Image tools that never upload your photos
Convert a picture between PNG, JPEG and WebP, shrink one that is too heavy to send, work out the dimensions a ratio needs — all done by your own browser.
The photo never leaves your computer
Every other image converter works the same way: you upload the file, a server does the work, and you download the result. That means your photo has been sat on someone else’s disk, and for a passport scan, a contract you photographed, a screenshot of an internal dashboard or a picture of your children, that is a genuinely bad trade for a file size. These tools use the image APIs already built into your browser — the picture is decoded, redrawn and re-encoded inside the tab, and the download you get back was produced on your own machine. You can disconnect from the network before converting and it still works, which is the only proof of that claim worth anything.
Which format to actually pick
PNG is lossless and keeps transparency, which makes it right for logos, icons, diagrams and screenshots of text — and wrong for photographs, where it produces files several times larger than they need to be. JPEG is lossy and has no transparency at all, so a transparent PNG saved as JPEG comes back with a solid background; it is the safe choice for photographs and for anywhere that has to accept an old format. WebP is lossy or lossless as needed, supports transparency, and is typically 25-35% smaller than the JPEG of equivalent quality, which makes it the default worth using on the web now that every current browser reads it.
Smaller files, and where the size actually goes
There are only two ways to make an image lighter, and they do different jobs. Resizing removes pixels, and it is almost always the bigger win: a 4000-pixel-wide photo displayed in a 800-pixel column is carrying twenty-five times more data than the screen can show. Lowering the quality keeps the pixels and throws away detail within them, which works well down to about 75% before the edges around text and flat colour start to visibly break up. Doing the resize first and the quality second usually gets a file under an email or upload limit with no visible loss at all. The image color extractor works the same way and never uploads either: it reads the pixels of a photo in the tab and hands back its dominant colors as hex values, which is the quickest route from a reference shot to a usable palette.
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