Image resize before upload

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I need to provide a means for a user to upload photos to their web site in jpeg format. However, the photos are very large in original size, and I would like to make the resize before upload option very effortless for the user. It seems my only options are a client side application that resizes the photos before uploading them via a web service, or a client side JavaScript hook on the upload operation that resizes the images. The second option is very tentative because I don't have a JavaScript image resizing library, and it will be difficult to get the JavaScript to run my current resize tool, ImageMagick.

I'm sure this is not too uncommon a scenario, and some suggestions or pointers to sites that do this will be appreciated.

You have several options:

  1. Java
  2. ActiveX (only on windows)
  3. Silverlight
  4. Flash
  5. Flex
  6. Google Gears (the most recent version is capable of resizing and drag and drop from your desktop)

I've done a lot of research looking for a similar solution to what you have described and there a lot of solutions out there that vary a lot in quality and flexibility.

My suggestion is find a solution which will do 80% of what you need and customize it to suit your needs.

client side image resize before upload jquery, <!doctype html> <html> <head> <meta content="text/html; charset=UTF-8" http-​equiv="Content-Type" /> <title>client side image resize before upload  The best free online image resizer and compressor on the Web, crop, resize and optimize your images was never easier. Crop and resize any image to the exact pixels or proportion you specified and reduce the file size significantly without losing quality for FREE, without Photoshop.

In 2011, we can know do it with the File API, and canvas. This works for now only in firefox and chrome. Here is an example :

var file = YOUR_FILE,
    fileType = file.type,
    reader = new FileReader();

reader.onloadend = function() {
  var image = new Image();
      image.src = reader.result;

  image.onload = function() {
    var maxWidth = 960,
        maxHeight = 960,
        imageWidth = image.width,
        imageHeight = image.height;

    if (imageWidth > imageHeight) {
      if (imageWidth > maxWidth) {
        imageHeight *= maxWidth / imageWidth;
        imageWidth = maxWidth;
      }
    }
    else {
      if (imageHeight > maxHeight) {
        imageWidth *= maxHeight / imageHeight;
        imageHeight = maxHeight;
      }
    }

    var canvas = document.createElement('canvas');
    canvas.width = imageWidth;
    canvas.height = imageHeight;

    var ctx = canvas.getContext("2d");
    ctx.drawImage(this, 0, 0, imageWidth, imageHeight);

    // The resized file ready for upload
    var finalFile = canvas.toDataURL(fileType);
  }
}

reader.readAsDataURL(file);

Compress, resize and manage images using JavaScript directly , You might be working on a project which has an image upload feature that takes images from the user and uploads it to your storage server. If you are uploading the large image file in the server then it will take up extra spaces of the storage. Then why don’t we resize image before upload. So, that it will reduce image size and will occupy less storage. If the webpage contains the low size image, then it will load fast in the webserver.

There is multiple-technology-capable Plupload tool which declares that it can do resizing before upload, but I haven't tried it yet. I have also find a suitable answer in my question about binary image handling javascript libs.

Optimize images before uploading? - feature, Is it possible to pre-resize an image BEFORE uploading to server? If the max image size is set to 2M, and user trying to upload a photo (usually >4M), he will  Use HTML5 to resize an image before upload. Ask Question Asked 5 years, 10 months ago. Active 1 year, 3 months ago. HTML5 Pre-resize images before uploading. 807.

I think you need Java or ActiveX for that. For example Thin Image Upload

Image Resize - Real Uploader, Resize images before uploading on server or after​​ Real Uploader can resize JPEG and PNG images before upload them on server, resize them directly on the user browser. The image resize is implemented using the PICA library, very fast and with very high quality. how would i resize the image before or during the upload? php resize image on or before upload. Ask Question Asked 7 years, 4 months ago. Active yesterday.

What jao and russau say is true. The reason being is JavaScript does not have access to the local filesystem due to security reasons. If JavaScript could "see" your image files, it could see any file, and that is dangerous.

You need an application-level control to be able to do this, and that means Flash, Java or Active-X.

Resize images client-side with HTML5 before uploading with , Resize images on client-side before uploading them with the RadAsyncUpload control. SOLUTION. Being able to intercept the uploading process  You simply browse go to www.simpleimageresizer.com and upload the images you want to shrink. The file formats supported by Simple Image Resizer include JPEG, JPG, PNG, BMP and GIF. You can use Simple Image Resizer to resize photos and images online, on a variety of different situations, for example: publishing images on your website to make

How to resize Image before Upload in Browser, In this tutorial I would like to show you how to implement an image upload script in which the image is resized or minimized automatically. Most image viewing programs have a built-in feature to help you change the size of images. Here are our favorite image resizing tools for Windows. We’ve picked out a built-in option, a couple of third party apps, and even a browser-based tool.

HTML5: resize a photo before upload, It's possible to resize the image BEFORE the upload?” Yes, it's possible! HTML5. Using the File API, and processing the images with the canvas  The theory is that you can use canvas to resize the images on the client before uploading. The prototype example seems to work only in recent browsers, interesting idea though However, I’m not sure about using canvas to compress images, but you can certainly resize them.

reference, [This thread is closed.] Is it possible to resize the image before uploading, since phone camera images are so large these days? I was hoping to use… Cropping image before upload, always a great idea for server space optimization. Crop feature helps to resize the image as per the required size. You can also reduce the web page size and load time by showing the exact size image. If your web application has image upload functionality, image crop and resize are very useful.

Comments
  • Yes, my suggestion of google gears was made prior to the removal (note the date of my answer).
  • @digitalsanctum any change 5 years after ?
  • As of 2011, it can be done natively. See the answer below: stackoverflow.com/a/8397789/1689770
  • how would you make a proper ajax post request with the file appearing as it would with a regular form? I want to make the change transparent to the rest of my application.
  • I've write a blog post (in french) about it. Here is it translated by google: translate.google.fr/…
  • I know this is a bit old, but should the 5th line from the bottom be var file = canvas.toDataURL(fileType); ? Otherwise, finalFile is just kinda set and forgotten.
  • Well once you've got your finalFile you should upload it (by passing finalFile to an upload function). This part is not shown there since the question was about how to resize an image.