Your files stay on your device

Mobile push payload builder

Build APNs and FCM HTTP v1 notification payloads in the browser, with required key checks, 4 KB size accounting, and curl templates.

The payloads compile as you type.

Check a payload you already have

This tool builds payloads and curl templates only. It never sends anything: the shell commands carry placeholder names (APNS_JWT, DEVICE_TOKEN, ACCESS_TOKEN, PROJECT_ID) that you fill in your own terminal, and the page never sees your credentials. A device token is a secret; generate one on the device and paste it straight into your shell, never into a web page you do not control. Both services cap a payload at 4,096 UTF-8 bytes, and the byte counts here are exact.

Push setup

Kind of push

Title

Body

Custom dataOne key=value per line; values ship as strings for FCM

Collapse ID / key

Keep for (seconds)

A collapse ID replaces an earlier notification with the same ID. Blank keep-for uses each service's default; 0 means deliver now or drop.

More settings

Apple (APNs)

Topic, priority, collapse id, and expiration ride as HTTP headers; everything else lives in the aps object.

Bundle ID (apns-topic)

apns-priority

Sound

Badge

Thread ID

Interruption level

Mutable contentLet a notification service extension rewrite the alert

More settings

Firebase (FCM HTTP v1)

The token below is a placeholder, never a real credential.

Send to

android.priority

Android channel ID

Include an apns blockGive iOS devices the same Apple options through FCM

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Mobile push payload builder

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