PNG Size Reducer
Shrink a large PNG down to a much smaller file size, entirely in your browser.
Reduce PNG File Size Online
PNG files — especially screenshots and scanned images — can be surprisingly large because PNG compression doesn't shrink photographic detail the way JPEG does. This tool reduces a PNG's file size by re-encoding it as an optimized JPEG, which is far more effective for photos and screenshots that don't need transparency.
How to Reduce a PNG's Size
- Upload your PNG — Click Upload Image or drag a PNG file into the box above.
- Pick a compression method — Use the quality slider, or "Compress to Size" for an exact KB target.
- Compress the image — The tool re-encodes it as an optimized JPEG at the right quality level.
- Download the result — Check the new (usually much smaller) file size, then download it.
Why Reduce a PNG's File Size?
PNG is a lossless format, which is great for graphics and text but means photos and screenshots saved as PNG are often 3-10x larger than they need to be. Reducing PNG size helps with:
- Uploading screenshots to forms or support tickets that reject large files.
- Emailing scanned documents saved as PNG by a scanning app.
- Speeding up a website that's using PNG for photos instead of JPEG.
Keeping the PNG Format Instead
If you specifically need the output to remain a PNG (for example, a logo with a transparent background), use Convert Image to control the output format, and Resize Image to bring down file size by reducing dimensions instead of re-encoding as JPEG.
Frequently asked questions
Does this keep my file as a PNG?
No — to genuinely shrink the file size, it's re-encoded as an optimized JPEG. If you need the output to stay a PNG, use Convert Image and choose PNG as the output, then reduce the dimensions with Resize Image to bring the file size down instead.
Will this remove transparency?
Yes. JPEG doesn't support transparency, so any transparent areas in your PNG will be filled in (typically white) during compression. Don't use this tool on logos or graphics that rely on a transparent background.
What kind of PNGs work well with this tool?
Screenshots, scanned documents, and photos that were saved as PNG without needing transparency — these often shrink dramatically when re-encoded as JPEG.
Can I target an exact KB size?
Yes — switch to "Compress to Size" in the tool and enter a KB target, such as 100KB or 200KB.
Is my file uploaded anywhere?
No, all processing happens locally in your browser using the Canvas API — your file is never uploaded to a server.