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Straightening a photo

Level a leaning horizon with the Straighten slider, then keep exactly the part you want.

A horizon that leans, a building that tips over, a page photographed at an angle: Straighten turns the photo until it is level, then you keep exactly the part you want.

STRAIGHTEN A CROOKED PHOTO 01 Crooked The horizon leans; the grid shows by how much. 02 Slide to level Half a degree a step. No empty corners. 03 Apply Move or resize the box first, then Apply.
STRAIGHTEN A CROOKED PHOTO 01 Crooked The horizon leans; the grid shows by how much. 02 Slide to level Half a degree a step. The box never shows an empty corner. 03 Apply Move or resize the box first, then Apply.

Figure 1 — turn the photo until the grid lines up with the horizon, place the box, then Apply.

01 · Where it is
  1. Open a photo full screen, tap it to show its actions, then tap Edit.
  2. The editor opens on Crop. The Straighten slider is under the photo, with the angle next to it.
02 · Turning the photo
  • Slide right to turn the photo clockwise, left to turn it the other way, up to 45 degrees either side.
  • Every step is half a degree, so small leans are easy to fix. The angle shows as you slide, for example 2.5°.
  • The phone gives a short tick when you pass level, at 0°.
  • While the photo is turned, a dense grid fills the crop box. Line the horizon, a wall or the edge of a table up with it.
  • The crop box shrinks to the largest box that has no empty corner, so nothing blank from the turn ever ends up in the photo.
03 · Keeping the part you want
  • Drag inside the box to move it up, down, left or right over the turned photo.
  • Drag an edge or a corner to make the box taller, wider or smaller.
  • The box goes as far as the photo goes. It stops where one of its corners would leave the photo; the other directions still move.
04 · Apply, Reset and Undo
Apply

Turns and crops the photo in one step.

Reset

Back to 0° and the whole photo.

Undo

At the top of the editor: takes the straightening back after you applied it.

A quarter turn, for a photo lying on its side, is the Rotate tool. Nothing is written to your photo until you save.

The photo editor

Opensolr Photos is open source and MIT licensed. Questions about your Opensolr account, index or plan go to opensolr.com/contact; questions about the app itself belong on GitHub.

Opensolr Photos Documentation