Compress PNG — smaller files, identical pixels

The heaviest files on most computers are screenshots — full-resolution PNGs that nobody ever resized. Because PNG is lossless, squeezing it takes strategy rather than a quality slider: re-encode cleanly, cut the dimensions down to what is actually displayed, or switch web-bound copies to WebP with transparency intact. Scalir runs all three plays in one pass, in your browser, on as many files as you can drop.

Preconfigured for PNG output — switch to Auto or WebP below for bigger savings.

Drop images here

or

Choose files

JPG, PNG, WebP, AVIF, HEIC, GIF, TIFF, BMP · processed on your device, never uploaded

Max size (MB)

Target file size — we compress just enough to fit under this. Output format Auto keeps the original, switching to WebP only when it helps. Or force one format (AVIF is the smallest, but slower to encode).

Three ways to a smaller PNG

Approach	What it does	Typical saving
Re-encode as PNG	Lossless — every pixel identical	Modest
Resize the dimensions	Fewer pixels, still lossless per pixel	Often the biggest win
Convert to WebP	Visually identical, transparency kept	60–90% smaller

Screenshots: the classic oversized PNG

A screenshot from a modern laptop is a 2800px-wide PNG weighing several megabytes — destined for a doc, a ticket or a chat where it displays at a quarter of that width. Nothing about the pixels needs to change qualitatively; there are simply four times too many of them.

Scalir's default 2000px cap fixes the worst of it automatically, losslessly per pixel. Set the cap to the width you actually display — say 1200px — and screenshot weight drops by 80% before any format decision is made.

Shrink a batch of PNGs

Drop them inScreenshots, exported graphics, transparent logos — the queue takes a folder at a time.
Pick your strategyStay PNG for pixel-perfect output, or flip the format to Auto/WebP and let transparency-safe conversion do the heavy lifting.
Collect the resultsPer-file downloads, one ZIP, or straight into a folder — with before/after sizes shown for every file.

Frequently asked questions

Why is PNG compression lossless?

The PNG format guarantees every pixel is preserved exactly, so a PNG can only be squeezed so far. For big reductions you either shrink the dimensions or switch to a modern format like WebP.

How do I make a PNG smaller without losing transparency?

Either keep PNG output and reduce the dimensions, or convert to WebP — it supports the same full alpha transparency at a fraction of the size. Scalir does both, in bulk, on your device.

Should I convert PNG to WebP instead of compressing it?

If the image is headed for a website, usually yes: WebP is typically 60–90% smaller with transparency kept. Keep PNG when a tool demands it or you need a lossless master. Convert PNG to WebP

Why are my screenshots such big files?

High-DPI displays capture at 2× or 3× resolution, so a "small" screenshot is often 2800px wide or more — far larger than it will ever be displayed. Capping the dimensions is the fix, and it is lossless in every way that matters.