diff --git a/src/cli.ts b/src/cli.ts
index cb9da040..217de215 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -5,9 +5,9 @@ import {readFile, writeFile, existsSync, lstatSync, readdirSync} from 'mz/fs'
 import * as mkdirp from 'mkdirp'
 import {glob} from 'glob'
 import isGlob from 'is-glob'
-import {join, resolve, dirname, basename} from 'path'
+import {join, resolve, dirname} from 'path'
 import {compile, DEFAULT_OPTIONS, Options} from './index'
-import {pathTransform, error} from './utils'
+import {pathTransform, error, parseFileAsJSONSchema, justName} from './utils'
 
 main(
   minimist(process.argv.slice(2), {
@@ -88,7 +88,7 @@ async function processGlob(argIn: string, argOut: string | undefined, argv: Part
 
   // careful to do this serially
   results.forEach(([file, result]) => {
-    const outputPath = argOut && `${argOut}/${basename(file, '.json')}.d.ts`
+    const outputPath = argOut && `${argOut}/${justName(file)}.d.ts`
     outputResult(result, outputPath)
   })
 }
@@ -110,7 +110,7 @@ async function processDir(argIn: string, argOut: string | undefined, argv: Parti
 
   // careful to do this serially
   results.forEach(([file, result, outputPath]) =>
-    outputResult(result, outputPath ? `${outputPath}/${basename(file, '.json')}.d.ts` : undefined),
+    outputResult(result, outputPath ? `${outputPath}/${justName(file)}.d.ts` : undefined),
   )
 }
 
@@ -126,7 +126,8 @@ async function outputResult(result: string, outputPath: string | undefined): Pro
 }
 
 async function processFile(argIn: string, argv: Partial<Options>): Promise<string> {
-  const schema = JSON.parse(await readInput(argIn))
+  const {filename, contents} = await readInput(argIn)
+  const schema = parseFileAsJSONSchema(filename, contents)
   return compile(schema, argIn, argv)
 }
 
@@ -140,11 +141,17 @@ function getPaths(path: string, paths: string[] = []) {
   return paths
 }
 
-async function readInput(argIn?: string): Promise<string> {
+async function readInput(argIn?: string): Promise<{filename: string | null; contents: string}> {
   if (!argIn) {
-    return readStream(process.stdin)
+    return {
+      filename: null,
+      contents: await readStream(process.stdin),
+    }
+  }
+  return {
+    filename: argIn,
+    contents: await readFile(resolve(process.cwd(), argIn), 'utf-8'),
   }
-  return readFile(resolve(process.cwd(), argIn), 'utf-8')
 }
 
 async function readStream(stream: NodeJS.ReadStream): Promise<string> {
diff --git a/src/index.ts b/src/index.ts
index 48035e84..de22beaf 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -10,13 +10,12 @@ import {normalize} from './normalizer'
 import {optimize} from './optimizer'
 import {parse} from './parser'
 import {dereference} from './resolver'
-import {error, stripExtension, Try, log} from './utils'
+import {error, stripExtension, Try, log, parseFileAsJSONSchema} from './utils'
 import {validate} from './validator'
 import {isDeepStrictEqual} from 'util'
 import {link} from './linker'
 import {validateOptions} from './optionValidator'
 import {JSONSchema as LinkedJSONSchema} from './types/JSONSchema'
-import yaml from 'js-yaml'
 
 export {EnumJSONSchema, JSONSchema, NamedEnumJSONSchema, CustomTypeJSONSchema} from './types/JSONSchema'
 
@@ -125,26 +124,7 @@ function parseAsJSONSchema(filename: string): JSONSchema4 {
       throw new ReferenceError(`Unable to read file "${filename}"`)
     },
   )
-
-  if (isYaml(filename)) {
-    return Try(
-      () => yaml.load(contents.toString()) as JSONSchema4,
-      () => {
-        throw new TypeError(`Error parsing YML in file "${filename}"`)
-      },
-    )
-  }
-
-  return Try(
-    () => JSON.parse(contents.toString()),
-    () => {
-      throw new TypeError(`Error parsing JSON in file "${filename}"`)
-    },
-  )
-}
-
-function isYaml(filename: string) {
-  return filename.endsWith('.yaml') || filename.endsWith('.yml')
+  return parseFileAsJSONSchema(filename, contents.toString())
 }
 
 export async function compile(schema: JSONSchema4, name: string, options: Partial<Options> = {}): Promise<string> {
diff --git a/src/utils.ts b/src/utils.ts
index c256dbec..c7f1f215 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,6 +1,8 @@
 import {deburr, isPlainObject, trim, upperFirst} from 'lodash'
 import {basename, dirname, extname, normalize, sep, posix} from 'path'
 import {JSONSchema, LinkedJSONSchema, Parent} from './types/JSONSchema'
+import {JSONSchema4} from 'json-schema'
+import yaml from 'js-yaml'
 
 // TODO: pull out into a separate package
 export function Try<T>(fn: () => T, err: (e: Error) => any): T {
@@ -384,3 +386,25 @@ export function isSchemaLike(schema: LinkedJSONSchema) {
 
   return true
 }
+
+export function parseFileAsJSONSchema(filename: string | null, contents: string): JSONSchema4 {
+  if (filename != null && isYaml(filename)) {
+    return Try(
+      () => yaml.load(contents.toString()) as JSONSchema4,
+      () => {
+        throw new TypeError(`Error parsing YML in file "${filename}"`)
+      },
+    )
+  }
+
+  return Try(
+    () => JSON.parse(contents.toString()),
+    () => {
+      throw new TypeError(`Error parsing JSON in file "${filename}"`)
+    },
+  )
+}
+
+function isYaml(filename: string) {
+  return filename.endsWith('.yaml') || filename.endsWith('.yml')
+}
diff --git a/test/__snapshots__/test/test.ts.md b/test/__snapshots__/test/test.ts.md
index dabcecdc..e1c6e25d 100644
--- a/test/__snapshots__/test/test.ts.md
+++ b/test/__snapshots__/test/test.ts.md
@@ -449284,6 +449284,31 @@ Generated by [AVA](https://avajs.dev).
 
 ## file in (-i), pipe out (absolute path)
 
+> Snapshot 1
+
+    `/* eslint-disable */␊
+    /**␊
+     * This file was automatically generated by json-schema-to-typescript.␊
+     * DO NOT MODIFY IT BY HAND. Instead, modify the source JSONSchema file,␊
+     * and run json-schema-to-typescript to regenerate this file.␊
+     */␊
+    ␊
+    export interface ExampleSchema {␊
+      firstName: string;␊
+      lastName: string;␊
+      /**␊
+       * Age in years␊
+       */␊
+      age?: number;␊
+      height?: number;␊
+      favoriteFoods?: unknown[];␊
+      likesDogs?: boolean;␊
+      [k: string]: unknown;␊
+    }␊
+    `
+
+## file in (yaml), pipe out
+
 > Snapshot 1
 
     `/* eslint-disable */␊
@@ -449522,6 +449547,26 @@ Generated by [AVA](https://avajs.dev).
     }␊
     `
 
+> Snapshot 5
+
+    './test/resources/MultiSchema/out/b.yaml.d.ts'
+
+> Snapshot 6
+
+    `/* eslint-disable */␊
+    /**␊
+     * This file was automatically generated by json-schema-to-typescript.␊
+     * DO NOT MODIFY IT BY HAND. Instead, modify the source JSONSchema file,␊
+     * and run json-schema-to-typescript to regenerate this file.␊
+     */␊
+    ␊
+    export interface BSchema {␊
+      x?: string;␊
+      y: number;␊
+      [k: string]: unknown;␊
+    }␊
+    `
+
 ## files in (-i), pipe out
 
 > Snapshot 1
diff --git a/test/__snapshots__/test/test.ts.snap b/test/__snapshots__/test/test.ts.snap
index 7f856f17..6640ff0a 100644
Binary files a/test/__snapshots__/test/test.ts.snap and b/test/__snapshots__/test/test.ts.snap differ
diff --git a/test/resources/MultiSchema/b.json b/test/resources/MultiSchema/b.json
deleted file mode 100644
index 05a65bf3..00000000
--- a/test/resources/MultiSchema/b.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "title": "B schema",
-  "type": "object",
-  "properties": {
-    "x": {"type": "string"},
-    "y": {"type": "integer"}
-  },
-  "additionalProperties": true,
-  "required": ["y"]
-}
\ No newline at end of file
diff --git a/test/resources/MultiSchema/b.yaml b/test/resources/MultiSchema/b.yaml
new file mode 100644
index 00000000..b950e5bb
--- /dev/null
+++ b/test/resources/MultiSchema/b.yaml
@@ -0,0 +1,10 @@
+title: B schema
+type: object
+properties:
+  x:
+    type: string
+  "y":
+    type: integer
+additionalProperties: true
+required:
+- "y"
diff --git a/test/resources/Schema.yaml b/test/resources/Schema.yaml
new file mode 100644
index 00000000..7713d126
--- /dev/null
+++ b/test/resources/Schema.yaml
@@ -0,0 +1,21 @@
+id: http://dummy.com/api/example-schema
+title: Example Schema
+type: object
+properties:
+  firstName:
+    type: string
+  lastName:
+    type: string
+  age:
+    description: Age in years
+    type: integer
+    minimum: 0
+  height:
+    type: number
+  favoriteFoods:
+    type: array
+  likesDogs:
+    type: boolean
+required:
+- firstName
+- lastName
diff --git a/test/testCLI.ts b/test/testCLI.ts
index 3e2264f5..327c1004 100644
--- a/test/testCLI.ts
+++ b/test/testCLI.ts
@@ -47,6 +47,10 @@ export function run() {
     t.snapshot(execSync(`node dist/src/cli.js -i ${__dirname}/../../test/resources/ReferencedType.json`).toString())
   })
 
+  test('file in (yaml), pipe out', t => {
+    t.snapshot(execSync('node dist/src/cli.js ./test/resources/Schema.yaml').toString())
+  })
+
   test('pipe in, file out (--output)', t => {
     execSync('shx cat ./test/resources/ReferencedType.json | node dist/src/cli.js --output ./ReferencedType.d.ts')
     t.snapshot(readFileSync('./ReferencedType.d.ts', 'utf-8'))
@@ -92,7 +96,9 @@ export function run() {
   })
 
   test('files in (-i), files out (-o)', t => {
-    execSync(`node dist/src/cli.js -i "./test/resources/MultiSchema/**/*.json" -o ./test/resources/MultiSchema/out`)
+    execSync(
+      `node dist/src/cli.js -i "./test/resources/MultiSchema/**/*.{json,yaml,yml}" -o ./test/resources/MultiSchema/out`,
+    )
 
     readdirSync('./test/resources/MultiSchema/out').forEach(f => {
       const path = `./test/resources/MultiSchema/out/${f}`
@@ -104,12 +110,12 @@ export function run() {
   })
 
   test('files in (-i), pipe out', t => {
-    t.snapshot(execSync(`node dist/src/cli.js -i "./test/resources/MultiSchema/**/*.json"`).toString())
+    t.snapshot(execSync(`node dist/src/cli.js -i "./test/resources/MultiSchema/**/*.{json,yaml,yml}"`).toString())
   })
 
   test('files in (-i), files out (-o) nested dir does not exist', t => {
     execSync(
-      `node dist/src/cli.js -i "./test/resources/MultiSchema/**/*.json" -o ./test/resources/MultiSchema/foo/bar/out`,
+      `node dist/src/cli.js -i "./test/resources/MultiSchema/**/*.{json,yaml,yml}" -o ./test/resources/MultiSchema/foo/bar/out`,
     )
     readdirSync('./test/resources/MultiSchema/foo/bar/out').forEach(f => {
       const path = `./test/resources/MultiSchema/foo/bar/out/${f}`