6. Do you support bulk encoding?
Yes. Enable “Bulk mode” to encode or decode multiple lines at once. Ideal for logs, datasets, and exported files.
7. Why do some URLs show %20 while others show +?
%20 is standard URL encoding, while + is used inform submissions (application/x-www-form-urlencoded). This tool supports both.
8. Can I upload a file?
Yes. Upload TXT or JSON files and instantly encode/decode them with one click.