How to reduce an image's file size
Upload a photo or graphic, then choose a method. By quality lets you set a level from 10 to 100 percent and see the new file size right away. Target size lets you pick a limit such as 100 KB or 1 MB, and the tool finds the highest quality that still fits.
With a target size, the compressor only lowers quality first. If even the lowest quality setting is too big, it reduces the pixel dimensions in small steps until the file fits, and the status line tells you the dimensions were reduced. The original and compressed sizes and dimensions are shown side by side, so you always know what changed.
Which output format gives the smallest file?
JPG is the safe choice for photos. Every device, browser and upload form accepts it. WebP usually produces a noticeably smaller file at the same visual quality and keeps transparency, which makes it a good fit for websites. PNG is lossless: it keeps every pixel exactly, so it suits logos, screenshots and graphics with flat color, but it is rarely the smallest option for a photo.
The output format starts as the format you uploaded. HEIC, TIFF, BMP and other formats start as JPG. You can switch to JPG, WebP or PNG at any time and the preview updates. Target sizes and the quality slider apply to JPG and WebP only. PNG compression is lossless and cannot trade quality for size, so choosing PNG hides those controls and simply optimizes the file.
What quality setting should you use?
The default of 75 percent is a good balance for most photos. Between 60 and 80 percent the difference from the original is hard to see at normal viewing size, while the file is often a fraction of the original. Below about 50 percent you may notice soft detail, banding in skies and blocky edges around text.
Screenshots and images with fine text need a higher setting than photos, or a switch to PNG. Drag the compare slider across areas with sharp edges and faces before you download.