Image Compressor changes the picture you already have
Shrink a photo before you email it or drop it into a page.
You pick a quality level and the browser re-saves the image. Lower quality means a smaller file and more softness.
What Image Compressor cannot recover
PNG screenshots of text do not shrink the way photos do. For a hard kilobyte cap, use Image to 100 KB or the size that matches the form.
Image Compressor without the extra promises
Image Compressor sits on this site because Image and Image are not interchangeable, even when they look similar in a file list. Shrink a photo before you email it or drop it into a page. Resize, crop, rotate, compress, or change a photo when the next form has rules. Resize, crop, rotate, compress, or change a photo when the next form has rules.
You pick a quality level and the browser re-saves the image. Lower quality means a smaller file and more softness.
Read this about Image before you upload
Image tools redraw the picture in your browser. They do not upload the file. These tools do not recover detail the camera never captured. Upscale and HD modes enlarge pixels. They are not AI reconstruction.
Keep the original photo.
Read this about Image before you send the download
Image Compressor keeps the format family as Image and still changes the file you can use. Resize, crop, rotate, compress, or change a photo when the next form has rules. The original pixels are what you have to work with. The edit is local.
Compress from the best original, once. A second lossy save softens detail that is already gone.
Keep, check, then delete
People lose time when they convert before they know which rule failed. Size, pixel dimensions, codec, font encoding, and layout are different rules. Image Compressor only addresses the Image to Image step. Shrink a photo before you email it or drop it into a page. You pick a quality level and the browser re-saves the image. Lower quality means a smaller file and more softness. PNG screenshots of text do not shrink the way photos do. For a hard kilobyte cap, use Image to 100 KB or the size that matches the form. The file stays in your browser and is not uploaded. The limit is 100 MB. Keep the original until the download has been opened in the program that will use it. Do the test with a short or simple file first when the real file is large. A one-page PDF, a single photo, or a one-minute clip will show you whether the output is the kind of file you needed. After that test looks right, run the real file once. Keep both the Image original and the Image download until the receiving person or the upload form accepts it. Photos fail uploads for three separate reasons: the format name, the pixel size, and the kilobyte size. Image Compressor only does the Image to Image step. If the form also prints a pixel size or a 20 KB or 50 KB cap, do that step with the matching tool, starting from the original each time. A second lossy save will not recover detail.
Here is the decision for Image Compressor. You start with Image and you stop when a real program accepts Image. The original pixels are what you have to work with. The edit is local. These tools do not recover detail the camera never captured. Upscale and HD modes enlarge pixels. They are not AI reconstruction. If those two sentences describe a tradeoff you do not want, do not convert. Renaming the extension by hand will not do this job. Running the tool twice on its own output will not do it either.
PNG screenshots of text do not shrink the way photos do. For a hard kilobyte cap, use Image to 100 KB or the size that matches the form.
A related step, if you still need one, is Image Resizer.
Other jobs start from the homepage, where each tool is named for the conversion it actually does.