diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
deleted file mode 100644
index 1954918..0000000
--- a/.github/CONTRIBUTING.md
+++ /dev/null
@@ -1,21 +0,0 @@
-# Contributing
-
-## Linting
-
-Linting is run on the CI using [prek](https://prek.j178.dev//), and can be run locally:
-
-```sh
-pip install prek
-prek install  # optional: to run when you commit, on just the staged changes
-prek run --all-files  # to run on all files now
-```
-
-## Docstrings
-
-Follow
-[Google style](https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings)
-for docstrings.
-
-## Localization
-
-See [README](https://github.com/python-humanize/humanize#localization).
diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
deleted file mode 100644
index aa4bcd7..0000000
--- a/.github/FUNDING.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-github: hugovk
-tidelift: "pypi/humanize"
diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
deleted file mode 100644
index 2396030..0000000
--- a/.github/ISSUE_TEMPLATE.md
+++ /dev/null
@@ -1,22 +0,0 @@
-### What did you do?
-
-### What did you expect to happen?
-
-### What actually happened?
-
-### What versions are you using?
-
-* OS: 
-* Python: 
-* Humanize: 
-
-Please include **code** that reproduces the issue.
-
-The [best reproductions](https://stackoverflow.com/help/minimal-reproducible-example)
-are
-[self-contained scripts](https://ericlippert.com/2014/03/05/how-to-debug-small-programs/)
-with minimal dependencies.
-
-```python
-code goes here
-```
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
deleted file mode 100644
index 7fa46ec..0000000
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ /dev/null
@@ -1,7 +0,0 @@
-Fixes #
-
-Changes proposed in this pull request:
-
-* 
-* 
-* 
diff --git a/.github/SECURITY.md b/.github/SECURITY.md
deleted file mode 100644
index 74487a6..0000000
--- a/.github/SECURITY.md
+++ /dev/null
@@ -1,4 +0,0 @@
-# Security policy
-
-Security reports can be made via [Tidelift](https://tidelift.com/security). Tidelift
-will coordinate the fix and disclosure.
diff --git a/.github/labels.yml b/.github/labels.yml
deleted file mode 100644
index 7534b02..0000000
--- a/.github/labels.yml
+++ /dev/null
@@ -1,74 +0,0 @@
-# Default GitHub labels
-- color: d73a4a
-  description: "Something isn't working"
-  name: bug
-- color: cfd3d7
-  description: "This issue or pull request already exists"
-  name: duplicate
-- color: a2eeef
-  description: "New feature or request"
-  name: enhancement
-- color: 7057ff
-  description: "Good for newcomers"
-  name: good first issue
-- color: 008672
-  description: "Extra attention is needed"
-  name: help wanted
-- color: e4e669
-  description: "This doesn't seem right"
-  name: invalid
-- color: d876e3
-  description: "Further information is requested"
-  name: question
-- color: ffffff
-  description: "This will not be worked on"
-  name: wontfix
-
-# Keep a Changelog labels
-# https://keepachangelog.com/en/1.0.0/
-- color: 0e8a16
-  description: "For new features"
-  name: "changelog: Added"
-- color: af99e5
-  description: "For changes in existing functionality"
-  name: "changelog: Changed"
-- color: FFA500
-  description: "For soon-to-be removed features"
-  name: "changelog: Deprecated"
-- color: 00A800
-  description: "For any bug fixes"
-  name: "changelog: Fixed"
-- color: ff0000
-  description: "For now removed features"
-  name: "changelog: Removed"
-- color: 045aa0
-  description: "In case of vulnerabilities"
-  name: "changelog: Security"
-- color: fbca04
-  description: "Exclude PR from release draft"
-  name: "changelog: skip"
-
-# Other labels
-- color: 0366d6
-  description: "For dependencies"
-  name: dependencies
-- color: 0075ca
-  description: "Improvements or additions to documentation"
-  name: documentation
-- color: d0c1ff
-  description: "Translations need updating"
-  name: "needs localisation"
-- color: eb6123
-  description: ""
-  name: Hacktoberfest
-- color: eb6123
-  description: "To credit accepted Hacktoberfest PRs"
-  name: hacktoberfest-accepted
-- color: e29673
-  name: "needs tests"
-- color: d65e88
-  description: "Deploy and release"
-  name: release
-- color: fbca04
-  description: "Unit tests, linting, CI, etc."
-  name: testing
diff --git a/.github/release-drafter.yml b/.github/release-drafter.yml
deleted file mode 100644
index ba26220..0000000
--- a/.github/release-drafter.yml
+++ /dev/null
@@ -1,48 +0,0 @@
-name-template: "$RESOLVED_VERSION"
-tag-template: "$RESOLVED_VERSION"
-
-categories:
-  - title: "Added"
-    labels:
-      - "changelog: Added"
-      - "enhancement"
-  - title: "Changed"
-    label: "changelog: Changed"
-  - title: "Deprecated"
-    label: "changelog: Deprecated"
-  - title: "Removed"
-    label: "changelog: Removed"
-  - title: "Fixed"
-    labels:
-      - "changelog: Fixed"
-      - "bug"
-  - title: "Security"
-    label: "changelog: Security"
-
-exclude-labels:
-  - "changelog: skip"
-
-autolabeler:
-  - label: "changelog: skip"
-    branch:
-      - "/pre-commit-ci-update-config/"
-
-template: |
-  $CHANGES
-
-version-resolver:
-  major:
-    labels:
-      - "changelog: Removed"
-  minor:
-    labels:
-      - "changelog: Added"
-      - "changelog: Changed"
-      - "changelog: Deprecated"
-      - "enhancement"
-
-  patch:
-    labels:
-      - "changelog: Fixed"
-      - "bug"
-  default: minor
diff --git a/.github/renovate.json b/.github/renovate.json
deleted file mode 100644
index 14778ed..0000000
--- a/.github/renovate.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": ["config:recommended", ":semanticCommitsDisabled"],
-  "labels": ["changelog: skip", "dependencies"],
-  "minimumReleaseAge": "7 days",
-  "packageRules": [
-    {
-      "groupName": "github-actions",
-      "matchManagers": ["github-actions"],
-      "separateMajorMinor": false
-    },
-    {
-      "groupName": "docs/requirements.txt",
-      "matchFileNames": ["docs/requirements.txt"],
-      "separateMajorMinor": false
-    }
-  ],
-  "schedule": ["on the first day of the month"]
-}
diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
deleted file mode 100644
index face743..0000000
--- a/.github/workflows/benchmark.yml
+++ /dev/null
@@ -1,40 +0,0 @@
-name: Benchmark
-
-on: [push, pull_request, workflow_dispatch]
-
-permissions: {}
-
-env:
-  FORCE_COLOR: 1
-  PIP_DISABLE_PIP_VERSION_CHECK: 1
-
-jobs:
-  benchmarks:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-
-      - name: Set up Python 3.14
-        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
-        with:
-          python-version: "3.14"
-          allow-prereleases: true
-
-      - name: Install gettext
-        run: |
-          sudo apt install gettext
-
-      - name: Generate translation binaries
-        run: |
-          scripts/generate-translation-binaries.sh
-
-      - name: Install dependencies
-        run: pip install -e ".[tests]"
-
-      - name: Run benchmarks
-        uses: CodSpeedHQ/action@a4a36bb07c0638b0b4ca52bf1f3dad1b4289e52f # v4.18.1
-        with:
-          mode: simulation
-          run: pytest tests/test_benchmarks.py --codspeed
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
deleted file mode 100644
index 60b86e1..0000000
--- a/.github/workflows/docs.yml
+++ /dev/null
@@ -1,29 +0,0 @@
-name: Docs
-
-on: [push, pull_request, workflow_dispatch]
-
-permissions: {}
-
-env:
-  FORCE_COLOR: 1
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-
-      - name: Set up Python
-        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
-        with:
-          python-version: "3.x"
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
-
-      - name: Docs
-        run: |
-          uvx --with tox-uv tox -e docs
diff --git a/.github/workflows/labels.yml b/.github/workflows/labels.yml
deleted file mode 100644
index f81156d..0000000
--- a/.github/workflows/labels.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: Sync labels
-
-on:
-  push:
-    branches:
-      - main
-    paths:
-      - .github/labels.yml
-  workflow_dispatch:
-
-jobs:
-  sync:
-    permissions:
-      pull-requests: write
-    runs-on: ubuntu-slim
-    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-      - uses: micnncim/action-label-syncer@3abd5ab72fda571e69fffd97bd4e0033dd5f495c # v1.3.0
-        with:
-          prune: false
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
deleted file mode 100644
index 36aed10..0000000
--- a/.github/workflows/lint.yml
+++ /dev/null
@@ -1,34 +0,0 @@
-name: Lint
-
-on: [push, pull_request, workflow_dispatch]
-
-permissions: {}
-
-env:
-  FORCE_COLOR: 1
-  RUFF_OUTPUT_FORMAT: github
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-      - uses: j178/prek-action@bdca6f102f98e2b4c7029491a53dfd366469e33d # v2.0.4
-
-  mypy:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
-        with:
-          python-version: "3.x"
-      - name: Install uv
-        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
-      - name: Mypy
-        run: uvx --with tox-uv tox -e mypy
diff --git a/.github/workflows/release-drafter.yml b/.github/workflows/release-drafter.yml
deleted file mode 100644
index 4929270..0000000
--- a/.github/workflows/release-drafter.yml
+++ /dev/null
@@ -1,39 +0,0 @@
-name: Release drafter
-
-on:
-  push:
-    # branches to consider in the event; optional, defaults to all
-    branches:
-      - main
-  # pull_request event is required only for autolabeler
-  pull_request:
-    # Only following types are handled by the action, but one can default to all as well
-    types: [opened, reopened, synchronize]
-  # pull_request_target event is required for autolabeler to support PRs from forks
-  # pull_request_target:
-  #   types: [opened, reopened, synchronize]
-  workflow_dispatch:
-
-jobs:
-  update_release_draft:
-    if: |
-      github.event.repository.fork == false
-      && github.event_name != 'pull_request'
-    permissions:
-      # write permission is required to create a GitHub Release
-      contents: write
-    runs-on: ubuntu-slim
-    steps:
-      # Drafts your next release notes as pull requests are merged into "main"
-      - uses: release-drafter/release-drafter@ed4bc48ec97379be2258e7b7ac2624a3e26ab809 # v7.4.0
-
-  autolabeler:
-    if: |
-      github.event.repository.fork == false
-      && github.event_name == 'pull_request'
-    permissions:
-      # write permission is required for autolabeler
-      pull-requests: write
-    runs-on: ubuntu-slim
-    steps:
-      - uses: release-drafter/release-drafter/autolabeler@ed4bc48ec97379be2258e7b7ac2624a3e26ab809 # v7.4.0
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
deleted file mode 100644
index 4d7a4e5..0000000
--- a/.github/workflows/release.yml
+++ /dev/null
@@ -1,86 +0,0 @@
-name: Release
-
-on:
-  push:
-    branches: [main]
-    tags: ["*"]
-  pull_request:
-    branches: [main]
-  release:
-    types:
-      - published
-  workflow_dispatch:
-
-permissions: {}
-
-env:
-  FORCE_COLOR: 1
-
-jobs:
-  # Always build & lint package.
-  build-package:
-    name: Build & verify package
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          fetch-depth: 0
-          persist-credentials: false
-
-      - name: Install gettext
-        run: |
-          sudo apt install gettext
-
-      - name: Generate translation binaries
-        run: |
-          scripts/generate-translation-binaries.sh
-
-      - uses: hynek/build-and-inspect-python-package@d44ca7d91762de7a7d5436ddae667c6da6d1c3df # v2.18.0
-
-  # Upload to Test PyPI on every commit on main.
-  release-test-pypi:
-    name: Publish in-dev package to test.pypi.org
-    if: |
-      github.event.repository.fork == false
-      && github.event_name == 'push'
-      && github.ref == 'refs/heads/main'
-    runs-on: ubuntu-latest
-    needs: build-package
-
-    permissions:
-      id-token: write
-
-    steps:
-      - name: Download packages built by build-and-inspect-python-package
-        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
-        with:
-          name: Packages
-          path: dist
-
-      - name: Upload package to Test PyPI
-        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # v1.14.0
-        with:
-          repository-url: https://test.pypi.org/legacy/
-
-  # Upload to real PyPI on GitHub Releases.
-  release-pypi:
-    name: Publish released package to pypi.org
-    if: |
-      github.event.repository.fork == false
-      && github.event.action == 'published'
-    runs-on: ubuntu-latest
-    needs: build-package
-
-    permissions:
-      id-token: write
-
-    steps:
-      - name: Download packages built by build-and-inspect-python-package
-        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
-        with:
-          name: Packages
-          path: dist
-
-      - name: Upload package to PyPI
-        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # v1.14.0
diff --git a/.github/workflows/require-pr-label.yml b/.github/workflows/require-pr-label.yml
deleted file mode 100644
index 47bf92b..0000000
--- a/.github/workflows/require-pr-label.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-name: Require PR label
-
-on:
-  pull_request:
-    types: [opened, reopened, labeled, unlabeled, synchronize]
-
-jobs:
-  label:
-    runs-on: ubuntu-slim
-
-    permissions:
-      issues: write
-      pull-requests: write
-
-    steps:
-      - uses: mheap/github-action-required-labels@0ac283b4e65c1fb28ce6079dea5546ceca98ccbe # v5.5.2
-        with:
-          mode: minimum
-          count: 1
-          labels: |
-            changelog: Added
-            changelog: Changed
-            changelog: Deprecated
-            changelog: Fixed
-            changelog: Removed
-            changelog: Security
-            changelog: skip
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
deleted file mode 100644
index 6cb6e61..0000000
--- a/.github/workflows/test.yml
+++ /dev/null
@@ -1,78 +0,0 @@
-name: Test
-
-on: [push, pull_request, workflow_dispatch]
-
-permissions: {}
-
-env:
-  FORCE_COLOR: 1
-  PIP_DISABLE_PIP_VERSION_CHECK: 1
-
-jobs:
-  test:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version:
-          - "pypy3.11"
-          - "3.15t"
-          - "3.15"
-          - "3.14t"
-          - "3.14"
-          - "3.13"
-          - "3.12"
-          - "3.11"
-          - "3.10"
-        os: [windows-latest, macos-latest, ubuntu-latest]
-
-    steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
-        with:
-          python-version: ${{ matrix.python-version }}
-          allow-prereleases: true
-
-      - name: Set PYTHON_GIL
-        if: endsWith(matrix.python-version, 't')
-        run: |
-          echo "PYTHON_GIL=0" >> "$GITHUB_ENV"
-
-      - name: Install Linux dependencies
-        if: startsWith(matrix.os, 'ubuntu')
-        run: |
-          sudo apt install gettext
-
-      - name: Install macOS dependencies
-        if: startsWith(matrix.os, 'macos')
-        run: |
-          brew install gettext
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # v8.2.0
-
-      - name: Generate translation binaries
-        run: |
-          scripts/generate-translation-binaries.sh
-
-      - name: Tox tests
-        run: |
-          uvx --python ${{ matrix.python-version }} --with tox-uv tox -e py
-
-      - name: Upload coverage
-        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
-        with:
-          flags: ${{ matrix.os }}
-          name: ${{ matrix.os }} Python ${{ matrix.python-version }}
-
-  success:
-    needs: test
-    runs-on: ubuntu-latest
-    name: Test successful
-    steps:
-      - name: Success
-        run: echo Test successful
diff --git a/src/humanize/filesize.py b/src/humanize/filesize.py
index fb675fd..bdd395a 100644
--- a/src/humanize/filesize.py
+++ b/src/humanize/filesize.py
@@ -4,6 +4,7 @@
 
 __lazy_modules__ = {"humanize.i18n", "math"}
 
+import math
 from math import log
 
 from humanize.i18n import _gettext as _
@@ -67,6 +68,16 @@ def naturalsize(
         '30000.0 QB'
         >>> naturalsize(-4096, True)
         '-4.0 KiB'
+        >>> naturalsize(0)
+        '0 Bytes'
+        >>> naturalsize(float('nan'))
+        Traceback (most recent call last):
+            ...
+        ValueError: naturalsize() requires a finite number of bytes, got nan
+        >>> naturalsize(float('inf'))
+        Traceback (most recent call last):
+            ...
+        ValueError: naturalsize() requires a finite number of bytes, got inf
 
         ```
 
@@ -90,6 +101,17 @@ def naturalsize(
 
     base = 1024 if (gnu or binary) else 1000
     bytes_ = float(value)
+    # Reject NaN and infinities up front. A NaN would propagate into log()/abs() and
+    # later raise a confusing "cannot convert float NaN to integer" from int() on
+    # the suffix exponent; +inf/-inf would silently render as "inf QB" / "-inf QB",
+    # which is not a meaningful filesize for any real caller. math.isfinite() also
+    # rejects strings, so non-numeric values reach the float() call below and raise
+    # ValueError as before.
+
+    if not math.isfinite(bytes_):
+        raise ValueError(
+            f"naturalsize() requires a finite number of bytes, got {value!r}"
+        )
     abs_bytes = abs(bytes_)
 
     if abs_bytes == 1 and not gnu:
diff --git a/tests/test_filesize.py b/tests/test_filesize.py
index e695639..028acd5 100644
--- a/tests/test_filesize.py
+++ b/tests/test_filesize.py
@@ -103,3 +103,20 @@ def test_naturalsize(test_args: list[int] | list[int | bool], expected: str) ->
         test_args[0] = f"-{test_args[0]}"
 
     assert humanize.naturalsize(*test_args) == "-" + expected
+
+
+@pytest.mark.parametrize("value", [float("nan"), float("inf"), float("-inf")])
+def test_naturalsize_rejects_non_finite(value: float) -> None:
+    # Non-finite inputs used to surface a confusing low-level error
+    # ("cannot convert float NaN to integer" from int(), or the literal string
+    # "inf QB" for +/-inf) rather than a clear rejection at the call site.
+    with pytest.raises(ValueError, match="finite number of bytes"):
+        humanize.naturalsize(value)
+
+
+@pytest.mark.parametrize("value", ["nan", "inf", "-inf", "NaN", "INF"])
+def test_naturalsize_rejects_non_finite_strings(value: str) -> None:
+    # The same finite-check must trigger for string inputs that float() accepts
+    # but that don't represent a meaningful byte count.
+    with pytest.raises(ValueError, match="finite number of bytes"):
+        humanize.naturalsize(value)