- #FILE SIZE REDUCER ONLINE JPG FULL#
- #FILE SIZE REDUCER ONLINE JPG VERIFICATION#
- #FILE SIZE REDUCER ONLINE JPG CODE#
One has to put everything inside img.onload.
#FILE SIZE REDUCER ONLINE JPG CODE#
This code looks far less scary than the other answers. I came up the solution after reading this chapter. Server doesn't have to decode anything.Ĭheck for all information. Make a new File object inside the callbackfunction body with let compressedImageBlob = new File().Īdd new hidden inputs or send via javascript. The following script deals with both points: // From, needed for Safari: the file -> image -> canvas -> file conversion loses EXIF data in particular, data about image rotation commonly set by modern phones/tablets.canvas.toBlob (when available) is more performant than canvas.toDataURL, and also async.I see two things missing from the other answers: What do you think ? Do you have any advice to tell me ? Do you know any way to compress an image browser-side in JavaScript ? Thanks for your replies. I have no idea what would be the compression ratio for this technique. So, I could resize the image to fit those dimensions, thus reducing file size. But, I know that uploaded images are going to be displayed on my website, every time at the same place, and I know the dimension of this display area (eg. File reading locally is possible via File API, image previewing and editing could be done using Canvas element, but I can't find a way to do the image compression part.Īccording to and, supporting those browser is quite hard (thanks to IE), but could be done using polyfill such as FlashCanvas and FileReader.Īctually, the goal is to reduce file size, so I see image compression as a solution. I've not code anything right now, but I've thought about it already. If possible, only JavaScript should be used (but I'm pretty sure this is not possible).
#FILE SIZE REDUCER ONLINE JPG FULL#
The full process up to the last step should be done client side, and should be compatible on latest Chrome and Firefox, Safari 5+ and IE 8+. the user click on the "Finish" button, then the form containing datas + compressed image is sent to the server (without AJAX),.the user fill a form with data like name, age etc,.when the user is satisfied, the edited image is then compressed and "saved" locally (not saved to a file, but in the browser memory/page),.the user can do some basic operations such as rotate the image by 90°/-90°, crop it following a pre-defined ratio, etc, or the user can upload another image and return to step 1,.if every thing is OK, a preview of the image is displayed on the page,.