Compress PNG to 100 KB
PNGs are lossless, so hitting a size limit works differently: this tool scales your PNG down until it fits under 100 KB while preserving transparency. Need it even smaller with no dimension loss? Switch the output to WebP — it keeps transparency too and compresses far better.
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JPG · PNG · WebP · GIF · BMP · AVIF — processed locally, never uploaded
≤ 100 KB
Why PNG behaves differently
PNG is a lossless format — there's no quality slider to turn down, because it's designed to reproduce every pixel exactly. That's perfect for screenshots, logos, diagrams, and anything with sharp edges or transparency, but it means the only reliable way to shrink a PNG under a hard limit is to reduce its pixel dimensions.
This tool automates that: it scales the image down step by step until it fits under 100 KB, while keeping the transparent background intact. Flat graphics with few colours shrink easily; detailed screenshots with lots of color variation are the hardest to squeeze.
When to switch this PNG to WebP instead
If you need the file smaller without losing dimensions — or the PNG just won't fit at the size you need — switch the output to WebP. WebP supports transparency just like PNG but compresses dramatically better, often producing a file a fraction of the size at the same dimensions.
Stick with PNG only when the destination specifically requires a .png file. For everything else, WebP will usually give you a smaller, sharper result. JPEG is the one format to avoid here, since it can't store transparency and will flatten it onto a white background.
Other target sizes
Frequently asked questions
Will my PNG keep its transparency?
Yes — both PNG and WebP output preserve transparent backgrounds. Only JPEG flattens transparency onto white.
Why does PNG compression reduce dimensions instead of quality?
PNG is a lossless format — there's no quality dial to turn. The reliable way to shrink a PNG below a hard limit is reducing its pixel dimensions, which is what this tool automates.
Is my image uploaded to a server?
No. Compression happens entirely in your browser using the Canvas API — your image never leaves your device, which is also why it's instant.
What if my image can't reach 100 KB?
The tool first lowers the compression quality, and if that's not enough it gradually reduces the dimensions until the file fits under 100 KB. Extremely detailed images may lose visible quality at very small targets — the preview shows you exactly what you'll get.
Is this free? Is there a watermark?
Completely free, no watermark, no sign-up, no file limit. The site is supported by ads.