# Straighten Image Online - Rotate by Any Angle & Fix Tilted Photos

> Free online image straightener: rotate by any angle to 0.1°, auto-detect tilted horizons, then crop the empty corners or fill them, with a guide grid.

- URL: https://qilingtools.com/en/image/straighten
- Category: Image Tools (https://qilingtools.com/en/image)
- Tags: [Image](https://qilingtools.com/en/tags/image), [Photo Editing](https://qilingtools.com/en/tags/photo), [Scanning](https://qilingtools.com/en/tags/scan)
- Last updated: 2026-10-26
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

A slight tilt of the hand leaves horizons, sea lines, buildings and documents crooked. Rotate precisely by any angle down to 0.1°, or click Auto-detect tilt: the tool measures the direction of near-horizontal and near-vertical lines in the picture, works out the most likely tilt and corrects it in one go. Empty corners after rotating can be cropped away with the largest crop that keeps the original aspect ratio, or kept and filled with a colour or transparency. A guide grid on the preview helps alignment, and in a batch each image can be auto-corrected individually.

## How to use

1. Drop in tilted photos
2. Click Auto-detect tilt or fine-tune the angle with the slider, checking against the grid
3. Choose how to handle empty corners and click Straighten

## Features

- Rotate by any angle in 0.1° steps
- Auto-detects tilt from horizontal / vertical lines
- Crops empty corners, keeps aspect ratio
- Colour or transparent fill, per-image batch correction

## FAQ

### What if auto-detect gets it wrong?

Detection relies on straight lines. If a photo has no clear horizon, wall edges or lines of text, adjust by hand with the slider or the ±0.1° and ±1° buttons.

### How is this different from Rotate Image?

Rotate Image turns and flips by 90° or 180°. This tool corrects small tilts and can crop away the empty corners that rotating creates.

### Are my files uploaded?

No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.

### Do I need to sign up or pay?

No. The site is completely free, needs no account, has no usage limits and adds no watermark.

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