diff --git a/tracker/tracker/src/common/interaction.ts b/tracker/tracker/src/common/interaction.ts
index 9fe543661..311141169 100644
--- a/tracker/tracker/src/common/interaction.ts
+++ b/tracker/tracker/src/common/interaction.ts
@@ -19,11 +19,21 @@ type Auth = {
   beaconSizeLimit?: number
 }
 
-export type ToWorkerData = null | 'stop' | Start | Auth | Array<Message>
+export type ToWorkerData =
+  | null
+  | 'stop'
+  | Start
+  | Auth
+  | Array<Message>
+  | { type: 'compressed'; batch: Uint8Array }
 
 type Failure = {
   type: 'failure'
   reason: string
 }
 
-export type FromWorkerData = 'restart' | Failure | 'not_init'
+export type FromWorkerData =
+  | 'restart'
+  | Failure
+  | 'not_init'
+  | { type: 'compress'; batch: Uint8Array }
diff --git a/tracker/tracker/src/main/app/index.ts b/tracker/tracker/src/main/app/index.ts
index 24a385a60..0b7ccc43c 100644
--- a/tracker/tracker/src/main/app/index.ts
+++ b/tracker/tracker/src/main/app/index.ts
@@ -7,7 +7,7 @@ import Sanitizer from './sanitizer.js'
 import Ticker from './ticker.js'
 import Logger, { LogLevel } from './logger.js'
 import Session from './session.js'
-import { gzip, strToU8 } from 'fflate'
+import { gzip } from 'fflate'
 import { deviceMemory, jsHeapSizeLimit } from '../modules/performance.js'
 
 import type { Options as ObserverOptions } from './observer/top_observer.js'
@@ -22,6 +22,9 @@ import type {
   FromWorkerData,
 } from '../../common/interaction.js'
 
+// @ts-ignore
+window.gzip = gzip
+
 interface TypedWorker extends Omit<Worker, 'postMessage'> {
   postMessage(data: ToWorkerData): void
 }
@@ -175,6 +178,11 @@ export default class App {
         } else if (data.type === 'failure') {
           this.stop(false)
           this._debug('worker_failed', data.reason)
+        } else if (data.type === 'compress') {
+          gzip(data.batch, (err, result) => {
+            if (err) console.error(err)
+            this.worker?.postMessage({ type: 'compressed', batch: result })
+          })
         }
       }
       const alertWorker = () => {
@@ -208,13 +216,6 @@ export default class App {
 
   private _usingOldFetchPlugin = false
   send(message: Message, urgent = false): void {
-    // @ts-ignore
-    const compressedMessage = message.reduce((acc, curr, index) => {
-      if (index === 0) return curr
-      // @ts-ignore
-      return gzip(strToU8(curr.toString()), (err, data) => data)
-    }, [])
-    console.log(message, compressedMessage)
     if (this.activityState === ActivityState.NotActive) {
       return
     }
diff --git a/tracker/tracker/src/webworker/QueueSender.ts b/tracker/tracker/src/webworker/QueueSender.ts
index 337aba2df..839b51121 100644
--- a/tracker/tracker/src/webworker/QueueSender.ts
+++ b/tracker/tracker/src/webworker/QueueSender.ts
@@ -8,12 +8,14 @@ export default class QueueSender {
   private readonly queue: Array<Uint8Array> = []
   private readonly ingestURL
   private token: string | null = null
+
   constructor(
     ingestBaseURL: string,
     private readonly onUnauthorised: () => any,
     private readonly onFailure: (reason: string) => any,
     private readonly MAX_ATTEMPTS_COUNT = 10,
     private readonly ATTEMPT_TIMEOUT = 1000,
+    private readonly onCompress: (batch: Uint8Array) => any,
   ) {
     this.ingestURL = ingestBaseURL + INGEST_PATH
   }
@@ -30,14 +32,14 @@ export default class QueueSender {
     if (this.busy || !this.token) {
       this.queue.push(batch)
     } else {
-      this.sendBatch(batch)
+      this.onCompress(batch)
     }
   }
 
   private sendNext() {
     const nextBatch = this.queue.shift()
     if (nextBatch) {
-      this.sendBatch(nextBatch)
+      this.onCompress(nextBatch)
     } else {
       this.busy = false
     }
@@ -50,7 +52,7 @@ export default class QueueSender {
       return
     }
     this.attemptsCount++
-    setTimeout(() => this.sendBatch(batch), this.ATTEMPT_TIMEOUT * this.attemptsCount)
+    setTimeout(() => this.onCompress(batch), this.ATTEMPT_TIMEOUT * this.attemptsCount)
   }
 
   // would be nice to use Beacon API, but it is not available in WebWorker
@@ -64,6 +66,7 @@ export default class QueueSender {
       headers: {
         Authorization: `Bearer ${this.token as string}`,
         //"Content-Type": "",
+        'Content-Encoding': 'gzip',
       },
       keepalive: batch.length < KEEPALIVE_SIZE_LIMIT,
     })
@@ -88,6 +91,10 @@ export default class QueueSender {
       })
   }
 
+  sendCompressed(batch: Uint8Array) {
+    this.sendBatch(batch)
+  }
+
   clean() {
     this.queue.length = 0
     this.token = null
diff --git a/tracker/tracker/src/webworker/index.ts b/tracker/tracker/src/webworker/index.ts
index e821cc6bd..776139061 100644
--- a/tracker/tracker/src/webworker/index.ts
+++ b/tracker/tracker/src/webworker/index.ts
@@ -117,6 +117,7 @@ self.onmessage = ({ data }: any): any => {
       },
       data.connAttemptCount,
       data.connAttemptGap,
+      (batch) => postMessage({ type: 'compress', batch }),
     )
     writer = new BatchWriter(
       data.pageNo,
@@ -130,6 +131,9 @@ self.onmessage = ({ data }: any): any => {
     }
     return (workerStatus = WorkerStatus.Active)
   }
+  if (data.type === 'compressed') {
+    sender?.sendCompressed(data.batch)
+  }
 
   if (data.type === 'auth') {
     if (!sender) {