PNG compression

Compress PNG Images

Reduce PNG file size without touching a single pixel — metadata and redundant data are optimized locally, in bulk.

Free · No limits Lossless re-pack Transparency kept Batch + folders Nothing uploaded

Failed to load resources

The image engine could not be loaded, possibly due to a network hiccup or an app update. Refresh the page and try again — your files stay on your device and are never uploaded.

Drop images here, or click to choose

Add multiple images at once, choose an entire folder, or just Ctrl+V to paste from your clipboard. Processing starts automatically with the current settings. Every operation runs in your browser.

JPG PNG WebP AVIF Batch processing

/ Before After Saving %

Output settings

Output format

Image quality

Applies to JPEG, WebP and AVIF. 75%–90% is usually a good balance.

PNG is lossless and has no quality slider. Converting photos to PNG may make them larger.

Max file size

Resize

Max width Max height

New settings apply to the whole batch only after you click here.

Images are decoded and re-encoded only in your browser. Nothing is uploaded.

Formats: JPG PNG WebP AVIF
Engines: MozJPEG · OxiPNG · libavif
Privacy: 100% local
Batch: Folders / paste

Free · Online · No file-count limit · No sign-up

What "compressing PNG" actually means

PNG is a lossless format: every pixel must be preserved, so a compressor can only reorganise the data — optimise row filters, strip metadata and re-pack the pixel stream more efficiently. Typical savings are 5–25%, and screenshots with large flat areas usually do better than photographs.

That also explains the upper limit. If you need a 70% reduction on a photograph, the honest route is switching format: WebP or JPEG will get you there, at the cost of some pixel-perfect accuracy. PNG is the right choice when you must keep sharp edges, exact colours or transparency.

This page keeps the output format at PNG, so the quality slider is not used. The tool warns you when re-packing cannot beat the original and simply keeps your file unchanged.

How to optimise a PNG

Add PNG files

Drop files or a folder, or paste an image from the clipboard. Only PNG files benefit here — other formats are better handled by the converter.

Optionally resize

Lossless re-packing is modest. If you need real savings, cap the maximum width or height; halves the pixels means roughly half the data with no extra quality loss.

Download the result

Files that cannot be improved are kept as-is and marked "Kept original", so you never end up with a larger file.

Questions about this task

Why did my PNG only shrink a little?

Lossless compression can only remove redundancy, not detail. Photographs have very little redundancy, so 5–15% is normal. Screenshots, icons and graphics with flat colour blocks compress much better.

Will transparency survive?

Yes. The alpha channel is preserved, which is the main reason to stay in PNG instead of converting to JPEG. Converting to WebP also keeps transparency and usually produces a smaller file.

Can I get a big reduction and keep it lossless?

Use lossless WebP or AVIF instead of PNG — both are typically 30–50% smaller at the same pixel data. This tool can output them; just choose WebP or AVIF in the settings before processing.

Other image tasks

Same local processing, different starting point:

Compress JPG Images

Drop your JPG files, choose a quality level or a target file size, and download smaller copies — re-encoded lo...

Compress WebP Images

Lower the quality of existing WebP files, or cap them to a precise file size — batched and processed locally.

Back to Image Compressor & Converter

All formats in one workspace — batch compression, conversion, resizing and before/after comparison.