Uwarp

Component mode is best for query values. Full URI keeps : / ? & = # intact. %20 is a space; %40 is @; %25 is %.

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URL encoder & decoder

Encode or decode URLs online—percent-encode query strings and special characters. Local-first. No signup.

What is a URL encoder/decoder?

A URL encoder (also searched as urlencoder, url decode, or encode decode URL) percent-encodes special characters for safe transport in addresses and query strings, and can decode them back. Use this free local-first URL encoder and decoder when debugging params or building links—no signup.

URL encoder & decoder features

Percent-encode and decode in the browser.

  • Encode and decode

    Switch modes to turn text into %HH sequences or back again.

  • Component or full URI

    Match encodeURIComponent or encodeURI depending on the job.

  • Form-style +

    Optional + for spaces when working with form-urlencoded strings.

  • Instant copy

    Results update as you type—copy, download, or open in a tab.

How to encode or decode a URL

From paste to copy-ready output.

  1. Choose encode or decode

    Encode for query values and unsafe characters; decode to read them again.

  2. Paste your string

    Drop in plain text, a query fragment, or a percent-encoded URL.

  3. Copy the result

    Grab the output for APIs, redirects, or debugging request params.

Tips for URL encode / decode

Avoid common percent-encoding mistakes.
  • 01

    Encode values, not whole URLs blindly

    Encoding an entire https://… with component mode breaks the structure—use Full URI or encode only the query value.

  • 02

    Double-encoding

    Decoding twice can leave %25 artifacts. Encode once at the boundary that needs it.

  • 03

    Know %20 vs +

    Path and modern query builders prefer %20; classic forms may use +.

  • 04

    Debug with decode

    Paste opaque query strings here to reveal the real parameter values.

Great for

When a URL encoder/decoder helps.

  • Query strings

    Prepare safe parameter values for APIs and redirects.

  • Debugging requests

    Decode logs and HAR params into readable text.

  • Non-ASCII text

    Percent-encode Unicode for URLs that must stay ASCII-safe.

Why encode URLs here

Fast local URL encode and decode.

  • Local-first

    Strings never leave the browser for this tool.

  • Free

    Unlimited encode/decode with no signup.

  • Both directions

    URL encoder and decoder in one place.

  • Browser-accurate

    Uses the same encodeURI* APIs your front-end code calls.

Technical notes

How this URL codec works.
APIs
encodeURIComponent / decodeURIComponent or encodeURI / decodeURI.
Form style
Optional %20 ↔ + mapping for application/x-www-form-urlencoded.
Errors
Malformed percent sequences surface as a clear decode error.
Privacy
Client-side only—no network upload.

Sources & References

Percent-encoding and URI references.
  • “The encodeURIComponent() function encodes a URI by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character.”
    — MDN Web Docs — encodeURIComponent()

    MDN — encodeURIComponent(): Documents the component-encoding API this tool uses for query values. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent

  • “The decodeURIComponent() function decodes a Uniform Resource Identifier (URI) component previously created by encodeURIComponent() or by a similar routine.”
    — MDN Web Docs — decodeURIComponent()

    MDN — decodeURIComponent(): Documents decoding percent-encoded UTF-8 sequences back to text. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent

  • “A percent-encoded octet is encoded as a character triplet, consisting of the percent character "%" followed by the two hexadecimal digits representing that octet's numeric value.”
    — IETF RFC 3986

    RFC 3986 — Percent-Encoding: Defines the percent-encoding rules behind URL encode and decode. rfc-editor.org/rfc/rfc3986#section-2.1

Frequently Asked Questions

Quick answers about this tool—open a question to read more.