PNG · oxipng · Lossless toggle

Compress PNG
keep transparency
when you need it

Shrink PNG screenshots and UI graphics locally. oxipng with optional lossless — strip metadata, keep alpha, batch a folder offline.

Download for Windows Lossless vs lossy →
PNG · oxipng · Transparency · Offline
1.9 MB example PNG−31% savedLossless toggle
Lossless

Two modes for PNG

Screenshots and UI need different handling than photos. Choose per batch.

Lossless

Bit-exact, alpha preserved. Strips metadata and recompresses structure. No quality slider needed.

Lossy + keep alpha

When size matters most, allow lossy PNG/WebP conversion while keeping transparency where possible.

Convert to WebP

Smallest for web. Transcode the batch to WebP in one pass — see PNG to WebP.

Proof

PNG savings

FileBeforeAfterSaved
brand-sheet.png1.9 MB1.3 MB−31%
ui-screenshot.png2.4 MB1.6 MB−33%
icon-set.png860 KB540 KB−37%

Lossless avg −15–25%, lossy/WebP avg −30–45% depending on content.

How it works

PNG in three steps

01 01
Select PNGs

Choose a folder, filter to PNG. Check what you want.

02 02
Choose mode

Lossless toggle, or allow conversion. Preview per file.

03 03
Batch

Run locally, backups to /backup.

Related

Next for PNG

Compress to 100KB

Hit a size target. 100KB →

FAQ

PNG — FAQ

+Will transparency be preserved?

Yes. Lossless keeps alpha bit-exact. Lossy/WebP keeps alpha where the target format supports it.

+Is PNG compression lossless by default?

Toggle on → lossless (metadata only). Toggle off → allows more aggressive shrinking and optional WebP conversion.

+Do I need to upload?

No. All PNG processing is local. No upload, no account.

PNG · oxipng

Make PNGs smaller. Keep what matters.

Lossless when you need it, smaller when you don’t — all offline.

Download for Windows PNG to WebP →
Offline · Transparency · Windows