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URL Encoder & Decoder — Percent-Encode URLs & Query Strings

Encode and decode URLs and query string parameters. Percent-encoding for safe transmission.

Free No signup Client-side Privacy friendly Updated

How to use

  1. 1 Pick Encode or Decode mode.
  2. 2 Choose Component for query params, or Full URL for entire URLs.
  3. 3 Paste your input and copy the result.

Why use this tool

  • Two variants — encodeURIComponent for individual params, encodeURI for full URLs.
  • Real-time bidirectional — switch modes and swap input/output in one click.
  • Runs in your browser — your URLs stay private.
  • Free, no signup, no ads.

Frequently asked questions

When should I use encodeURIComponent vs encodeURI?

Use encodeURIComponent for query string values and path segments (encodes / ? & = #). Use encodeURI for an entire URL string when you want to preserve those structural characters.

Does this support special characters?

Yes — full Unicode support. Emoji, CJK, Arabic, and combining characters are all encoded correctly.

Why does my decode fail?

Invalid percent-encoding (e.g. "%XY" where XY isn't valid hex) throws a URIError. Check that every "%" is followed by exactly 2 hex digits.

What is URL Encoder & Decoder?

A URL Encoder & Decoder is a tool that converts text and query-string parameters to and from percent-encoded form, replacing reserved or unsafe characters with %-prefixed escape sequences so values transmit safely within a URL. It also reverses the process to recover the original text. It runs entirely in the browser, keeping the input on the user's device.

How URL Encoder & Decoder compares to alternatives

URL Encoder & Decoder versus typical browser and desktop alternatives — features compared at a glance.
Feature Zerethon Tools Typical online tools Desktop apps
Signup required No Sometimes No
Data leaves device No Yes No
Encode + decode Both Both Both
Component vs full-URL mode Yes Sometimes Sometimes
Free Yes Yes (with ads) Sometimes paid
Works offline Yes (after load) No Yes
Summary

URL Encoder & Decoder is a free 開発者 utility by Zerethon Tools. Encode and decode URLs and query string parameters. Percent-encoding for safe transmission. Runs entirely in the browser — no signup, no upload.

Category
開発者
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. URL Encoder & Decoder runs entirely client-side — no server upload, no logging, no tracking of your input.

Compare

Base64 vs URL encoding

Learn the basics

What is Base64? What is URL encoding?

How-to guides

How to decode base64 How to encode a url

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