diff --git a/convert.ts b/convert.ts
new file mode 100644
index 0000000..26f028e
--- /dev/null
+++ b/convert.ts
@@ -0,0 +1,125 @@
+import { I18NEntry, SingleI18NEntry, PluralI18NEntry } from 'i18n-proto';
+
+export type Metadata = {
+  copyrightSubject: string,
+  bugsEmail: string,
+  year: number
+};
+
+export function makeDate(date: Date) {
+  const timezoneShift = date.getTimezoneOffset() / -60;
+  let tz = 'Z';
+  if (timezoneShift !== 0) {
+    tz = (timezoneShift > 0 ? '+' : '-') +
+      (timezoneShift > 9 ? '' : '0')
+      + timezoneShift + '00';
+  }
+
+  return date.getFullYear() + '-' +
+    (date.getMonth() > 9 ? '' : '0') + date.getMonth() + '-' +
+    (date.getDay() > 9 ? '' : '0') + date.getDay() + ' ' +
+    (date.getHours() > 9 ? '' : '0') + date.getHours() + ':' +
+    (date.getMinutes() > 9 ? '' : '0') + date.getMinutes() +
+    tz;
+}
+
+export function convert(json: string, meta: Metadata): string {
+  const document: I18NEntry[] = JSON.parse(json);
+  let poEntries: PotEntry[] = [];
+
+  // 1) Make POT header
+  let poHeader =
+    `# Translations template for PROJECT.
+# Copyright (C) ${meta.year} ${meta.copyrightSubject}
+# This file is distributed under the same license as the PROJECT project.
+# FIRST AUTHOR <EMAIL@ADDRESS>, ${meta.year}.
+# 
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PROJECT VERSION\\n"
+"Report-Msgid-Bugs-To: ${meta.bugsEmail}\\n"
+"POT-Creation-Date: ${makeDate(new Date())}\\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\\n"
+"Language-Team: LANGUAGE <LL@li.org>\\n"
+"MIME-Version: 1.0\\n"
+"Content-Type: text/plain; charset=utf-8\\n"
+"Content-Transfer-Encoding: 8bit\\n"
+"Generated-By: i18n-json2po\\n"
+
+`;
+
+  // 2) Make POT entries
+  for (let item of document) {
+    let potEntry = new PotEntry();
+    if (item.type === 'single') {
+      potEntry.parseSingleEntry(item);
+    }
+    if (item.type === 'plural') {
+      potEntry.parsePluralEntry(item);
+    }
+    poEntries.push(potEntry);
+  }
+
+  return poHeader + poEntries
+    .map((entry) => entry.asString())
+    .join("\n\n");
+}
+
+export class PotEntry {
+  private items: string[] = [];
+
+  protected addComment = (comment: string) => this.items.push('#. ' + comment);
+  protected addOccurence = (occ: string) => this.items.push('#: ' + occ);
+  protected addContext = (context: string) => this.items.push('msgctxt ' + JSON.stringify(context));
+  protected addMsgid = (id: string) => this.items.push('msgid ' + JSON.stringify(id));
+  protected addMsgidPlural = (id: string) => this.items.push('msgid_plural ' + JSON.stringify(id));
+  protected addMsgstr = () => this.items.push('msgstr ""');
+  protected addMsgstrPlural = (count: number) => {
+    for (let i = 0; i < count; i++) {
+      this.items.push('msgstr[' + i + '] ""');
+    }
+  };
+
+  public asString = () => this.items.join("\n");
+
+  public parseSingleEntry({ entry, comments, occurences, context, type }: SingleI18NEntry) {
+    if (comments) {
+      comments.forEach(this.addComment);
+    }
+
+    if (occurences) {
+      occurences.forEach(this.addOccurence);
+    }
+
+    if (context) {
+      this.addContext(context);
+    }
+
+    if (type === 'single') {
+      this.addMsgid(entry);
+      this.addMsgstr();
+    }
+  }
+
+  public parsePluralEntry({ entry, comments, occurences, context, type }: PluralI18NEntry) {
+    if (comments) {
+      comments.forEach(this.addComment);
+    }
+
+    if (occurences) {
+      occurences.forEach(this.addOccurence);
+    }
+
+    if (context) {
+      this.addContext(context);
+    }
+
+    if (type === 'plural') {
+      this.addMsgid(entry[0]);
+      this.addMsgidPlural(entry[entry.length - 1]);
+      this.addMsgstrPlural(entry.length);
+    }
+  }
+}
diff --git a/index.ts b/index.ts
index e69de29..2c2703e 100644
--- a/index.ts
+++ b/index.ts
@@ -0,0 +1,76 @@
+import * as cli from 'cli';
+import { readFile, writeFile } from 'fs';
+import { convert } from './convert';
+
+const options = cli.parse({
+  src: ['s', 'A source JSON file to process', 'string', '__stdin'],
+  output: ['o', 'Output JSON file', 'string', '__stdout'],
+  copyrightSubject: ['c', 'Copyright for generated POT file', 'string', ''],
+  bugsEmail: ['b', 'Email for bugs', 'string', ''],
+  year: ['y', 'Copyright year', 'number', (new Date()).getFullYear()],
+  help: ['h', 'Show some help', 'bool', false]
+});
+
+if (options.help) {
+  console.log(`i18n JSON -> POT converter
+
+Options:
+   -h / --help                Show this help
+   -s / --src FILE            Define input JSON file name. Defaults 
+                              to stdin.
+   -o / --output FILE         Define output POT file name. If a file 
+                              already exists, it's contents will be
+                              overwritten. Defaults to stdout.
+   
+   -c / --copyrightSubject    Team name or author name.
+   -b / --bugsEmail           Email for sending bugs
+   -y / --year                Copyright year, defaults to current year.
+`);
+  process.exit(0);
+}
+
+console.warn('Running conversion for file: ', options.src);
+
+const meta = {
+  copyrightSubject: options.copyrightSubject,
+  bugsEmail: options.bugsEmail,
+  year: options.year,
+};
+
+if (options.src === '__stdin') {
+  cli.withStdin((data) => {
+    try {
+      makeOutput(convert(data, meta), options.output);
+    } catch (e) {
+      console.error(e);
+      process.exit(1);
+    }
+  });
+} else {
+  readFile(options.src, { encoding: 'utf-8' }, (err, data) => {
+    if (err) {
+      console.error(err);
+      process.exit(1);
+    }
+    try {
+      makeOutput(convert(data, meta), options.output);
+    } catch (e) {
+      console.error(e);
+      process.exit(1);
+    }
+  });
+}
+
+function makeOutput(data: string, output: string) {
+  if (output === '__stdout') {
+    console.log(data);
+  } else {
+    writeFile(output, data, (e) => {
+      if (e) {
+        console.error(e);
+        process.exit(1);
+      }
+      process.exit(0); // success
+    });
+  }
+}
diff --git a/package.json b/package.json
index c0f7644..8c1cfa5 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   "dependencies": {
     "@types/cli": "^0.11.19",
     "cli": "^1.0.1",
+    "i18n-proto": "^1.0.1",
     "ts-node": "^3.3.0",
     "typescript": "^2.4.2"
   }
diff --git a/yarn.lock b/yarn.lock
index 54c0535..2af68a5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -93,6 +93,10 @@ has-flag@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-2.0.0.tgz#e8207af1cc7b30d446cc70b734b5e8be18f88d51"
 
+i18n-proto@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/i18n-proto/-/i18n-proto-1.0.1.tgz#0a564b8cc893eee1f46800931561df0b917ccff0"
+
 inflight@^1.0.4:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"