Building a Browser-Based Image Blur Tool with Canvas API (No Libraries)

The provided code and explanation detail a web-based image blurring tool that operates entirely within the user's browser without any server-side processing. Here are the key components and functionalities of this application:

1. Drag-and-Drop File Handling:

   • The handleDragOver, handleDragLeave, and handleDrop functions manage drag-and-drop interactions.
   • When a file is dropped, it triggers the processFile function to handle the image upload.

2. Image Processing:

   • The processFile function reads the user-uploaded file using FileReader.readAsDataURL.
   • It creates an <img> element and sets its source to the data URL of the uploaded file.
   • Once the image is loaded, it updates the state with the blurred version by setting a CSS filter on the image.

3. Canvas Blurring:

   • The downloadBlurred function uses a canvas to create a blurred version of the image.
   • It sets up a canvas element and draws the original image onto it with an additional blur effect applied using ctx.filter = "blur(Xpx)".
   • The blurred image is then converted back into a data URL for download.

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