---
title: Find Horizontal Overflow at a Chosen Viewport Width — Free
description: A page that looks fine on a desktop can still force sideways scrolling at a phone width. Compare measured content widths with the width you are testing, and see which patterns need rework first.
category: accessibility
last_verified: 2026-09-29
freshness: green
published: 2026-09-29
canonical_url: https://gratis-ai.pages.dev/articles/reflow-overflow-width-check.html
companion_app_url: https://gratis-ai.pages.dev/apps/reflow-overflow-width-check.html
reading_time_minutes: 4
tags: accessibility, reflow, local-first, planning, no-account
---

# Find Horizontal Overflow at a Chosen Viewport Width — Free

A page that looks fine on a desktop can still force sideways scrolling at a phone width. Compare measured content widths with the width you are testing, and see which patterns need rework first.

**Free and complete.** This guide is a standalone free tool — no account, no card, anywhere. The only paid option is one optional extra outcome: $4 one-time. Nothing in the free tier is gated.

## Who it's for

Anyone seeking practical 100% free AI workflows — no paid API keys, credit cards, or subscriptions

## What's free

- one complete reflow ruler run in the app
- three samples plus unlimited article-demo runs
- unwatermarked result text and an explicit, user-triggered state link

## Optional paid add-on

**$4 one-time.**

- print the reflow ruler with its row workings
- CSV of CSS px overflow and row explanations
- last five reading summaries saved in this browser profile

## Sources & verification

- Tool: GratisAI local-first instrument (no key, no account)
- Primary source: the free tool itself (local-first, no external dependency)
- Last verification: 2026-09-29 (green)

## Use it

- Interactive guide: https://gratis-ai.pages.dev/articles/reflow-overflow-width-check.html
- Companion app: https://gratis-ai.pages.dev/apps/reflow-overflow-width-check.html
- This machine-readable mirror: /mirrors/reflow-overflow-width-check.md

*Generated free at https://gratis-ai.pages.dev/articles/reflow-overflow-width-check.html — every guide on GratisAI is a complete, working tool. $0, no account, no card, anywhere.*