URL Decoder
Decode URL-encoded strings.
Decode URL-encoded strings.
This free URL Decoder from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the URL Decoder
- Pick the algorithm or generation options.
- Enter your input (or click "Generate" for random output).
- Click the action button - the result appears instantly.
- Copy the result. Never paste sensitive secrets into the input again afterwards.
What you can do with the URL Decoder
- Generate strong passwords for new accounts.
- Hash data for verifying file integrity.
- Encode binary in Base64 for inline embedding.
- Test bcrypt or MD5 outputs while building auth systems.
Why use KX Toolkit's URL Decoder
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Always check the URL bar before pasting sensitive data - KX Toolkit's crypto tools run client-side, but you should still verify you're on the right domain.
Related Password & Encryption
If you find this tool useful, explore the full Password & Encryption collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
Why does decoding sometimes leave plus signs in the output?
The standard JavaScript decoder, decodeURIComponent, treats plus as a literal plus. In the form-encoded variant used by query strings, plus represents a space. If you decoded a query string and see plus where you expected spaces, your input was form-encoded and you need a decoder that understands that variant - or replace plus with space before passing the value through the standard decoder.
Can decoding fail and produce an error?
Yes. If the input contains a percent sign that is not followed by two valid hex digits, decoding throws a malformed URI exception. This usually means the URL was truncated, double-encoded, or copied with a stray percent. Run a sanity check first by looking for any percent that does not have two hex digits after it, and re-encode if you suspect double-encoding produced the corrupted state.
What is double-encoding and how do I fix it?
Double-encoding happens when an already-encoded URL is passed through an encoder again, turning every percent sign into %25 and every escape into %2520 or longer. Run the decoder twice in a row to recover the original string. This often appears when one layer of code encodes a parameter and a downstream library encodes the entire URL again. Inspect the data flow to remove the redundant encoding step.
Is the decoded output safe to render in HTML?
Not without escaping. URL decoding gives you the original characters, which may include angle brackets, quotes, or script tags that would break or attack a page if inserted directly into HTML. Always pass user-supplied decoded values through an HTML escaper before rendering, or insert them via textContent instead of innerHTML in JavaScript. URL decoding and HTML escaping are independent steps.
Does the decoder process my URL on a server?
No. Decoding happens in your browser using built-in JavaScript primitives. The URL you paste, including any tokens or sensitive query parameters, never leaves your device. This makes the tool safe for inspecting the contents of OAuth callback URLs, signed download links, and other strings that you would not want to share with a remote service.
How do I decode multibyte characters correctly?
The decoder assumes UTF-8, which matches modern web standards. A non-ASCII character in the original was percent-encoded as multiple bytes - three escapes for most CJK characters, two for Latin accented letters - and the decoder reassembles them back into the original Unicode code points. If your decoded output looks corrupted, the source was likely encoded as Latin-1 instead of UTF-8 and needs a different decode pipeline.
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