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Compress PNG to 100KB Online Free — Shrink Screenshots, Logos & Graphics
PNG is a lossless format: it keeps every pixel exactly as it was, and pays for that accuracy in file size. A full-screen screenshot or a detailed graphic can easily run to several hundred KB or a few MB. Compress PNG to 100KB reduces those files to 100KB or under, so they're light enough for documents, help centers, email, and web pages.
The reason PNGs get so big is that photographs and gradients contain millions of slightly different colors that don't pack tightly when nothing is discarded. Flat-color graphics compress well as PNG, but a photo saved as PNG is often several times larger than the same picture saved as a JPEG. Converting and compressing in one step is where the biggest savings come from.
It's the right tool for screenshots in bug reports and tutorials, logos and UI mockups, charts, infographics, and anything else you exported as PNG and now need lighter. For the best result, crop the screenshot to the relevant area first, because removing pixels you don't need saves more space than any other adjustment.
One thing to know: the result is a standard JPEG, and JPEG doesn't support transparency, so transparent areas become a solid white background. Everything is processed inside your browser, so your screenshots and designs are never uploaded to a server, and there's no sign-up or watermark.
Common questions
- How do I compress a PNG to 100KB?
- Upload your PNG, and the tool reduces it to 100KB or under by adjusting the pixel dimensions and compression together. Check the size shown in the preview, then download the result.
- Why is my PNG file so large?
- PNG stores exact pixel data without discarding anything. Photos, gradients, and full-screen screenshots contain a huge number of distinct colors and pixels, which makes the file heavy compared with lossy formats.
- What happens to the transparent background of my PNG?
- It becomes solid white. The tool outputs a standard JPEG, which has no transparency. That's fine for screenshots and documents, but not for a graphic that needs to overlay other content.
- Will my file still be a PNG after compressing?
- No, it downloads as a JPEG. It works anywhere images are accepted, but simply renaming the extension to .png doesn't turn it back into a real PNG, so don't do that if a site checks the format.
- What's the best way to get a PNG screenshot under 100KB?
- Crop out everything you don't need, then compress. If the screenshot is very large, such as a full 4K display capture, reducing its dimensions before compressing also helps considerably.
- Will screenshot text stay readable at 100KB?
- Normally yes, especially after cropping. If small text looks soft in the preview, try capturing a smaller area at a larger zoom level, or use a higher target size such as the 200KB image tool.
- Can I compress a PNG logo to 100KB?
- Yes. Flat logos with few colors do very well. Remember the background will be white, and for very small logos and icons the 10KB image tool is a better match.
- Is a photo saved as PNG worth compressing?
- Absolutely. That's where the savings are largest, because photos are stored inefficiently as PNG. A photo that's several megabytes as a PNG will often shrink dramatically while still looking natural.
- Is it safe to compress private screenshots here?
- Yes. Compression happens locally in your browser session, so screenshots and designs aren't uploaded to or stored on a server.
- I have a JPG instead of a PNG. Which tool should I use?
- Use the Compress JPEG to 100KB tool for JPEG photos and documents, or the general Compress Image to 100KB tool if you have a mix of formats.