---
title: "Best How to Use OptiScaler: Overlay Guide"
description: "Understand how to open the OptiScaler overlay, choose an output upscaler, verify the active path, and fix a missing overlay without changing everything at once."
canonical: https://optiscaler.ink/keywords/best-how-to-use-optiscaler
updated: 2026-10-18
---

# Best How to Use OptiScaler

Understand how to open the OptiScaler overlay, choose an output upscaler, verify the active path, and fix a missing overlay without changing everything at once.

The easiest way to understand OptiScaler is to separate the game input from the OptiScaler output. The game exposes an upscaler in its menu; OptiScaler can intercept that supported input and redirect it to the output you choose in its overlay, which is commonly opened with Insert.

## Open the Overlay with Insert

Press Insert once the game is running with OptiScaler installed. On some keyboard layouts the game and configuration may need an alternate combination, so check the configured shortcut before assuming the install failed.

## Why the Overlay Does Not Appear

Work through the usual causes in order: files outside the correct game executable folder, the wrong proxy DLL for that game and API, input-hook conflicts with other overlays, and finally a game-specific compatibility issue.

## Rule Out Overlay Conflicts

Temporarily disable other overlays that may capture the same input or graphics hooks, then launch the game offline and press Insert again.

## Input vs Output

Treat the input as the upscaler option selected inside the game, and the output as the technology selected inside OptiScaler. This distinction helps when a title says DLSS in its menu but another backend is actually doing the upscaling.

## Verify the Active Backend

Do not judge only by the game menu label. Use the information shown by OptiScaler and any available backend indicator or watermark to confirm which output is actually active.

## Practical Checklist

- Press Insert in game and check the configured shortcut if nothing opens.
- Keep original files backed up before changing the game folder.
- Test one setting or backend at a time.
- Avoid anti-cheat protected online sessions.
- Document the working configuration before updating.

## Related

- [How to fix the OptiScaler overlay not showing](https://optiscaler.ink/how-to/how-to-fix-overlay-not-showing)
- [Latest How to Use OptiScaler](https://optiscaler.ink/keywords/latest-how-to-use-optiscaler)
- [OptiScaler Best How to Use](https://optiscaler.ink/keywords/optiscaler-best-how-to-use)

## Download

ZIP next to the game executable: [Download OptiScaler](https://optiscaler.ink/download)

Markdown mirror: https://optiscaler.ink/keywords/best-how-to-use-optiscaler.md