fast_image_resizer

Package Overview

Package selection guidance compiled from public package information, community data, and project usage.

Fast Image Resizer is a Flutter package that enables efficient image resizing using native implementations across multiple platforms. It specializes in high-performance scaling of images with minimal overhead, delivering optimized results. The package supports only PNG output format, making it ideal for applications requiring compressed, high-quality PNGs. Built for speed and reliability, it integrates seamlessly into apps focused on multimedia editing, compression, or image processing workflows. Its cross-platform compatibility ensures consistent behavior on Android, iOS, Web, macOS, Windows, and Linux.

Use cases

Image thumbnail generation
Optimizing images for web delivery
Reducing image file size for storage
Preprocessing images for app display
Batch image resizing in media apps

Key features

Native performance on all platforms
PNG-only output format
Cross-platform compatibility
Minimal memory usage
Simple API for resizing
Fast execution with low latency

Suitable for

Apps needing fast image processing
Developers prioritizing performance
Projects focused on PNG output
Media-heavy applications
Web and mobile apps requiring image optimization

Considerations

Only outputs PNG files
Limited to resizing operations
No support for other image formats
Requires careful handling of large images
Not suitable for complex image transformations

Original README

Original README snapshot from the linked source repository. Visit the repository for the latest content.

This package uses native implementations to resize an image. It should be fast compared to the image package. It only supports PNG as output at the moment.

This package has zero dependencies.

Features

Supported inputs: JPEG, PNG, GIF, Animated GIF, WebP, Animated WebP, BMP, and WBMP
Supported outputs: PNG

Getting started

Add fast_image_resizer to your pubspec.yaml

Usage

import 'package:fast_image_resizer/fast_image_resizer.dart';
import 'dart:typed_data';

final rawImage = await rootBundle.load('assets/someImage.png');
final bytes = await resizeImage(Uint8List.view(rawImage.buffer), width: 150);
if (bytes != null) {
    final imageWidget = Image.memory(Uint8List.view(bytes.buffer));
    showDialog(
        context: context,
        builder: (BuildContext context) {
            return AlertDialog(
            title: const Text("Image"),
            content: imageWidget,
            );
        }
    );
}

final ImagePicker _picker = ImagePicker();
final XFile? image =
    await _picker.pickImage(source: ImageSource.gallery);
if (image != null) {
    final rawImage = await image.readAsBytes();
    final bytes = await resizeImage(Uint8List.view(rawImage.buffer), height: 250);
    if (bytes != null) {
        final testing = Image.memory(Uint8List.view(bytes.buffer));
        showDialog(
            context: context,
            builder: (BuildContext context) {
                return AlertDialog(
                    title: Text("Image"),
                    content: testing,
                );
            }
        );
    }
}

Known Issues

This currently does not work on web, because of this issue: https://github.com/flutter/flutter/issues/34075

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