feat (string): url decode

src/pages/tools/string/url-decode/index.tsx

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+import { useState } from 'react';
+import ToolTextResult from '@components/result/ToolTextResult';
+import { decodeString } from './service';
+import ToolTextInput from '@components/input/ToolTextInput';
+import ToolContent from '@components/ToolContent';
+import { CardExampleType } from '@components/examples/ToolExamples';
+import { ToolComponentProps } from '@tools/defineTool';
+import { useTranslation } from 'react-i18next';
+
+const initialValues = {};
+
+const exampleCards: CardExampleType<typeof initialValues>[] = [
+  {
+    title: 'Decode an actual URL',
+    description:
+      'This example decodes a URL-encoded string back to its readable URL form.',
+    sampleText: 'https%3A%2F%2Fomnitools.app%2F',
+    sampleResult: 'https://omnitools.app/',
+    sampleOptions: initialValues
+  },
+  {
+    title: 'Decode All Characters',
+    description:
+      'This example decodes a string where every character has been URL-encoded, restoring the original readable text.',
+    sampleText:
+      '%49%20%63%61%6E%27%74%20%62%65%6C%69%65%76%65%20%69%74%27%73%20%6E%6F%74%20%62%75%74%74%65%72%21',
+    sampleResult: "I can't believe it's not butter!",
+    sampleOptions: initialValues
+  }
+];
+
+export default function DecodeString({
+  title,
+  longDescription
+}: ToolComponentProps) {
+  const { t } = useTranslation('string');
+  const [input, setInput] = useState<string>('');
+  const [result, setResult] = useState<string>('');
+
+  function compute(_initialValues: typeof initialValues, input: string) {
+    setResult(decodeString(input));
+  }
+
+  return (
+    <ToolContent
+      title={title}
+      initialValues={initialValues}
+      getGroups={null}
+      compute={compute}
+      input={input}
+      setInput={setInput}
+      inputComponent={
+        <ToolTextInput
+          title={t('urlDecode.inputTitle')}
+          value={input}
+          onChange={setInput}
+        />
+      }
+      resultComponent={
+        <ToolTextResult title={t('urlDecode.resultTitle')} value={result} />
+      }
+      toolInfo={{
+        title: t('urlDecode.toolInfo.title', { title }),
+        description: longDescription
+      }}
+      exampleCards={exampleCards}
+    />
+  );
+}

src/pages/tools/string/url-decode/meta.ts

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+import { defineTool } from '@tools/defineTool';
+import { lazy } from 'react';
+
+export const tool = defineTool('string', {
+  path: 'url-decode-string',
+  icon: 'codicon:symbol-string',
+
+  keywords: ['uppercase'],
+  component: lazy(() => import('./index')),
+  i18n: {
+    name: 'string:urlDecode.toolInfo.title',
+    description: 'string:urlDecode.toolInfo.description',
+    shortDescription: 'string:urlDecode.toolInfo.shortDescription',
+    longDescription: 'string:urlDecode.toolInfo.longDescription'
+  }
+});

src/pages/tools/string/url-decode/service.ts

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+export function decodeString(input: string): string {
+  if (!input) return '';
+
+  let result = '';
+  let i = 0;
+
+  while (i < input.length) {
+    if (input[i] === '%' && i + 2 < input.length) {
+      const hex = input.substring(i + 1, i + 3);
+      const code = parseInt(hex, 16);
+      result += String.fromCodePoint(code);
+      i += 3;
+    } else {
+      result += input[i];
+      i++;
+    }
+  }
+
+  return result;
+}