Check the format, check digit and encoded birth date of a Bulgarian EGN number - entirely locally in your browser, no upload.
Running locally on your device ...
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
EGN stands for Edinen grazhdanski nomer ("uniform civil number") and has served as Bulgaria's ten-digit identifier for every person registered in the country since the 1970s. Unlike many Western European social-insurance numbers, the digits themselves already reveal quite a bit: the birth year, month and day sit in the first six positions, with an add-on to the month value signalling whether someone was born in the 19th, 20th or 21st century. The following three positions place the number within a region and simply count upward; whether the last of them is even or odd decides male or female. Right at the end sits a tenth digit, worked out from the first nine through a fixed weighting scheme, that catches typos.
On paste, the tool automatically handles any spaces or dashes in the number. Within seconds you get either a green confirmation with the extracted birth date and sex, or a clear error explaining why it does not fit: too short or too long, a calendar day that simply does not exist, or a final digit that does not match the computed one.
Nothing you type ever leaves your computer or phone: the whole calculation happens right in the browser, with no server call, no intermediate storage and not a single piece of foreign code loaded from the network.
| Input formats | Text input |
|---|---|
| Output format | TXT |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: This tool performs only a mathematical checksum/format check. It is not an official identity, existence, or registry verification and not a request to any authority. Any additional information derived from the number's structure is based solely on the publicly documented encoding logic of the issuing authority. The region historically co-encoded in the digit block 7-9 is deliberately not evaluated by this tool.
No. The check runs entirely locally in your browser; the number never leaves your device and is not stored.
No. It only checks whether the structure and check digit are mathematically correct - no query against a Bulgarian registry or authority.
It is decoded purely by calculation from the first 6 digits of the EGN - the publicly known encoding logic, not from a registry lookup.
The tool names the reason: wrong length, a non-existent date, or a wrong check digit - never a made-up "valid".
Yes. After the first load, the check works entirely without an internet connection.
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