Free deep linking tools
Short answer
Three free tools, no login and no signup: an AASA & assetlinks.json generator for setting up Universal Links and App Links, a deep link debugger for working out why an existing setup fails, and a Firebase Dynamic Links migration checker for teams moving off FDL. All three run in the browser and none require an account.
AASA & assetlinks.json Generator
Generate a valid apple-app-site-association file for iOS Universal Links and an assetlinks.json for Android App Links. Runs entirely in your browser — paste your team ID, bundle ID, package name, and SHA-256 fingerprint, and get syntax-highlighted output plus a hosting guide.
Use it when: Setting up deep linking on a new domain.
Deep Link Debugger
Check whether a live domain is correctly configured for Universal Links and Android App Links. Fetches the association files, validates their structure and content type, and reports exactly which step is failing.
Use it when: Your links open Safari or Chrome instead of the app.
Firebase Dynamic Links Migration Checker
Paste a page.link URL to see what it was configured to do, and get the equivalent Deeplinkly link configuration. Firebase Dynamic Links shut down on 25 August 2025 and every page.link URL has stopped resolving.
Use it when: Migrating off Firebase Dynamic Links.
New to deep linking? Start with what deep linking is and how deferred deep linking works.