PNG compressor

Compress multiple PNG files without resizing. Choose color reduction, compare the original and result, and download each image locally in your browser.

Live preview

Zoom

Choose photos to see a live preview.

The comparison keeps original dimensions. The checkerboard reveals transparency; file size is measured from the actual output. Select any result in the list.

Images are processed on your device. Compressed copies omit original metadata. If the original is retained, its metadata is retained too. Download results before closing this page.

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What it does and when to use it

Reduce PNG file sizes for the web while keeping pixel dimensions and transparency. Process multiple images and decide after comparing each result with its original.

Prepare, compress and compare

Choose PNG files, select color reduction and start compression. Each image has its own status and download. Use Compare to inspect edges, text and gradients at 100% or 200%. You can cancel processing, remove a file or reset the selection.

What changes inside the PNG

The engine reduces the RGB palette and encodes the PNG without resizing. Decoded alpha samples are preserved, while color reduction can lose gradients. No-color-reduction mode retains browser-decoded colors; the browser interprets embedded color profiles. If the copy is not smaller, the original is returned. No percentage saving or target file size is guaranteed.

Practical example

Usage scenario

Input: PNG 1200 × 800 px; 64
Result: PNG 1200 × 800 px

Limits and checks

No. Pixel dimensions stay the same. Use Resize images when you need different dimensions.

Sources and further reading

W3C — Portable Network Graphics (PNG) Specification

Frequently asked questions

Is this lossless compression?

The 256- and 64-color modes remove color information. No-color-reduction mode does not quantize decoded colors, but re-encoding may change metadata and color handling. Always inspect the visual comparison.

Why was the original retained?

Some PNGs are already optimized or do not benefit from the selected settings. If the new copy is the same size or larger, the tool returns the original instead of claiming a saving.

PRACTICAL GUIDES

How to reduce photo file size

A photo can be large in pixel dimensions, file size or both. Start with the recipient’s limit, make a copy and compare the actual result. A smaller file is useful only if the details that matter are still clear.

Follow the steps

PNG compressor

Choose PNG files