# HaveIBeenPwned/PwnedPasswordsDownloader

A tool to download all Pwned Passwords hash ranges and save them offline so they can be used without a dependency on the k-anonymity API

Repository: https://github.com/HaveIBeenPwned/PwnedPasswordsDownloader
Canonical: https://ross.abutalabs.com/products/pwnedpasswordsdownloader
Language: C#
License: BSD-3-Clause
License Family: permissive
Last push: 2026-08-19T12:56:36+00:00

## Health v2 (maintenance only)
Score: 76/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 35, longevity 100
- inputs: {"age_days": 1577, "days_push": 14, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1289, forks 147 (observed 2026-08-28T04:04:15.250378+00:00)

## What it is
A .NET global tool that downloads the complete Pwned Passwords SHA1 and NTLM hash ranges for offline use, removing the need to query the k-anonymity API at runtime. It supports single-file or per-range directory output, MD5 content verification, retries, and incremental updates via ETag-based indexes.

## Use cases
- download all pwned passwords hashes for offline use
- mirror the have i been pwned password corpus locally
- run password breach checks without calling the k-anonymity API
- download NTLM hash ranges instead of SHA1
- incrementally update a local pwned passwords dataset
- self-host password breach checking for my service

## When to choose
- you need to validate passwords offline or at high volume without API rate limits
- you want to self-host a pwned password lookup service
- you need NTLM as well as SHA1 hash data

## When to avoid
- you only check occasional passwords and the free k-anonymity API is sufficient
- you cannot spare several gigabytes of local storage for the hash ranges

## Facets
- artifact type: cli-tool
- maturity: active
- function: cli, security, http-client, file-system
- domain: security, privacy, developer-tools
- platform: windows, cross-platform, cli, dotnet
- tags: haveibeenpwned, pwned-passwords, password-hashes, offline-dataset, sha1, ntlm, k-anonymity, data-download, passwords, command-line, linux, macos

## Member repositories
- HaveIBeenPwned/PwnedPasswordsDownloader (main) score 76

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:15.250378+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:55:41.877027+00:00, confidence not recorded.
  - readme: https://github.com/HaveIBeenPwned/PwnedPasswordsDownloader (fetched 2026-08-28T04:04:15.250378+00:00, sha 7617d88bc400)
- Data as of 2026-08-30T08:39:29.467469+00:00.