diff --git a/README.md b/README.md
index 402084a..7a44dc1 100644
--- a/README.md
+++ b/README.md
@@ -222,6 +222,7 @@ minify:
 - **include** - Include files. Support [wildcard](http://www.globtester.com/) pattern(s) in a string or array.
   - Support one-liner, `include: ['*.html','*.css','*.js']`.
   - Must include asterisk and single quotes. `.html` is invalid. `'*.html'` is valid.
+- **ensureCompressed** - Ensure the compressed file is smaller than the original, otherwise do not output. Defaults to `true`.
 - **globOptions** - See [globbing](#globbing) section.
 - **level** - Compression level; lower value may results in faster compression but slightly larger (compressed) file. Range `1-9`. Defaults to `9`, or the value of [`zlib.constants.Z_BEST_COMPRESSION`](https://nodejs.org/docs/latest-v12.x/api/zlib.html#zlib_zlib_constants)
 
@@ -252,6 +253,7 @@ minify:
 - **priority** - Plugin's priority. Defaults to `10`.
 - **verbose** - Verbose output. Defaults to `false`.
 - **include** - Include files. Support [wildcard](http://www.globtester.com/) pattern(s) in a string or array.
+- **ensureCompressed** - Ensure the compressed file is smaller than the original, otherwise do not output. Defaults to `true`.
 - **globOptions** - See [globbing](#globbing) section.
 - **level** - Compression level. Range `1-11`. Defaults to `11`, or the value of [`zlib.constants.BROTLI_MAX_QUALITY`](https://nodejs.org/docs/latest-v12.x/api/zlib.html#zlib_brotli_constants)
 
@@ -282,6 +284,7 @@ minify:
 - **priority** - Plugin's priority. Defaults to `10`.
 - **verbose** - Verbose output. Defaults to `false`.
 - **include** - Include files. Support [wildcard](http://www.globtester.com/) pattern(s) in a string or array.
+- **ensureCompressed** - Ensure the compressed file is smaller than the original, otherwise do not output. Defaults to `true`.
 - **globOptions** - See [globbing](#globbing) section.
 - **level** - Compression level. Range `1-22`. Defaults to `3`, or the value of [`DEFAULT_LEVEL`](https://github.com/mongodb-js/zstd/blob/a3a08c61c9045411c8275e248498dbc583457fb5/src/lib.rs#L9)
 
diff --git a/index.js b/index.js
index a646f36..85d4033 100644
--- a/index.js
+++ b/index.js
@@ -85,6 +85,7 @@ hexo.config.minify.gzip = {
   priority: 10,
   verbose: false,
   include: ['*.html', '*.css', '*.js', '*.map', '*.wasm', '*.txt', '*.ttf', '*.atom', '*.stl', '*.xml', '*.svg', '*.eot', '*.json', '*.webmanifest'],
+  ensureCompressed: true,
   globOptions: { basename: true },
   ...hexo.config.minify.gzip
 }
@@ -94,6 +95,7 @@ hexo.config.minify.brotli = {
   priority: 10,
   verbose: false,
   include: ['*.html', '*.css', '*.js', '*.map', '*.wasm', '*.txt', '*.ttf', '*.atom', '*.stl', '*.xml', '*.svg', '*.eot', '*.json', '*.webmanifest'],
+  ensureCompressed: true,
   globOptions: { basename: true },
   ...hexo.config.minify.brotli
 }
@@ -103,6 +105,7 @@ hexo.config.minify.zstd = {
   priority: 10,
   verbose: false,
   include: ['*.html', '*.css', '*.js', '*.map', '*.wasm', '*.txt', '*.ttf', '*.atom', '*.stl', '*.xml', '*.svg', '*.eot', '*.json', '*.webmanifest'],
+  ensureCompressed: true,
   globOptions: { basename: true },
   ...hexo.config.minify.zstd
 }
diff --git a/lib/tools.js b/lib/tools.js
index 2268fd1..d381d4c 100644
--- a/lib/tools.js
+++ b/lib/tools.js
@@ -54,10 +54,10 @@ function match(paths = [], patterns = [], options = {}) {
 }
 
 /**
- * @param {string} original
- * @param {string} ext
- * @param {string} minified
+ * @param {{ length: number }} original
+ * @param {{ length: number }} minified
  * @param {string} path
+ * @param {string} ext
  */
 function logFn(original, minified, path, ext) {
   const saved = ((original.length - minified.length) / original.length * 100).toFixed(2)
diff --git a/lib/zlib.js b/lib/zlib.js
index 5b3a8f5..e3de80b 100644
--- a/lib/zlib.js
+++ b/lib/zlib.js
@@ -12,7 +12,7 @@ function gzipFn() {
   const route = hexo.route
   /** @type {string[]} */
   const routeList = route.list()
-  const { globOptions, include, verbose } = options
+  const { globOptions, include, verbose, ensureCompressed } = options
   let level = options.level
   if (typeof level !== 'number') level = zlib.constants.Z_BEST_COMPRESSION
 
@@ -25,9 +25,11 @@ function gzipFn() {
         if (assetTxt.length) {
           try {
             const result = await gzip(assetTxt, { level })
-            if (verbose) logFn.call(this, assetTxt, result, path, 'gzip')
-            resolve(route.set(path + '.gz', result))
-            return
+            const buffer = Buffer.from(assetTxt)
+            if (verbose) logFn.call(this, buffer, result, path, 'gzip')
+            if (!ensureCompressed || buffer.length > result.length) {
+              route.set(path + '.gz', result)
+            }
           } catch (err) {
             reject(new Error(`Path: ${path}\n${err}`))
           }
@@ -45,7 +47,7 @@ function brotliFn() {
   const route = hexo.route
   /** @type {string[]} */
   const routeList = route.list()
-  const { globOptions, include, verbose } = options
+  const { globOptions, include, verbose, ensureCompressed } = options
   let level = options.level
   if (typeof level !== 'number') level = zlib.constants.BROTLI_MAX_QUALITY
 
@@ -58,8 +60,11 @@ function brotliFn() {
         if (assetTxt.length) {
           try {
             const result = await br(assetTxt, { params: { [zlib.constants.BROTLI_PARAM_QUALITY]: level } })
-            if (verbose) logFn.call(this, assetTxt, result, path, 'brotli')
-            route.set(path + '.br', result)
+            const buffer = Buffer.from(assetTxt)
+            if (verbose) logFn.call(this, buffer, result, path, 'brotli')
+            if (!ensureCompressed || buffer.length > result.length) {
+              route.set(path + '.br', result)
+            }
           } catch (err) {
             reject(new Error(`Path: ${path}\n${err}`))
           }
diff --git a/lib/zstd.js b/lib/zstd.js
index 3b95bfd..a3b6a75 100644
--- a/lib/zstd.js
+++ b/lib/zstd.js
@@ -9,7 +9,7 @@ function zstdFn() {
   const route = hexo.route
   /** @type {string[]} */
   const routeList = route.list()
-  const { globOptions, include, verbose } = options
+  const { globOptions, include, verbose, ensureCompressed } = options
   let level = options.level
   if (typeof level !== 'number') level = undefined
 
@@ -23,8 +23,10 @@ function zstdFn() {
           try {
             const input = Buffer.from(assetTxt, 'utf-8')
             const result = await zstd(input, level)
-            if (verbose) logFn.call(this, assetTxt, result, path, 'zstd')
-            route.set(path + '.zst', result)
+            if (verbose) logFn.call(this, input, result, path, 'zstd')
+            if (!ensureCompressed || input.length > result.length) {
+              route.set(path + '.zst', result)
+            }
           } catch (err) {
             reject(new Error(`Path: ${path}\n${err}`))
           }