Stranger6667 · Stranger6667 · Oct 22, 2025 · Oct 17, 2025 · Oct 17, 2025 · Oct 17, 2025
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -107,6 +107,9 @@ jobs:
       - run: cargo fmt --all -- --check
         working-directory: ./bindings/c
 
+      - run: cargo fmt --all -- --check
+        working-directory: ./bindings/java
+
       - run: cargo fmt --all -- --check
         working-directory: ./bindings/javascript
 
@@ -148,6 +151,10 @@ jobs:
         run: cargo clippy -- -D warnings
         working-directory: ./bindings/python
 
+      - name: Java
+        run: cargo clippy -- -D warnings
+        working-directory: ./bindings/java
+
       - name: JavaScript
         run: cargo clippy -- -D warnings
         working-directory: ./bindings/javascript

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 ## [Unreleased]
 
+### Added
+
+- `minify_css` option [#12](https://github.com/Stranger6667/css-inline/issues/12)
+
+### Changed
+
+- Bump MSRV to `1.80`
+
 ## [0.17.0] - 2025-07-26
 
 ### Added

diff --git a/README.md b/README.md
@@ -127,6 +127,7 @@ fn main() -> css_inline::Result<()> {
 - `keep_style_tags`. Specifies whether to keep "style" tags after inlining. Default: `false`
 - `keep_link_tags`. Specifies whether to keep "link" tags after inlining. Default: `false`
 - `keep_at_rules`. Specifies whether to keep "at-rules" (starting with `@`) after inlining. Default: `false`
+- `minify_css`. Specifies whether to remove trailing semicolons and spaces between properties and values. Default: `false`
 - `base_url`. The base URL used to resolve relative URLs. If you'd like to load stylesheets from your filesystem, use the `file://` scheme. Default: `None`
 - `load_remote_stylesheets`. Specifies whether remote stylesheets should be loaded. Default: `true`
 - `cache`. Specifies cache for external stylesheets. Default: `None`
@@ -186,6 +187,19 @@ Such tags will be kept in the resulting HTML even if the `keep_style_tags` optio
 </body>
 ```
 
+If you set the the `minify_css` option to `true`, the inlined styles will be minified by removing trailing semicolons
+and spaces between properties and values.
+
+```html
+<head>
+  <!-- With minify_css=true, the <h1> will have `style="color:blue;font-weight:bold"` -->
+  <style>h1 { color: blue; font-weight: bold; }</style>
+</head>
+<body>
+  <h1>Big Text</h1>
+</body>
+```
+
 If you'd like to load stylesheets from your filesystem, use the `file://` scheme:
 
 ```rust

diff --git a/bindings/c/CHANGELOG.md b/bindings/c/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- `minify_css` option [#12](https://github.com/Stranger6667/css-inline/issues/12)
+
 ## [0.17.0] - 2025-07-26
 
 ### Added

diff --git a/bindings/c/README.md b/bindings/c/README.md
@@ -154,6 +154,7 @@ Possible configurations:
 - `keep_style_tags`. Specifies whether to keep "style" tags after inlining. Default: `false`
 - `keep_link_tags`. Specifies whether to keep "link" tags after inlining. Default: `false`
 - `keep_at_rules`. Specifies whether to keep "at-rules" (starting with `@`) after inlining. Default: `false`
+- `minify_css`. Specifies whether to remove trailing semicolons and spaces between properties and values.
 - `base_url`. The base URL used to resolve relative URLs. If you'd like to load stylesheets from your filesystem, use the `file://` scheme. Default: `NULL`
 - `load_remote_stylesheets`. Specifies whether remote stylesheets should be loaded. Default: `true`
 - `cache`. Specifies caching options for external stylesheets. Default: `NULL`
@@ -215,6 +216,19 @@ Such tags will be kept in the resulting HTML even if the `keep_style_tags` optio
 </body>
 ```
 
+If you set the the `minify_css` option to `true`, the inlined styles will be minified by removing trailing semicolons
+and spaces between properties and values.
+
+```html
+<head>
+  <!-- With minify_css=true, the <h1> will have `style="color:blue;font-weight:bold"` -->
+  <style>h1 { color: blue; font-weight: bold; }</style>
+</head>
+<body>
+  <h1>Big Text</h1>
+</body>
+```
+
 You can also cache external stylesheets to avoid excessive network requests:
 
 ```c

diff --git a/bindings/c/src/lib.rs b/bindings/c/src/lib.rs
@@ -95,6 +95,8 @@ pub struct CssInlinerOptions {
     /// Pre-allocate capacity for HTML nodes during parsing.
     /// It can improve performance when you have an estimate of the number of nodes in your HTML document.
     pub preallocate_node_capacity: size_t,
+    /// Remove trailing semicolons and spaces between properties and values.
+    pub minify_css: bool,
 }
 
 macro_rules! inliner {
@@ -186,6 +188,7 @@ pub extern "C" fn css_inliner_default_options() -> CssInlinerOptions {
         keep_style_tags: false,
         keep_link_tags: false,
         keep_at_rules: false,
+        minify_css: false,
         base_url: ptr::null(),
         load_remote_stylesheets: true,
         cache: std::ptr::null(),
@@ -229,6 +232,7 @@ impl TryFrom<&CssInlinerOptions> for InlineOptions<'_> {
             keep_style_tags: value.keep_style_tags,
             keep_link_tags: value.keep_link_tags,
             keep_at_rules: value.keep_at_rules,
+            minify_css: value.minify_css,
             base_url: match base_url {
                 Some(url) => Some(Url::parse(url).map_err(|_| InlineOptionsError::InvalidUrl)?),
                 None => None,

diff --git a/bindings/java/CHANGELOG.md b/bindings/java/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- `minify_css` option [#12](https://github.com/Stranger6667/css-inline/issues/12)
+
 ## [0.17.0] - 2025-07-26
 
 ### Added

diff --git a/bindings/java/README.md b/bindings/java/README.md
@@ -146,7 +146,8 @@ public class ConfigExample {
 - **`setInlineStyleTags(boolean)`** - Inline CSS from `<style>` tags (default: `true`)
 - **`setKeepStyleTags(boolean)`** - Keep `<style>` tags after inlining (default: `false`)
 - **`setKeepLinkTags(boolean)`** - Keep `<link>` tags after inlining (default: `false`)
-- **`setKeepAtRules(boolean`** - Keep `at-rules` (starting with `@`) after inlining (default: `false`)
+- **`setKeepAtRules(boolean)`** - Keep `at-rules` (starting with `@`) after inlining (default: `false`)
+- **`setMinifyCss(boolean)`** - Remove trailing semicolons and spaces between properties and values (default: `false`)
 - **`setBaseUrl(String)`** - Base URL for resolving relative URLs (default: `null`)
 - **`setLoadRemoteStylesheets(boolean)`** - Load external stylesheets (default: `true`)
 - **`setExtraCss(String)`** - Additional CSS to inline (default: `null`)
@@ -244,6 +245,19 @@ Such tags will be kept in the resulting HTML even if the `keep_style_tags` optio
 </body>
 ```
 
+If you set the the `minify_css` option to `true`, the inlined styles will be minified by removing trailing semicolons
+and spaces between properties and values.
+
+```html
+<head>
+  <!-- With minify_css=true, the <h1> will have `style="color:blue;font-weight:bold"` -->
+  <style>h1 { color: blue; font-weight: bold; }</style>
+</head>
+<body>
+  <h1>Big Text</h1>
+</body>
+```
+
 ## Performance
 
 `css-inline` is powered by efficient tooling from Mozilla's Servo project to provide high-performance CSS inlining for Java applications.

diff --git a/bindings/java/build.gradle b/bindings/java/build.gradle
@@ -18,6 +18,7 @@ repositories {
 
 dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter:5.10.0'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 
     jmh 'org.openjdk.jmh:jmh-core:1.37'
     jmh 'org.openjdk.jmh:jmh-generator-annprocess:1.37'

diff --git a/bindings/java/src/main/java/org/cssinline/CssInlineConfig.java b/bindings/java/src/main/java/org/cssinline/CssInlineConfig.java
@@ -14,6 +14,9 @@ public class CssInlineConfig {
 	/** Keep "at-rules" after inlining. */
 	public final boolean keepAtRules;
 
+	/** Remove trailing semicolons and spaces between properties and values. */
+	public final boolean minifyCss;
+
 	/** Whether remote stylesheets should be loaded or not. */
 	public final boolean loadRemoteStylesheets;
 
@@ -30,12 +33,13 @@ public class CssInlineConfig {
 	public final int preallocateNodeCapacity;
 
 	private CssInlineConfig(boolean inlineStyleTags, boolean keepStyleTags, boolean keepLinkTags,
-			boolean keepAtRules, boolean loadRemoteStylesheets, String baseUrl, String extraCss, int cacheSize,
-			int preallocateNodeCapacity) {
+			boolean keepAtRules, boolean minifyCss, boolean loadRemoteStylesheets, String baseUrl, String extraCss,
+			int cacheSize, int preallocateNodeCapacity) {
 		this.inlineStyleTags = inlineStyleTags;
 		this.keepStyleTags = keepStyleTags;
 		this.keepLinkTags = keepLinkTags;
 		this.keepAtRules = keepAtRules;
+		this.minifyCss = minifyCss;
 		this.loadRemoteStylesheets = loadRemoteStylesheets;
 		this.baseUrl = baseUrl;
 		this.extraCss = extraCss;
@@ -51,6 +55,7 @@ public static class Builder {
 		private boolean keepStyleTags = false;
 		private boolean keepLinkTags = false;
 		private boolean keepAtRules = false;
+		private boolean minifyCss = false;
 		private boolean loadRemoteStylesheets = true;
 		private String baseUrl = null;
 		private String extraCss = null;
@@ -110,6 +115,17 @@ public Builder setKeepAtRules(boolean b) {
 			return this;
 		}
 
+		/**
+		 * Remove trailing semicolons and spaces between properties and values.
+		 *
+		 * @param b true to remove, false to keep them
+		 * @return this builder instance for method chaining
+		 */
+		public Builder setMinifyCss(boolean b) {
+			this.minifyCss = b;
+			return this;
+		}
+
 		/**
 		 * Whether remote stylesheets should be loaded or not.
 		 *
@@ -148,7 +164,7 @@ public Builder setExtraCss(String css) {
 		 *
 		 * @param size
 		 *            cache size, must be non-negative
-     * @return this builder instance for method chaining
+		 * @return this builder instance for method chaining
 		 * @throws IllegalArgumentException
 		 *             if size is negative
 		 */
@@ -166,7 +182,7 @@ public Builder setCacheSize(int size) {
 		 *
 		 * @param cap
 		 *            initial node capacity, must be positive
-     * @return this builder instance for method chaining
+		 * @return this builder instance for method chaining
 		 * @throws IllegalArgumentException
 		 *             if cap is zero or negative
 		 */
@@ -184,7 +200,7 @@ public Builder setPreallocateNodeCapacity(int cap) {
 		 * @return a new immutable configuration instance
 		 */
 		public CssInlineConfig build() {
-			return new CssInlineConfig(inlineStyleTags, keepStyleTags, keepLinkTags, keepAtRules, loadRemoteStylesheets, baseUrl,
+			return new CssInlineConfig(inlineStyleTags, keepStyleTags, keepLinkTags, keepAtRules, minifyCss, loadRemoteStylesheets, baseUrl,
 					extraCss, cacheSize, preallocateNodeCapacity);
 		}
 	}

diff --git a/bindings/java/src/main/rust/lib.rs b/bindings/java/src/main/rust/lib.rs
@@ -18,7 +18,7 @@ trait JNIExt {
 
 impl<'a> JNIExt for JNIEnv<'a> {
     fn get_rust_string(&mut self, obj: &JString) -> String {
-        self.get_string(&obj)
+        self.get_string(obj)
             .expect("Failed to get Java String")
             .into()
     }
@@ -75,6 +75,7 @@ fn build_inliner(
     let keep_style_tags = env.get_bool_field(&cfg, "keepStyleTags")?;
     let keep_link_tags = env.get_bool_field(&cfg, "keepLinkTags")?;
     let keep_at_rules = env.get_bool_field(&cfg, "keepAtRules")?;
+    let minify_css = env.get_bool_field(&cfg, "minifyCss")?;
     let load_remote_stylesheets = env.get_bool_field(&cfg, "loadRemoteStylesheets")?;
     let cache_size = env.get_int_field(&cfg, "cacheSize")?;
     let preallocate_node_capacity = env.get_int_field(&cfg, "preallocateNodeCapacity")?;
@@ -86,6 +87,7 @@ fn build_inliner(
         .keep_style_tags(keep_style_tags)
         .keep_link_tags(keep_link_tags)
         .keep_at_rules(keep_at_rules)
+        .minify_css(minify_css)
         .load_remote_stylesheets(load_remote_stylesheets)
         .extra_css(extra_css.map(Cow::Owned))
         .preallocate_node_capacity(preallocate_node_capacity as usize);

diff --git a/bindings/javascript/CHANGELOG.md b/bindings/javascript/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 ## [Unreleased]
 
+### Added
+
+- `minify_css` option [#12](https://github.com/Stranger6667/css-inline/issues/12)
+
+### Changed
+
+- Bump MSRV to `1.80`
+
 ## [0.17.0] - 2025-07-26
 
 ### Added

diff --git a/bindings/javascript/Cargo.toml b/bindings/javascript/Cargo.toml
@@ -9,7 +9,7 @@ repository = "https://github.com/Stranger6667/css-inline"
 keywords = ["css", "html", "email", "stylesheet", "inlining"]
 categories = ["web-programming"]
 license = "MIT"
-rust-version = "1.77"
+rust-version = "1.80"
 include = ["src/*.rs", "LICENSE", "README.md", "CHANGELOG.md"]
 
 [lib]

diff --git a/bindings/javascript/README.md b/bindings/javascript/README.md
@@ -117,6 +117,7 @@ var inlined = inlineFragment(
 - `keepStyleTags`. Specifies whether to keep "style" tags after inlining. Default: `false`
 - `keepLinkTags`. Specifies whether to keep "link" tags after inlining. Default: `false`
 - `keepAtRules`. Specifies whether to keep "at-rules" (starting with `@`) after inlining. Default: `false`
+- `minifyCss`. Specifies whether to remove trailing semicolons and spaces between properties and values. Default: `false`
 - `baseUrl`. The base URL used to resolve relative URLs. If you'd like to load stylesheets from your filesystem, use the `file://` scheme. Default: `null`
 - `loadRemoteStylesheets`. Specifies whether remote stylesheets should be loaded. Default: `true`
 - `cache`. Specifies caching options for external stylesheets (for example, `{size: 5}`). Default: `null`
@@ -177,6 +178,19 @@ Such tags will be kept in the resulting HTML even if the `keep_style_tags` optio
 </body>
 ```
 
+If you set the the `minify_css` option to `true`, the inlined styles will be minified by removing trailing semicolons
+and spaces between properties and values.
+
+```html
+<head>
+  <!-- With minify_css=true, the <h1> will have `style="color:blue;font-weight:bold"` -->
+  <style>h1 { color: blue; font-weight: bold; }</style>
+</head>
+<body>
+  <h1>Big Text</h1>
+</body>
+```
+
 You can also cache external stylesheets to avoid excessive network requests:
 
 ```typescript

diff --git a/bindings/javascript/index.d.ts b/bindings/javascript/index.d.ts
@@ -20,6 +20,8 @@ export interface Options {
   keepLinkTags?: boolean
   /** Keep "at-rules" after inlining. */
   keepAtRules?: boolean
+  /** Remove trailing semicolons and spaces between properties and values. */
+  minifyCss?: boolean
   /** Used for loading external stylesheets via relative URLs. */
   baseUrl?: string
   /** Whether remote stylesheets should be loaded or not. */

diff --git a/bindings/javascript/js-binding.d.ts b/bindings/javascript/js-binding.d.ts
@@ -19,6 +19,10 @@ export interface Options {
   keepStyleTags?: boolean
   /** Keep "link" tags after inlining. */
   keepLinkTags?: boolean
+  /** Keep "at-rules" after inlining. */
+  keepAtRules?: boolean
+  /** Remove trailing semicolons and spaces between properties and values. */
+  minifyCss?: boolean
   /** Used for loading external stylesheets via relative URLs. */
   baseUrl?: string
   /** Whether remote stylesheets should be loaded or not. */

diff --git a/bindings/javascript/src/lib.rs b/bindings/javascript/src/lib.rs
@@ -75,6 +75,7 @@ const INLINE: &'static str = r#"export interface InlineOptions {
     keepStyleTags?: boolean,
     keepLinkTags?: boolean,
     keepAtRules?: boolean,
+    minifyCss?: boolean,
     baseUrl?: string,
     loadRemoteStylesheets?: boolean,
     extraCss?: string,

diff --git a/bindings/javascript/src/options.rs b/bindings/javascript/src/options.rs
@@ -42,6 +42,8 @@ pub struct Options {
     pub keep_link_tags: Option<bool>,
     /// Keep "at-rules" after inlining.
     pub keep_at_rules: Option<bool>,
+    /// Remove trailing semicolons and spaces between properties and values.
+    pub minify_css: Option<bool>,
     /// Used for loading external stylesheets via relative URLs.
     pub base_url: Option<String>,
     /// Whether remote stylesheets should be loaded or not.
@@ -65,6 +67,7 @@ impl TryFrom<Options> for css_inline::InlineOptions<'_> {
             keep_style_tags: value.keep_style_tags.unwrap_or(false),
             keep_link_tags: value.keep_link_tags.unwrap_or(false),
             keep_at_rules: value.keep_at_rules.unwrap_or(false),
+            minify_css: value.minify_css.unwrap_or(false),
             base_url: parse_url(value.base_url)?,
             load_remote_stylesheets: value.load_remote_stylesheets.unwrap_or(true),
             extra_css: value.extra_css.map(Cow::Owned),

diff --git a/bindings/javascript/wasm/index.d.ts b/bindings/javascript/wasm/index.d.ts
@@ -7,6 +7,7 @@ export interface InlineOptions {
 	keepStyleTags?: boolean;
 	keepLinkTags?: boolean;
 	keepAtRules?: boolean;
+	minifyCss?: boolean;
 	baseUrl?: string;
 	loadRemoteStylesheets?: boolean;
 	extraCss?: string;