URL Encoder/Decoder
Use URL Encoder/Decoder to encode and decode urls — free, immediate, and with nothing to install. Parsing, formatting and validation all run in your browser, so API keys, tokens and internal payloads are never transmitted. It is used most by backend engineers inspecting an API response mid-debug. Reports the line and position of a syntax error instead of failing silently. Nothing is gated: no signup wall, no trial period, no upgrade prompt.
Key features
- Reports the line and position of a syntax error instead of failing silently.
- Handles large payloads — several megabytes of JSON is fine.
- Works on desktop, tablet and phone — no separate app to install.
- No ads interrupting the tool itself, and no upsell before the result.
How to use URL Encoder/Decoder
- Paste your input: Drop the payload, code or value into the box above.
- Run it: Press the action button — errors are reported with their position.
- Take the output: Copy the result, or download it when the output is a file.
Frequently asked questions
- How large an input can it take? — Several megabytes is routine. The limit is your browser's memory, not a server quota.
- Does it follow the official spec? — Yes — the published specification, not a simplified version, so results match your language's own parser.
- Is there a rate limit? — None. There is no server involved, so nothing to limit.
- Can I use it at work? — Yes, and the local-only processing is usually what makes it acceptable under a company data policy.