Drupal 8: Get Image URL / URI with Image Style

get_image_path_with_image_style.php

<?php
use Drupal\file\Entity\File;
use Drupal\image\Entity\ImageStyle;
// File ID.
$fid = 123;
// Load file.
$file = File::load($fid);
// Get origin image URI.
$image_uri = $file->getFileUri();
// Load image style "thumbnail".
$style = ImageStyle::load('thumbnail');
// Get URI.
$uri = $style->buildUri($image_uri);
// Get URL.
$url = $style->buildUrl($image_uri);

Thank you this is great and pointed me in the right direction. I had to use the file_create_url function however to get the correct URL (D9.2.9)

// ...

// Load image style "thumbnail".
$style = ImageStyle::load('thumbnail');
// Get URI.
$uri = $style->buildUri($image_uri);
// Get URL.
$url = file_create_url($image_uri);

And then I wanted the relative path instead of the URL so:

$url = parse_url($url)['path'];

don't use file_create_url , it's deprecated , use \Drupal::service('file_url_generator') instead

See https://www.drupal.org/node/2940031 for additional examples.

cool!