---
source: https://iinventedlight.com/library/notes/webdev-inp.md
title: "Interaction to Next Paint (INP)"
license: CC-BY-4.0
license_url: https://creativecommons.org/licenses/by/4.0/
source_license: "CC BY 4.0 (web.dev live page footer: 'the content of this page is licensed under the Creative Commons Attribution 4.0 License'; cite the page, not the archived repo); prose restated in our own words; footer re-checked live 2026-11-05"
license_family: web.dev
rule_check: "needs rule check (family not in auto-publish rule; check.mjs auto-approves only usgov and arxiv-ccby)"
attribution: "Summary by iinventedlight (AI-assisted). Sources: Google (web.dev), Interaction to Next Paint (INP)  |  web.dev, CC BY 4.0 (web.dev live page footer: 'the content of this page is licensed under the Creative Commons Attribution 4.0 License'; cite the page, not the archived repo); Google (web.dev), Optimize Interaction to Next Paint  |  web.dev, CC BY 4.0 (web.dev live page footer: 'the content of this page is licensed under the Creative Commons Attribution 4.0 License'; cite the page, not the archived repo)."
author: "iinventedlight (synthesis of cited sources); text drafted with AI assistance"
date: 2026-11-04
status: published
checked_on: 2026-11-05
as_of: 2026-11-05
confidence: medium
untested: "No code was run for this note; only the fetched documentation pages were read."
category: coding-references
topic_area: "web-performance"
tags: ['web-vitals', 'inp', 'responsiveness']
sources:
  - id: S1
    title: "Interaction to Next Paint (INP)  |  web.dev"
    publisher: Google (web.dev)
    url: https://web.dev/articles/inp
    accessed: 2026-11-05
    license: "CC BY 4.0 (web.dev live page footer: 'the content of this page is licensed under the Creative Commons Attribution 4.0 License'; cite the page, not the archived repo)"
  - id: S2
    title: "Optimize Interaction to Next Paint  |  web.dev"
    publisher: Google (web.dev)
    url: https://web.dev/articles/optimize-inp
    accessed: 2026-11-05
    license: "CC BY 4.0 (web.dev live page footer: 'the content of this page is licensed under the Creative Commons Attribution 4.0 License'; cite the page, not the archived repo)"
---
# Interaction to Next Paint (INP)

**Answer:** INP watches how long every interaction on a page takes to produce visual feedback, then reports one number that all, or nearly all, of those interactions stayed under. A low INP means the page answered almost every click, tap, or key press quickly. (S1)

## What it measures

- A responsive page is one that reacts quickly when the user interacts with it. (S1)
- INP does not try to capture every downstream effect of an interaction; it measures how long the next paint is held up. (S1)
- According to Chrome usage data, about 90% of the time people spend on a page comes after it has loaded, so responsiveness after load matters. (S1)

## Target

- Aim for an INP of 200 milliseconds or less. (S2)
- Judge that target at the 75th percentile of page loads, with mobile and desktop measured separately. (S2)
- Collect field data first so you know whether your INP is poor or needs improvement before trying to fix it. (S2)

## Claims
- id: C1
  claim: INP reports one value covering nearly all interactions.
  source: S1
  evidence: "and reports a single value which all (or nearly all) interactions were beneath."
- id: C2
  claim: INP measures how long the next paint is blocked.
  source: S1
  evidence: "but the time that the next paint is being blocked."
- id: C3
  claim: Good INP is 200 ms or less.
  source: S2
  evidence: "websites should strive to have an Interaction to Next Paint of 200 milliseconds or less."
- id: C4
  claim: Measure at the 75th percentile.
  source: S2
  evidence: "a good threshold to measure is the 75th percentile of page loads"

## Sources
- [S1] Interaction to Next Paint (INP)  |  web.dev. Google (web.dev). https://web.dev/articles/inp . License: CC BY 4.0 (web.dev live page footer: 'the content of this page is licensed under the Creative Commons Attribution 4.0 License'; cite the page, not the archived repo). Accessed 2026-11-05.
- [S2] Optimize Interaction to Next Paint  |  web.dev. Google (web.dev). https://web.dev/articles/optimize-inp . License: CC BY 4.0 (web.dev live page footer: 'the content of this page is licensed under the Creative Commons Attribution 4.0 License'; cite the page, not the archived repo). Accessed 2026-11-05.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted).