faker-ph

Philippine-specific synthetic PII generator. Produces format-valid Philippine identifiers across every major government and financial issuer: PhilSys PSN/PCN (national ID), TIN (tax), SSS and GSIS (social security), UMID (unified multi-purpose ID), PhilHealth PIN (health insurance), PRC license (professional regulation), LTO driver's license, DFA passport, and Landbank/BPI/BDO account numbers. Also generates Globe/Smart/Sun/DITO mobile numbers, NCR and provincial landline formats, PSGC-backed addresses across 42,036 barangays, origin-stratified Filipino names (Spanish/Tagalog/Chinese/Anglo buckets), and Filipino-style dates. Includes a small pack of document templates (discharge summary, police blotter, affidavit) that render to text with character-offset gold PII spans for NLP evaluation.

See the Acronym reference section if these abbreviations are unfamiliar.

Licensed under Apache-2.0. Bundled reference data is redistributed from public upstream sources; see NOTICE.

Status: v0.1.0 (alpha). API surface is stable for the identifier generators; the template pack will grow (lab report, prescription, referral letter, and additional legal forms are on the roadmap).

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Install

pip install faker-ph

From source:

git clone https://github.com/danielquillanroxas/faker-ph
cd faker-ph
pip install -e ".[dev]"

Quickstart

from faker_ph import FakerPH

f = FakerPH(seed=42)

f.psn()             # '8894-1850-5612-7456'   (16-digit PhilSys Number)
f.tin()             # '123-456-789-000'        (TIN + branch code)
f.philhealth_pin()  # '12-345678901-2'
f.mobile()          # '0917 555 1234'
f.landline('2')     # '(02) 812 3456'
f.full_name(origin='spanish', sex='f')  # 'María Elena Santos-Lim'
f.filipino_date()   # 'Ika-12 ng Hunyo, 1998'
f.address()['full'] # 'Blk 12 Lot 7, Rizal St, Brgy. ..., ...'

All methods are deterministic when seeded. Default seed is 42.

Generating documents with gold PII spans

from faker_ph import FakerPH, DISCHARGE_SUMMARY, render

f = FakerPH(seed=42)
text, spans = render(DISCHARGE_SUMMARY, f, doc_id="example_001")

print(text[:200])
for s in spans[:5]:
    print(f"  {s['type']:<16} {text[s['start']:s['end']]!r}")

Each span is a dict with start, end, type, and value. Character offsets are computed in the post-substitution text, not the template. Templates ship with narrative variants to prevent prompt-memorization when used as evaluation seeds.

See examples/generate_samples.py for a deterministic script that outputs 20 rendered documents with gold spans to examples/rendered_samples.jsonl and examples/gold_spans.jsonl; both files are committed to the repo so you can inspect output without installing anything.

Why Filipino PII is distinct

Off-the-shelf multilingual PII detectors (Presidio, GLiNER-Multi-PII, Azure PII) do not cover Filipino as a first-class language, and a straight translation of English tooling misses several Philippine-specific signals:

• Code-switching (Taglish). Identifiers frequently appear in English formatting (phone numbers, dates, account numbers) inside otherwise-Tagalog prose, and vice versa. PII recognizers trained on monolingual corpora mis-segment at language boundaries.
• PSGC geographic hierarchy. The Philippine Standard Geographic Code (maintained by the Philippine Statistics Authority, PSA) organizes PH addresses in a four-level structure: region > province > city/municipality > barangay. Barangay names alone (42,036 unique, often reused across provinces) are strong quasi-identifiers that generic LOC taggers flatten away.
• Government identifier formats with non-trivial validation.
  • PhilSys PSN (Philippine Identification System Number, issued by the Philippine Statistics Authority): 16 digits, displayed NNNN-NNNN-NNNN-NNNN per PSA Circular 2020-2004. This is the national ID.
  • PhilSys PCN (PhilSys Card Number): 12 digits printed on the physical national-ID card, distinct from the permanent PSN.
  • TIN (Taxpayer Identification Number, issued by the Bureau of Internal Revenue, BIR): 9-digit core + 3-digit branch code, NNN-NNN-NNN-BBB.
  • SSS (Social Security System, private-sector social insurance): 10 digits, NN-NNNNNNN-N where the last digit is an undocumented checksum.
  • GSIS (Government Service Insurance System, for government employees): 11 digits.
  • UMID (Unified Multi-Purpose ID, combines SSS/GSIS/PhilHealth/Pag-IBIG): 12-digit CRN NNNN-NNNNNNN-N.
  • PhilHealth PIN (Philippine Health Insurance Corporation, PH's universal health insurer): 12 digits, NN-NNNNNNNNN-N.
  • PRC license (Professional Regulation Commission, issues licenses for doctors, lawyers, engineers, architects): 7 digits.
  • DFA passport (Department of Foreign Affairs): 2 letters + 7 digits.
• Origin-stratified names. Spanish-origin surnames (Santos, Cruz, Dela Cruz, ~62% of population, a legacy of the 1849 Clavería decree that assigned surnames from a state catalog), native Tagalog surnames (Lakandula, Dimakulangan, Maganda, ~25%), Chinese-origin (Tan, Lim, Sy, ~8%, dating to pre-colonial trade and 19th-century immigration), Anglo-origin (Smith, Johnson, rare). Model fairness across these buckets is measurable and worth auditing.
• Filipino-style dates. Ika-12 ng Hunyo, 1998 coexists with ISO 1998-06-12 and US 06/12/1998 in the same corpus; Tagalog month names (Enero, Pebrero, Marso, etc.) don't appear in any English date parser.
• Honorifics fused with names. Tagalog kinship honorifics (Kuya, Ate, Lolo, Lola, Nanay, Tatay) commonly precede names in social text; formal honorifics (Bb., Gng., Dr., Atty., Engr.) in legal/clinical text. Both fuse orthographically in ways generic tokenizers don't respect.

faker-ph encodes these distinctions at the generator level so that NLP evaluation corpora built on top of it reflect real Philippine linguistic and administrative reality.

What's here / what's coming

Shipping in v0.1.0:

• FakerPH class with 25+ identifier generators, address/name/date/email methods, and a patient_record() convenience builder
• Bundled PSGC reference data (17 regions, 117 provinces, 1,648 municipalities/cities, 42,036 barangays)
• Mobile prefix + landline area code tables (all four carriers, all NCR PTE identifiers, 80+ provincial area codes)
• Origin-stratified Filipino name inventory (Spanish/Tagalog/Chinese/Anglo buckets + honorifics)
• render() utility that substitutes template slots and returns (text, gold_spans)
• Three starter templates: DISCHARGE_SUMMARY, POLICE_BLOTTER, AFFIDAVIT_COMPLAINT
• 20 deterministic example outputs in examples/

Coming in later versions:

• Additional clinical templates: prescription, referral letter, lab report, PhilHealth claim form
• Additional legal templates: contract NDA, notarial acknowledgment, court complaint
• Published checksum algorithms where reverse-engineered (currently format-only for SSS, PhilHealth)
• A trained PII detection model and an evaluation benchmark are forthcoming in a separate companion release. See Citation.

Acronym reference

Philippine government and financial institutions use many acronyms. This section spells out every abbreviation this library encodes, grouped by issuer.

Identity and civil registry

• PhilSys - Philippine Identification System (the national ID program)
• PSN - PhilSys Number (permanent 16-digit lifetime identifier)
• PCN - PhilSys Card Number (12 digits, printed on the physical ID card)
• PSA - Philippine Statistics Authority (issues PSN/PCN, maintains PSGC and civil registry)
• PSGC - Philippine Standard Geographic Code (region/province/city/barangay hierarchy)

Tax and social insurance

• BIR - Bureau of Internal Revenue (issues TINs)
• TIN - Taxpayer Identification Number
• SSS - Social Security System (private-sector contributors)
• GSIS - Government Service Insurance System (government-sector contributors)
• UMID - Unified Multi-Purpose ID (combines SSS/GSIS/PhilHealth/Pag-IBIG on one card)
• PhilHealth - Philippine Health Insurance Corporation (universal health coverage)
• PIN - Personal Identification Number (PhilHealth's member number)

Professional and travel

• PRC - Professional Regulation Commission (licenses doctors, lawyers, engineers, teachers, etc.)
• LTO - Land Transportation Office (issues driver's licenses)
• DFA - Department of Foreign Affairs (issues passports)

Banking and telecom

• BDO - Banco de Oro (largest PH private bank)
• BPI - Bank of the Philippine Islands (oldest PH bank, founded 1851)
• Landbank - Land Bank of the Philippines (state-owned bank)
• NCR - National Capital Region (Metro Manila, 16 cities + 1 municipality, area code 02)
• PTE - Public Telecommunications Entity (the telco operating a given number block: 3=Bayan, 5=Eastern, 6=ABS-CBN, 7=Globe, 8=PLDT for the NCR 8-digit format)

Locations frequently appearing in the sample data

• Brgy. - Barangay (smallest administrative unit in the Philippines, ~42,000 nationwide)
• QC - Quezon City (largest NCR city by population)
• PNP - Philippine National Police (referenced in the police-blotter template)
• DOH - Department of Health
• BPO - Business Process Outsourcing (the $30B PH call-center/back-office industry; relevant to PII workloads)

Caveats

• Not a validation oracle. Do not use generated identifiers to validate real-world documents. Some format specifications are reconstructed from public form layouts and may not match current agency-issued formats exactly.
• Not a complete name inventory. The bundled name lists are for synthetic-generation use (~50 names per origin bucket). They are NOT suitable as ground truth for training a name-recognition model without substantial augmentation.
• PSA data currency. Bundled PSGC CSVs reflect PSA publications current as of 2023. Municipalities are renamed and barangays created/dissolved periodically; refresh from upstream (see NOTICE) for production use.

Citation

@software{roxas2026fakerph,
  author = {Roxas, Daniel Quillan},
  title  = {faker-ph: Philippine-specific synthetic PII generator},
  year   = {2026},
  url    = {https://github.com/danielquillanroxas/faker-ph},
  version = {0.1.0}
}

A companion paper describing a broader Filipino PII evaluation framework is in preparation. This CITATION entry will be updated once published.

Contributing

Issues and PRs welcome. Please run pytest and ruff check . locally before submitting. For large changes (new template categories, checksum algorithm contributions, additional name-origin buckets), open an issue first so we can coordinate scope.

License

• Code: Apache-2.0
• Bundled reference data: redistributed from public upstreams under their original licenses. See NOTICE.