Will PNG transparency be preserved?

The PNG workflow is designed around preserving alpha transparency. Verify the processed output in VisionStory before replacing an original asset.

What is lossless PNG compression?

Lossless optimisation changes the file encoding without intentionally changing the decoded pixel values. The possible reduction depends on how efficiently the source was already encoded.

How does palette reduction make a PNG smaller?

It represents the graphic with fewer colours. This can reduce size substantially for flat artwork, but gradients or photographs may show banding.

Can I upload an animated PNG?

Not in this release. APNG files must be rejected until animation frames can be processed without silently losing motion.

Are PNGs compressed on this page?

No. This page validates the files and records the intended strategy. VisionStory performs the actual compression and provides the result.

Compress PNG Images and Preserve Transparency

Drop PNG images here

PNG (not APNG) · up to 20 files · 5 MB each

Alpha

Keep transparency

Preserve transparent and partially transparent pixels.

Lossless

Protect decoded colours

Optimise the encoding without intentionally changing pixel values.

Palette

Reduce colour variety

Use fewer colours when logos or UI assets can tolerate it.

Static

Avoid losing animation

Animated PNG files stay outside this workflow.

The smallest PNG is not useful if transparency or clean edges are lost.

Frequently asked questions

The PNG workflow is designed around preserving alpha transparency. Verify the processed output in VisionStory before replacing an original asset.
Lossless optimisation changes the file encoding without intentionally changing the decoded pixel values. The possible reduction depends on how efficiently the source was already encoded.
It represents the graphic with fewer colours. This can reduce size substantially for flat artwork, but gradients or photographs may show banding.
Not in this release. APNG files must be rejected until animation frames can be processed without silently losing motion.
No. This page validates the files and records the intended strategy. VisionStory performs the actual compression and provides the result.

Compress PNG Images Without Flattening Transparency

Drop PNG images here