Pixel-Perfect Browser Resizing for Screenshots

ViewPorter is a free developer tool that opens controlled popup windows at exact pixel dimensions, making pixel-perfect screenshots effortless for any device or resolution.

The Problem

Developers and designers regularly need screenshots at precise viewport dimensions — for portfolio pieces, App Store previews, client deliverables, and design documentation. Manually resizing a browser window is frustratingly imprecise: OS chrome, snap zones, and lack of feedback mean your "1440×900" window is rarely actually 1440×900.

The Solution

ViewPorter uses window.open() with explicit dimension parameters to launch a popup at exactly the width and height you specify — then exposes window.resizeTo() through a Resize button so you can adjust without reopening.

The tool is entirely client-side, zero-install, and works in any modern browser.

Features

Exact Pixel Control

Set width and height to any value from 200–5000px. Fine-tune with arrow buttons or type exact values. A live dimension preview updates as you type.

Device Presets

One-click presets for the most common screenshot targets:

• iPhone 14 — 390×844
• iPhone SE — 375×667
• Android — 360×800
• Tablet — 768×1024
• Laptop — 1440×900
• Full HD — 1920×1080

Aspect Ratio Lock

Lock the aspect ratio and adjust one dimension — the other updates proportionally to keep things consistent.

URL Loading

Enter any URL and it loads inside the popup on launch. Leave blank to open an empty window for manual navigation.

Resize on Demand

Adjust window dimensions without closing and reopening — useful for comparing designs across breakpoints without losing scroll position.

Built-in Screenshot Tips

Practical, opinionated tips for capturing clean screenshots: hide DevTools first, disable scrollbars via a DevTools snippet, use native OS capture for shadow-free window screenshots, use GoFullPage for full-page captures.

Part of the Jagodana Tools Suite

ViewPorter is one of several free tools built for developers and designers:

• Screenshot Beautifier
• OG Preview
• Favicon Generator
• Theme Contrast Checker
• Regex Playground
• Logo Maker