CrunchyPic

Compress PNG Online Free

Shrink PNG images to your target size with an honest lossless engine — and see exactly what the same image would weigh as a JPG.

🔒 Your images never leave your device — 100% private, no uploads.

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Why PNG files are so big

PNG is a lossless format: it stores every single pixel exactly as drawn, with no approximations. That precision is wonderful for sharp graphics, but it is expensive. A photograph contains millions of subtly different colors — sensor noise, film grain, soft gradients, tiny shadows — and lossless compression has to preserve all of that noise faithfully. The result is that a photographic PNG routinely weighs 5–10× more than a JPG of the same image that looks identical to your eyes. Even a simple screenshot can balloon: a 1920×1080 capture holds over two million pixels, and PNG stores each one. So when your PNG will not shrink, it is not broken — it is doing exactly what the format was designed to do.

The lossless limit: what compression can't do

Here is the honest part most compressor sites skip: you cannot dramatically shrink a PNG without changing its pixels. Lossless re-encoding — stripping metadata, using better filters and deflate settings — typically saves 5–15%, and this tool does exactly that first. Beyond that, the math is unforgiving: the only levers left are fewer pixels (smaller dimensions) or fewer colors. If your PNG still exceeds the target after re-encoding, this tool shrinks the dimensions in 10% steps, never below 320 pixels wide, until it fits — and it tells you the final dimensions plainly. Any site promising to "compress PNG 90% with no quality loss" is either resizing your image silently or being dishonest. We would rather show you the real numbers, including the JPG comparison below every result.

PNG-8 vs PNG-24: pick the right flavor

Not all PNGs are the same. PNG-24 stores 16.7 million colors plus a full transparency channel — it is what your screenshot tool or design app exports by default. PNG-8 stores only 256 colors, like a classic GIF, and for the right artwork it is dramatically smaller: a two-color logo or a flat icon can drop from 200KB as PNG-24 to 20KB as PNG-8 with no visible change. The catch is gradients and photos: squeeze those into 256 colors and you get ugly banding. The rule of thumb is simple — flat graphics, logos, icons, and pixel art are PNG-8 candidates; anything with gradients, shadows, or photographic detail needs PNG-24. Most export dialogs (Figma, Photoshop, Illustrator) offer both; choosing PNG-8 at export time often beats any after-the-fact compression.

When to switch to JPG or WebP

Sometimes the right move is not compressing the PNG harder — it is leaving PNG behind. If your image is a photograph, a detailed illustration, or anything without transparency, JPG at 80% quality will look the same at a fraction of the size. That is why every result on this page includes a live measurement: the tool encodes your exact pixels as a JPG and reports the real size, so you can see the trade-off instead of guessing. WebP goes further still, beating both formats for photos and graphics alike, though a few older systems still stumble on it. Keep PNG for what it is best at — transparency, razor-sharp text, and graphics with flat colors — and let JPG or WebP carry your photos. Your visitors' loading times will thank you.

Frequently asked questions

Why didn't my PNG get much smaller?

PNG is a lossless format, so every pixel is stored exactly — there is simply less redundancy to remove than in a JPG. Re-encoding cleans up inefficient encoding and metadata, which typically saves 5–15%, but dramatic savings require fewer pixels (resizing) or a lossy format. The tool tells you honestly how much was saved and shows what the same image would weigh as a JPG.

What does 'Same image as JPG would be ~X KB' mean?

After compressing, the tool encodes the exact same pixels as a JPG at 80% quality and reports that file size. It is a real measurement, not an estimate. For photos it is often 5–10× smaller than the PNG, which tells you immediately whether switching formats is worth it.

Will compression change how my PNG looks?

No — as long as dimensions stay the same, PNG compression is lossless and every pixel is identical to the original. If the file still exceeds your target, the tool shrinks the dimensions in 10% steps (never below 320px wide), and that resize is the only step that can change appearance.

Does this tool keep transparency?

Yes. The PNG is re-encoded on a transparent canvas, so transparent and semi-transparent areas are preserved exactly, unlike JPG conversion which would flatten them onto a background color.

Should I use PNG or JPG for my website?

Use PNG for logos, icons, screenshots, and graphics with sharp edges or transparency. Use JPG (or WebP) for photographs and complex images — a photographic PNG can easily be ten times larger than a JPG that looks identical. When in doubt, check the tool's JPG comparison line.

Are my PNG images uploaded anywhere?

Never. Compression happens entirely in your browser: your file is decoded locally, re-encoded, and offered back as a download. Nothing leaves your device, and the page works offline once it has loaded.