ONELESS · IMAGE LIGHT
PNG is useful for screenshots, diagrams, lettering, and transparent graphics, but not every PNG stores those pixels equally efficiently. Compress PNG tries a different lossless encoding of the image decoded by your browser. It keeps the displayed dimensions and alpha values, compares the actual byte sizes, and gives you a separate result. There is no misleading JPEG-style quality slider and no hidden reduction in the number of colors.
Open Compress PNG · This tool needs JavaScript for image processing. The complete guide is available below.
UNDERSTAND THE RESULT
The optimizer filters rows before DEFLATE compression. This can represent repeated patterns and neighboring pixels more compactly without intentionally changing their decoded 8-bit RGBA values. It does not resize, quantize colors, sharpen, or remove the background.
Opaque, partly transparent, and fully transparent pixels remain in the PNG output. The checkerboard is a preview aid and is not included in the downloaded file. Inspect translucent edges as well as large clear areas.
The preserved pixels are the browser’s decoded canvas pixels. A 16-bit source, embedded profile, or unusual color space can change during browser decoding. This is not a byte-for-byte archival optimizer, and original metadata is not copied. Keep the original for color-critical work.
HOW TO USE IT
EVERYDAY USES
Try lossless storage optimization when small lettering and sharp edges matter. Check the measured size rather than assuming that every screenshot will shrink.
Keep a PNG’s alpha channel when the same graphic must sit on light, dark, or colored pages. No opaque background is added by this optimizer.
Prepare a separate copy without changing the diagram’s displayed dimensions. If the document also requires fewer pixels, use Image Resizer before optimizing that resized copy.
YOUR IMAGE, YOUR DEVICE
The selected image is read and processed in this browser. This tool does not upload the file to a server or save it in browser storage. Choosing another file or leaving the tool releases its working images. Downloaded copies remain wherever your browser saves them.
Every change starts from the original image in memory. Export creates a new raster file; original EXIF, camera information, and embedded profile metadata are not copied. Browser decoding and color management can affect the result, so keep your original for archival work.
This release handles one file at a time, up to 25 MB, 16 megapixels, and 16,384 pixels on either side. Animated images are rejected rather than flattened to one frame. Browser encoding support can vary. A failed export shows an error and never leaves an outdated result ready to download. Read the site privacy policy for the surrounding website.
File sizes and limits use decimal units: 1 KB = 1,000 bytes and 1 MB = 1,000,000 bytes. Rounded labels are for readability; target checks compare exact bytes.
KEEP IT NEARBY
Bookmark this page with Ctrl + D on Windows or Command + D on a Mac. To make a desktop shortcut, use your browser’s shortcut or Add to Home Screen option when available. The shortcut opens the tool page; it does not include your image or settings.
Download a PNG or ICO if your device lets you customize shortcut icons.
QUESTIONS, ANSWERED
No. There is no palette reduction or quality slider. It losslessly encodes the decoded 8-bit RGBA canvas. Browser decoding and color management still apply.
The source may already use a compact palette, stronger compression, or a more suitable encoding. This optimizer uses RGBA rows and may not beat it. Both sizes are measured and a larger result is labelled honestly.
This tool does not resize or target a byte ceiling. Use Resize Image to KB if you can accept smaller dimensions to meet a limit.
No. Animated PNG is detected and rejected to avoid silently dropping frames. Select a still PNG for this release.
No. The output is a new raster made from browser-decoded pixels. It does not copy original EXIF, text chunks, or embedded profiles. Keep the original if those fields matter.
The optimizer requires the CompressionStream API in addition to image decoding. If the current browser cannot perform the operation, it shows an error instead of presenting an unchanged file as a successful optimization.
ANOTHER SMALL TASK?
Optimize PNG storage while keeping decoded pixels and transparent edges.
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