Make an image fit under an exact size

When you are given a maximum size, not a quality setting

Ordinary compressors ask the question backwards: they hand you a quality slider from 1 to 100 and leave you guessing. But when a form tells you "the photo must not exceed 500 KB", quality is not what you care about — hitting that number on the first try is. This tool starts from the limit and works backwards.

How it finds the sweet spot

Internally it runs a binary search: it tries a middle quality, checks how large the result is, and moves up or down depending on whether it overshot. Seven attempts narrow it down to about 1%, so what you download is the best possible image that fits under your limit, not something crushed at random.

If even the lowest sensible quality will not fit — common with modern phone photos and a 100 KB limit — it then reduces the pixel dimensions by 15% and tries again. Losing pixels is usually far less visible than destroying the compression, and we always tell you when it was necessary.

Which format to pick

Automatic decides for you: JPG for photographs, which is what every government portal and upload form accepts; PNG if the original was one, so transparency survives. Where the destination allows it, WebP reaches the same look at noticeably less weight, and is the best choice when the limit is tight. AVIF squeezes even harder, but some programs still cannot open it.

A detail almost nobody gets right

If your image already fits, this tool leaves it alone. Re-compressing a JPG that was already small enough only damages it further: every pass stacks new losses on the previous ones. When that happens we say so and hand you back the untouched original.

Several images at once

Drop as many as you need and they are processed one after another, each with its own result. That is the normal case when preparing a batch of photos for a listing, a file or a gallery — and precisely what most free tools will not let you do without paying.