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Text Title Case vs Sentence Case Know which style to use in headings, buttons, filenames and code. Developer URL Encoding Query Parameters Fix broken links with spaces, ampersands, hashes and Unicode. Math Unit Conversion Formulas Convert metric, imperial, temperature and speed without guessing. Health BMI Formula Metric and Imperial Calculate adult BMI and understand why it is only a screening number. Finance Loan Payment Formula Estimate monthly payment, total interest and full repayment cost. Developer Convert JSON to CSV Prepare JSON arrays for Excel, Google Sheets and database imports.
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Free Online Tools for Developers & Productivity

ToolZone is a curated collection of 28 free online tools for developers, designers, writers, and everyday productivity. Every tool runs entirely in your browser — no signup, no uploads. Your tool input never leaves your device.

Format and validate JSON, generate strong passwords, encode and decode Base64 or URLs, test regular expressions, convert colors, build CSS gradients, calculate BMI or age, generate Lorem Ipsum, hash text with MD5 or SHA-256, and more — all from a single fast, private, dark-themed workspace.

Whether you're a developer needing quick utilities, a designer working with colors and gradients, or a writer counting words and characters, ToolZone gives you instant, low-clutter access to professional-grade web tools that work offline once loaded.

Free URL Encoder & Decoder

Convert URLs and query strings to and from percent-encoded form. Required when you pass user input through a URL, build query strings, or debug links that contain special characters like spaces, &, ?, # or non-ASCII text.

Features

How to use

  1. Step 1. Paste a URL or query string.
  2. Step 2. Click Encode or Decode.
  3. Step 3. Copy the result for use in your link or code.

Real use case: a UTM link that breaks when the campaign name has a space

A marketer builds a tracking link with utm_campaign=spring sale 2026. Pasted into a chat app, the URL breaks at the first space and half the parameters are lost, so the campaign reports as direct traffic.

Encoding the parameter value turns it into spring%20sale%202026, producing a link that survives copy-paste through email, Slack and QR codes. Later, reading a raw analytics export full of %E2%9C%94 sequences, the same tool decodes them back to human-readable campaign names.

How URL Encoder / Decoder works

Percent-encoding replaces every byte that is not an unreserved character (A–Z a–z 0–9 - _ . ~) with a % followed by its two-digit hexadecimal value, after the text is converted to UTF-8. A space becomes %20; the check mark ✔ becomes the three-byte sequence %E2%9C%94.

The tool exposes both encodeURIComponent semantics — which escapes &, =, ? and / because they are meaningful inside a parameter value — and full-URL encoding, which preserves the structural characters so a complete address stays clickable. Choosing the wrong one is the most common source of broken links.

Decoding applies the inverse and reports invalid sequences (a stray % not followed by two hex digits) instead of guessing. Everything runs in the browser.

URL Encoder / Decoder vs similar tools

Where each URL-encoding option makes sense:

ToolHow it worksTrade-off
encodeURIComponent in devtoolsOne-line call in the browser console.Fast for developers, but no visible distinction between component and full-URL encoding.
Campaign URL buildersAssemble UTM links from a form and encode automatically.Tied to one link format; cannot decode an arbitrary string you were given.
ToolZone URL Encoder / DecoderEncode or decode any string or full URL, both directions, no install.Manual — it does not rewrite links across a site.

Frequently Asked Questions

What characters need encoding?

Spaces, &, ?, =, #, /, +, and any non-ASCII character should be percent-encoded when used inside a URL parameter.

encodeURI vs encodeURIComponent?

encodeURI leaves URL structure characters (: / ?) alone; encodeURIComponent encodes them too. Use the latter for query-string values — that's what this tool uses.

Related Developer tools

JSON FormatterBase64 Encoder / DecoderHTML Encoder / DecoderRegex Tester

Guides worth reading

URL Encoding Query ParametersHow to Validate JSON and Fix Common Syntax ErrorsBase64 Is Not Encryption: What It Actually DoesHow to Decode a JWT Safely

Browse all ToolZone guides →