Cut the weight of a photo, screenshot or icon without spoiling how it looks.
File weight is the part of a picture nobody sees, and the part every visitor waits for.
A page with a few 3 MB photos loads slowly on mobile data and can hit the attachment limit of a contact form. The same images re-encoded with a sensible quality take a fraction of the time to arrive and still look identical at the size they are displayed.
Plenty of images are already as small as they can be — a screenshot straight out of a tool, a photo exported at 70% quality, an icon that was optimised years ago. When nothing can be saved, you get the original back untouched, and the result is flagged as already optimised. This tool never hands you a heavier file than the one you uploaded.
Keeping the original format is the default, so a JPG stays a JPG and a PNG stays a PNG and every program that opened the first file opens the result. If you want the extra saving that comes with WebP or AVIF, switch the output format; the opposite is there too, for when a tool only accepts JPG.
Three steps, and the defaults are a good start.
Drag it onto the box, click to browse, or paste it with Ctrl+V (Cmd+V on a Mac). PNG, JPG, WebP, AVIF, GIF, TIFF and SVG are accepted up to 25 MB, and the original stays untouched on your own device.
Quality 75 is the default and works for most photos. Lower it for more saving, raise it towards 90 for fine detail. The optional maximum width shrinks an oversized image before it is encoded, which is where the largest gains come from.
The preview shows the compressed image with the before and after weight and the percentage saved, so you can go back and lower the quality once more before saving. One click downloads the file, ready to replace the original.
The quality slider is only one lever, and it is not always the most effective one.
Quality runs from 1 to 100 and tells the encoder how much detail it may throw away. Down to about 75 the change is invisible on a photo, between 60 and 70 it shows in gradients and fine texture, and below 50 blocks and smearing appear around edges. Nudge it down in steps and watch the preview: the sweet spot is the lowest value that still looks clean at the size the image will be shown.
PNG is lossless, so there is no quality setting to turn down. What the tool reduces instead is the number of colours: the image is rebuilt on a palette that fits what it actually contains. Logos, icons, screenshots and flat illustrations often shrink to a fifth of their size with no visible change. A photograph has far too many tones for that trick to work well, which is why a photo is better saved as JPG or WebP.
A 4000 pixel photo shown at 900 pixels wide carries more than ten times the pixels anyone will see. Capping the width first, then encoding, beats any quality setting: the file gets smaller and the picture looks sharper on screen, because nothing has to be resampled by the browser. Compression works on the pixels that are there — the best first step is to remove the ones that are not needed.
It depends on how much room the original left: a phone photo exported at 100% quality often drops by 60–80%, while a file that was already optimised barely moves. The result line shows the percentage saved before you download, and lowering the quality or capping the width usually moves it further.
PNG has no quality dial — the only way to shrink it is to store fewer colours, which works beautifully for graphics and hardly at all for photographs. If a PNG stays heavy and it is a photo, save it as JPG or WebP instead: the same picture will be a small fraction of the size with no visible difference on screen.
A little, at some point — that is what the quality setting is for. Down to roughly 75 most photographs look unchanged, but sharp edges, small text and smooth gradients are the first things to suffer. Keep the original file, compare the preview, and stay at the highest value that gives you the saving you need.
Only if you ask. Leave the maximum width empty and the pixel dimensions stay exactly as they are. Fill it in and anything wider is scaled down to that width with the aspect ratio kept — images are never enlarged, so a width above the original simply does nothing.
One file per run keeps each image at full attention: the quality you choose applies to the file in front of you, and the preview shows exactly what that setting did. Download the result, click “Convert another”, and repeat. For a whole folder of similar photos, the settings that worked for the first one will work for the rest.
Files are processed on our server and not stored.
