URL Encoder Decoder Online Free

Encode or decode text and URLs with standard JavaScript (encodeURIComponent, encodeURI) and UTF-8 Base64. Below, the URL parser breaks the link into protocol, host, path, UTM and query parameters, and fragment in a clear table — handy for landing pages, redirects and support, without leaving the browser.

Everything runs 100% locally: your strings are not sent to our servers. Real-time output and one-click copy.

100% in your browser — no data sent to server.

Encoder / decoder below; scroll to the URL parser for a row-per-parameter view (including UTMs).

Encoding type

Examples: space → %20 · & → %26 · = → %3D · @ → %40

Companion tool

URL parser

URL parser: paste a full address (with ?, &, UTMs, hash after #) to show protocol, domain, path, fragment and a key / value table of every query parameter — useful for marketing links, tracking and technical debugging.

How it works

  1. Encode: pick the right mode (parameter value → encodeURIComponent; full URL → encodeURI; other → Base64).
  2. Decode: paste percent-encoding or Base64; detection is automatic.
  3. URL parser: paste the link in the second panel; read every segment and parameter (utm_source, utm_medium, gclid, etc.) without a spreadsheet or extension.
  4. Copy: the blue button under each result copies the “Result” field to the clipboard.

Frequently asked questions

How to encode a URL online?
Encode mode: paste the text and choose the type; the result is real-time.
What is the difference between encodeURI and encodeURIComponent?
encodeURI keeps the URL structure; encodeURIComponent encodes each value segment.
How to decode an encoded URL?
Decode mode: the browser tries decodeURIComponent, decodeURI or Base64 depending on the content.
How to encode to Base64?
Select Base64 in Encode mode.
How to decode URL parameters?
Use the URL parser: the table lists each key and value in the query string, including UTMs.
What is the URL parser for?
It visually splits protocol, host, path, fragment and parameters. Handy to verify a landing URL, compare two links or explain a redirect — all locally.
When should I use encodeURIComponent instead of encodeURI?
For a value (password, label, token) to put in a query string, use encodeURIComponent. encodeURI suits a structured URL you want to keep readable.
Is my data sent to your servers?
No: encoding, decoding and parsing use JavaScript only in your browser.
How do I spot double encoding?
If you see sequences like %2520 instead of %20, the string was encoded twice. Start from plain text, encode once, or use Decode mode to inspect.
Does Decode mode handle Base64?
Yes, when the input looks like Base64 (no % and no URL scheme), the output is UTF-8 decoded text.
Why encode characters in a URL?
Spaces, non-ASCII characters and reserved symbols (&, =, #) must be percent-encoded so servers and browsers interpret the request correctly.