Interaction to Next Paint (INP) Test
Check INP against the 200ms threshold — and understand why a lab test alone can never give you one.
- 100% free
- No sign-up
- No limits
- Instant results
What is Interaction to Next Paint (INP) Test?
Interaction to Next Paint replaced First Input Delay as a Core Web Vital in March 2024.
It measures the full latency of an interaction — from the tap or click, through the work your JavaScript does, to the next frame the browser actually paints. FID only measured the delay before processing started, which flattered pages that acknowledged a click quickly and then froze. INP is harder to satisfy and much closer to what people mean by "this page feels slow". It is also a field metric: it requires real people interacting, so it can only come from the Chrome UX Report. If your site does not have enough traffic to appear there, INP is genuinely unavailable, and this tool says so rather than showing you a lab number dressed up as one.
How to use Interaction to Next Paint (INP) Test
- 1
Enter your page
INP arrives with the PageSpeed response when the Chrome UX Report has enough data for the URL or its origin.
- 2
If it is unavailable, use Total Blocking Time
TBT is the lab metric that correlates best with INP. It is not the same measurement, but a high TBT reliably predicts a poor INP.
- 3
Find the long tasks
INP is usually one slow event handler, not general sluggishness. Profile the interaction that feels worst rather than the page as a whole.
- 4
Break up the work
Yield to the main thread between chunks, move heavy computation off it, and render the visual acknowledgement before doing the work.
Everything this tool
does for you
- INP from field data where available
- Honest unavailable state, with the reason
- Total Blocking Time as the lab proxy
- Google’s 200ms and 500ms thresholds
- Free, no signup, no daily limit
Related free tools
Frequently asked questions
This tool fixed one thing.
Now fix the whole site.
Our scanner runs 240+ checks across 10 audit areas, ranks every issue by the score points it costs, and hands you the code to paste.
Run a free audit- INP from field data when your site has it
- Total Blocking Time shown as the lab proxy that does exist
- Google’s 200ms / 500ms thresholds
- Explains plainly when the metric is unavailable
- Free, no account, no daily limit