Do I need an account?

No. Guests can encode and decode URLs freely.

What is component mode?

It uses encodeURIComponent, which is safer for query parameter values than encoding a full URL.

The string may contain an invalid percent sequence. Check for incomplete % encodings.

No. Percent-encoding only makes strings URL-safe.

In browser

Percent-encode URLs or decode query strings safely.

Free for guests — processing stays on this device.

Encode as URI component (safer for query values)Input

Output

URL · Query string

Paste a URL or query value, encode or decode it, and copy the result. Component mode is safer when the string is a single query parameter.

Do I need an account?: No. Guests can encode and decode URLs freely.
What is component mode?: It uses encodeURIComponent, which is safer for query parameter values than encoding a full URL.
Why decode failed?: The string may contain an invalid percent sequence. Check for incomplete % encodings.
Is this encryption?: No. Percent-encoding only makes strings URL-safe.
Is it free?: Yes.

Nothing is uploaded. Encoding stays in your browser.

Encode · In browser

Encode or decode Base64 text without uploading anything.