diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..7dc22e2
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,16 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## 1.0.0 (2026-07-22)
+
+### Features
+
+* **bundler-utils:** add shared bundler machinery ([#5](https://github.com/TrigenSoftware/srcset/issues/5)) ([fd072e6](https://github.com/TrigenSoftware/srcset/commit/fd072e6c76b6aef9e5cbdd5a2ce668e145881c03))
+* **cli:** add command line tool ([#2](https://github.com/TrigenSoftware/srcset/issues/2)) ([cc5c841](https://github.com/TrigenSoftware/srcset/commit/cc5c8413f5207e8aca447871518b11ab75b2a4cc))
+* **core:** add image processing engine ([#1](https://github.com/TrigenSoftware/srcset/issues/1)) ([7ddce44](https://github.com/TrigenSoftware/srcset/commit/7ddce44f981a25f71a473f26b0a7471e957944f4))
+* **loader:** add webpack and Rspack loader ([#6](https://github.com/TrigenSoftware/srcset/issues/6)) ([79a0a82](https://github.com/TrigenSoftware/srcset/commit/79a0a8215162be9ce134754e5486366c23efd9fd))
+* rules apply first match by default with fallthrough opt-in ([a044cb2](https://github.com/TrigenSoftware/srcset/commit/a044cb24fa181f5da595498fe8b0671444f6e546))
+* **runtime:** add browser runtime helpers ([#4](https://github.com/TrigenSoftware/srcset/issues/4)) ([9366144](https://github.com/TrigenSoftware/srcset/commit/9366144e1ca5f5287c7ffdbf443c71afe751881b))
+* **vite-plugin:** add Vite plugin ([#7](https://github.com/TrigenSoftware/srcset/issues/7)) ([be02c44](https://github.com/TrigenSoftware/srcset/commit/be02c44976c954d1e1511306e5b186b4a4aa1471))
diff --git a/packages/bundler-utils/CHANGELOG.md b/packages/bundler-utils/CHANGELOG.md
new file mode 100644
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+++ b/packages/bundler-utils/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## 1.0.0 (2026-07-22)
+
+### Features
+
+* add shared bundler machinery ([#5](https://github.com/TrigenSoftware/srcset/issues/5)) ([fd072e6](https://github.com/TrigenSoftware/srcset/commit/fd072e6c76b6aef9e5cbdd5a2ce668e145881c03))
+* rules apply first match by default with fallthrough opt-in ([a044cb2](https://github.com/TrigenSoftware/srcset/commit/a044cb24fa181f5da595498fe8b0671444f6e546))
diff --git a/packages/cli/CHANGELOG.md b/packages/cli/CHANGELOG.md
new file mode 100644
index 0000000..c65e338
--- /dev/null
+++ b/packages/cli/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## 1.0.0 (2026-07-22)
+
+### Features
+
+* add command line tool ([#2](https://github.com/TrigenSoftware/srcset/issues/2)) ([cc5c841](https://github.com/TrigenSoftware/srcset/commit/cc5c8413f5207e8aca447871518b11ab75b2a4cc))
+* rules apply first match by default with fallthrough opt-in ([a044cb2](https://github.com/TrigenSoftware/srcset/commit/a044cb24fa181f5da595498fe8b0671444f6e546))
diff --git a/packages/core/CHANGELOG.md b/packages/core/CHANGELOG.md
new file mode 100644
index 0000000..49fadd8
--- /dev/null
+++ b/packages/core/CHANGELOG.md
@@ -0,0 +1,10 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## 1.0.0 (2026-07-22)
+
+### Features
+
+* add image processing engine ([#1](https://github.com/TrigenSoftware/srcset/issues/1)) ([7ddce44](https://github.com/TrigenSoftware/srcset/commit/7ddce44f981a25f71a473f26b0a7471e957944f4))
diff --git a/packages/loader/CHANGELOG.md b/packages/loader/CHANGELOG.md
new file mode 100644
index 0000000..14a5622
--- /dev/null
+++ b/packages/loader/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## 1.0.0 (2026-07-22)
+
+### Features
+
+* add webpack and Rspack loader ([#6](https://github.com/TrigenSoftware/srcset/issues/6)) ([79a0a82](https://github.com/TrigenSoftware/srcset/commit/79a0a8215162be9ce134754e5486366c23efd9fd))
+* rules apply first match by default with fallthrough opt-in ([a044cb2](https://github.com/TrigenSoftware/srcset/commit/a044cb24fa181f5da595498fe8b0671444f6e546))
diff --git a/packages/runtime/CHANGELOG.md b/packages/runtime/CHANGELOG.md
new file mode 100644
index 0000000..1834cc2
--- /dev/null
+++ b/packages/runtime/CHANGELOG.md
@@ -0,0 +1,10 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## 1.0.0 (2026-07-22)
+
+### Features
+
+* add browser runtime helpers ([#4](https://github.com/TrigenSoftware/srcset/issues/4)) ([9366144](https://github.com/TrigenSoftware/srcset/commit/9366144e1ca5f5287c7ffdbf443c71afe751881b))
diff --git a/packages/vite-plugin/CHANGELOG.md b/packages/vite-plugin/CHANGELOG.md
new file mode 100644
index 0000000..1642a20
--- /dev/null
+++ b/packages/vite-plugin/CHANGELOG.md
@@ -0,0 +1,10 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## 1.0.0 (2026-07-22)
+
+### Features
+
+* add Vite plugin ([#7](https://github.com/TrigenSoftware/srcset/issues/7)) ([be02c44](https://github.com/TrigenSoftware/srcset/commit/be02c44976c954d1e1511306e5b186b4a4aa1471))