i18n Missing Key Detector
Upload multiple locale files to find missing and untranslated keys — free, no sign-up required
Upload Locale Files
Drag & drop JSON or YAML locale files, or click to select. Max 20 files, 5MB each.
How to Use the Missing Translation Checker
- 1
Upload your translation files
Drag and drop or select your JSON/YAML locale files. Upload at least two files (e.g., en.json and fr.json) to compare translations across languages.
- 2
Select the base language
Choose your primary locale as the reference. The checker compares all other files against it to find missing keys and untranslated strings that still match the base text.
- 3
Export the report
Review the list of missing and untranslated keys per language. Export as CSV for spreadsheets or JSON for automated workflows. Fix the gaps to achieve 100% translation coverage.
Frequently Asked Questions
What does the i18n checker do?
It compares your translation files and detects missing keys, untranslated strings, and inconsistencies across locales.
What file formats are supported?
JSON and YAML locale files. Upload multiple files to compare them side by side.
Can I export the missing key report?
Yes. You can export the report with all missing keys for easy tracking and sharing.