PNG is the go-to format for logos, icons, screenshots, and any graphic that needs transparency or pixel-perfect edges. The trade-off is size: because PNG is lossless, a full-color PNG can be five to ten times larger than the equivalent JPEG. This tool shrinks PNGs in your browser so pages load faster and uploads finish sooner — without sending your files anywhere.
Why PNG files get so big
PNG stores every pixel exactly, with no perceptual shortcuts. A photograph saved as PNG keeps millions of subtly different colors, and a 24-bit PNG also reserves space for a full alpha (transparency) channel. That precision is great for graphics with hard edges, but wasteful for anything photographic.
How PNG compression works here
- Color quantization: reducing a graphic that only uses a few dozen colors down to an optimized palette can cut size by 50–70% with no visible change.
- Smart re-encoding: the tool re-renders the image through an optimized pipeline that strips bulky metadata and redundant data.
- Transparency preserved: the alpha channel is kept intact, so transparent backgrounds stay transparent.
Tip: If your PNG is actually a photo (no transparency needed), converting it to WebP or JPEG will shrink it far more than PNG compression alone. The tool can convert formats in one step.
When to keep PNG — and when to switch
Keep PNG for logos, icons, line art, screenshots with text, and anything that needs a transparent background. Switch to JPEG or WebP for photographs and complex images where a tiny, invisible quality loss is an easy trade for a much smaller file. Our guide on the best image format for the web breaks down each case.
How to compress a PNG
Open the PNG compressor
Open the tool and drag your PNG files into the drop zone, or click to browse. Compression runs locally with the Canvas API, so files never leave your device.
Choose a compression level
Use the quality slider to balance size and clarity. For logos and UI graphics, 60–80% usually looks identical to the original.
Download your smaller PNG
Save the optimized file, or compress a whole folder and download everything as a single ZIP.
🔧 Try Compress Image — free, private, no upload
Drop your files and get smaller versions in seconds. Quality slider, format switching, and batch processing — all in your browser.
Open Compress Image →Frequently asked questions
Does compressing a PNG remove transparency?
No. The alpha channel is preserved, so transparent backgrounds stay transparent after compression.
How much smaller will my PNG get?
Graphics with limited colors (logos, icons, flat illustrations) often shrink 50–70%. Photographic PNGs shrink less — for those, converting to WebP or JPEG saves far more.
Are my PNG files uploaded to a server?
No. Compression runs entirely in your browser using the Canvas API. Your files never leave your device.
Is there a limit on how many PNGs I can compress?
Free users get a generous daily allowance and can batch-process multiple files at once. Pro removes the daily cap and raises the per-file size limit.