diff --git a/src/pages/tools/string/statistic/service.ts b/src/pages/tools/string/statistic/service.ts
new file mode 100644
index 0000000..8ff971b
--- /dev/null
+++ b/src/pages/tools/string/statistic/service.ts
@@ -0,0 +1,110 @@
+import { InitialValuesType } from './types';
+import { TopItemsList } from '../../list/find-most-popular/service';
+
+function countLines(text: string, options: InitialValuesType): number {
+  const numberofLines = options.emptyLines
+    ? text.split('\n').length
+    : text.split('\n').filter((line) => line.trim() !== '').length;
+
+  return numberofLines;
+}
+
+function countCharacters(text: string): number {
+  return text.length;
+}
+
+function countSentences(text: string, options: InitialValuesType): number {
+  const sentenceDelimiters = options.sentenceDelimiters || [
+    '.',
+    '!',
+    '?',
+    '...'
+  ];
+  const regex = new RegExp(`[${sentenceDelimiters.join('')}]`, 'g');
+  const sentences = text
+    .split(regex)
+    .filter((sentence) => sentence.trim() !== '');
+  return sentences.length;
+}
+
+function wordsStats(
+  text: string,
+  options: InitialValuesType
+): [number, string] {
+  const defaultDelimiters = `\\s.,;:!?"“”«»()…`;
+  const wordDelimiters = options.wordDelimiters || defaultDelimiters;
+  const regex = new RegExp(`[${wordDelimiters}]`, 'gu');
+  const words = text.split(regex).filter((word) => word.trim() !== '');
+
+  const wordsFrequency = TopItemsList(
+    'regex',
+    'count',
+    'percentage',
+    '',
+    words,
+    false,
+    true,
+    false
+  );
+
+  return options.wordCount
+    ? [words.length, wordsFrequency]
+    : [words.length, ''];
+}
+
+function countParagraphs(text: string): number {
+  return text
+    .split(/\r?\n\s*\r?\n/)
+    .filter((paragraph) => paragraph.trim() !== '').length;
+}
+
+function charactersStatistic(text: string, options: InitialValuesType): string {
+  if (!options.characterCount) return '';
+  const result = TopItemsList(
+    'symbol',
+    'count',
+    'percentage',
+    '',
+    text,
+    true,
+    true,
+    false
+  );
+  return result;
+}
+
+export function textStatistics(
+  input: string,
+  options: InitialValuesType
+): string {
+  if (!input) return '';
+
+  const numberofLines = countLines(input, options);
+  const numberofCharacters = countCharacters(input);
+  const numberofSentences = countSentences(input, options);
+  const [numberofWords, wordsFrequency] = wordsStats(input, options);
+  const numberofParagraphs = countParagraphs(input);
+  const characterStats = charactersStatistic(input, options);
+
+  const stats = `Text Statistics
+==================
+Characters: ${numberofCharacters}
+Words: ${numberofWords}
+Lines: ${numberofLines}
+Sentences: ${numberofSentences}
+Paragraphs: ${numberofParagraphs}`;
+
+  const charStats = `Characters Frequency
+==================
+${characterStats}`;
+
+  const wordStatsOutput = `Words Frequency
+==================
+${wordsFrequency}`;
+
+  let result = stats;
+  if (options.wordCount) result += `\n\n${wordStatsOutput}`;
+  if (options.characterCount) result += `\n\n${charStats}`;
+
+  return result;
+}