diff --git a/src/controllers/index.ts b/src/controllers/index.ts
index 584c6d4..a6d8a4b 100644
--- a/src/controllers/index.ts
+++ b/src/controllers/index.ts
@@ -13,16 +13,12 @@ import { RouteHandlerMethod } from 'fastify'
 import sharp, { FitEnum, FormatEnum } from 'sharp'
 import { flatten, unflatten } from 'flat'
 import ms from 'ms'
-import DeviceDetector from 'device-detector-js'
-import Avif from 'caniuse-db/features-json/avif.json'
-import WebP from 'caniuse-db/features-json/webp.json'
 
 import { storage } from '../storage'
 import { transform } from '../transform'
 import { sha3, sortObjectByKeys, validateSyncOrFail } from '../utils/utils'
 import { Config, URLClean } from '../config'
-
-const detector = new DeviceDetector()
+import { supportsAvif, supportsWebP } from '../utils/caniuse'
 
 export class ComplexParameter<N = string, T extends object = {}> {
   @IsString()
@@ -170,11 +166,9 @@ export class TransformQueryBase {
   }
 
   autoFormat(ua: string) {
-    const parsed = detector.parse(ua)
-    //https://caniuse.com/avif
-    console.log(parsed)
-    console.log(WebP)
-    // https://caniuse.com/webp
+    if (supportsAvif(ua)) this.format!.name = 'avif'
+    else if (supportsWebP(ua)) this.format!.name = 'webp'
+    else this.format!.name = 'jpeg'
   }
 }
 
diff --git a/src/utils/caniuse.ts b/src/utils/caniuse.ts
index ee4c0e6..e7b2ffc 100644
--- a/src/utils/caniuse.ts
+++ b/src/utils/caniuse.ts
@@ -4,16 +4,17 @@ import WebP from 'caniuse-db/features-json/webp.json'
 
 const detector = new DeviceDetector()
 
-function findLowestCompatibleVersion(stat: Record<string, string>): string {
+function findLowestSupportedVersion(stat: Record<string, string>): number | null {
   const entries = Object.entries(stat).sort((a, b) => parseInt(a[0]) - parseInt(b[0]))
   for (const [version, support] of entries) {
     if (support.startsWith('y') || support.startsWith('a')) {
-      return version
+      return parseInt(version)
     }
   }
+  return null
 }
 
-const mapping = {
+const BrowserMappings = {
   'Internet Explorer': 'ie',
   'Microsoft Edge': 'edge',
   Firefox: 'firefox',
@@ -31,20 +32,40 @@ const mapping = {
 }
 
 function matchBrowserToStat(browser: DeviceDetector.DeviceDetectorResult): string {
-  if (!browser.os || !browser.client) throw new Error('Invalid browser')
-  if (browser.os.name === 'iOS') {
+  if (browser.os!.name === 'iOS') {
     return 'ios_saf'
   }
-  if (browser.os.name in mapping) {
-    return mapping[browser.os.name as keyof typeof mapping]
+  if (browser.client!.name in BrowserMappings) {
+    return BrowserMappings[browser.client!.name as keyof typeof BrowserMappings]
   }
   throw new Error('Could not determine mapping for browser')
 }
 
 function match(feature: typeof Avif | typeof WebP, ua: string): boolean {
   const browser = detector.parse(ua)
+  if (!browser.client || !browser.os) {
+    throw new Error('Could not parse browser')
+  }
   const stats = feature.stats[matchBrowserToStat(browser) as keyof typeof feature.stats]
-  console.debug(stats)
-  console.debug(findLowestCompatibleVersion(stats))
-  return false
+  const lowestSupported = findLowestSupportedVersion(stats)
+  if (lowestSupported === null) {
+    return false
+  }
+  return lowestSupported <= parseInt(browser.client.version)
+}
+
+export function supportsAvif(ua: string): boolean {
+  try {
+    return match(Avif, ua)
+  } catch {
+    return false
+  }
+}
+
+export function supportsWebP(ua: string): boolean {
+  try {
+    return match(WebP, ua)
+  } catch {
+    return false
+  }
 }