Question 1

How do I add a blurhash placeholder to an image in Flutter?

Accepted Answer

Use the BlurHash widget in your widget tree with a hash string, and constrain its size using AspectRatio or SizedBox. The README provides example code for easy integration and smooth transitions to the actual image.

Question 2

flutter_blurhash vs shimmer effects for loading placeholders?

Accepted Answer

flutter_blurhash shows a blurred preview of the actual image, providing visual context, while shimmers are generic animations. BlurHash is better for user experience in image-heavy apps, but shimmers are simpler and require no external hash generation.

Question 3

Does flutter_blurhash work with image caching packages like cached_network_image?

Accepted Answer

Yes, you can use the BlurHash widget as a placeholder within cached_network_image's placeholder parameter. This combines efficient image caching with the smooth transition feature of flutter_blurhash for optimal performance.

Question 4

How to generate a blurhash string for my own images?

Accepted Answer

Upload your image to external sites like blurha.sh, as flutter_blurhash doesn't support encoding. Alternatively, use BlurHash encoding libraries in other languages and integrate the hash strings manually into your Flutter app.

Question 5

What's the performance difference between the optimization modes?

Accepted Answer

Approximation mode is fastest but produces darker placeholders, standard mode balances speed and accuracy, and none mode uses the original algorithm for compatibility. Choose based on your app's performance needs and visual standards.

Question 6

Can I use flutter_blurhash for Flutter web apps?

Accepted Answer

Yes, since it's a pure Dart implementation, it works across all Flutter platforms including web. Ensure your image loading strategy is optimized for web environments to avoid performance issues with large placeholders.

Question 7

Is there a way to encode blurhash in Flutter without external tools?

Accepted Answer

No, flutter_blurhash only decodes hashes; for encoding, you'll need to use separate packages or services. The README explicitly states this limitation, so plan for external dependencies in your workflow.

Blurhash

What is Blurhash?

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