How do I compress a PNG file without losing quality?

Upload your PNG to the compressor and click Compress. The tool uses palette quantisation — reducing from 16 million colours to an optimised 256-colour palette — which reduces PNG file size by 70-90% while keeping full transparency and virtually no visible quality loss.

How do I compress a PNG without losing transparency?

The Web Asset Suite PNG compressor always preserves full alpha channel transparency. Upload your transparent PNG, set the compression slider, and download — your transparency is kept intact at all compression levels.

Compress PNG Online Free —
Reduce File Size, Keep Transparency

Compress PNG images online free while keeping full alpha channel transparency. Reduce PNG file size by up to 90% with no visible quality loss. No signup, no limits, instant download.

Transparency preserved Up to 90% smaller No signup Free forever

Open the Free PNG Compressor

Upload your PNG, set compression level, and download a smaller file — with full transparency always preserved. Batch upload and ZIP download free.

Compress PNG Free →

How PNG Compression Works — Transparency Always Preserved

PNG compression works differently from JPG. Rather than discarding image data, it uses palette quantisation — reducing the number of colours from 16 million down to an optimised set of 256. This dramatically reduces file size while keeping the image visually identical and preserving every pixel of your alpha channel transparency.

This is the same technique used by TinyPNG — and our compressor does it for free, with no monthly upload limit, no account required, and batch ZIP download always included.

What to Use PNG Compression For

Logos & Brand Assets

Compress transparent logo PNGs by 70-90% before uploading to your website. Smaller logos load faster on every page — important for Core Web Vitals.

UI Icons & Illustrations

Icons and UI elements in PNG format can be compressed without any visible difference. Compress entire icon sets at once with batch upload.

Product Photos with Transparency

After removing a background with our free background remover, compress the transparent PNG to reduce file size by 70-90% before uploading to your store.

Web Graphics & Banners

Compress website banners, hero graphics, and marketing images in PNG format. Smaller files improve page load speed and SEO performance.

Free PNG Compressor vs TinyPNG — What's the Difference?

TinyPNG is the most well-known PNG compression tool and uses the same palette quantisation technique. The differences are in the free tier: TinyPNG limits free users to 20 images per request and requires an account for API access. Web Asset Suite's PNG compressor has no monthly limit, no account required, and batch ZIP download is always free.

The compression quality is equivalent — both tools reduce PNG file size by 70-90% while preserving full transparency. The main advantage of Web Asset Suite is the absence of any restrictions on the free tier.

Compress PNG Online — FAQ

Upload your PNG to the compressor and click Compress. The tool uses palette quantisation — reducing from 16 million to 256 optimised colours — which reduces PNG file size by 70-90% with virtually no visible quality loss and full transparency preserved.

The Web Asset Suite PNG compressor always preserves full alpha channel transparency. Upload your transparent PNG, compress, and download — your transparency is kept intact at all compression levels.

Web Asset Suite is a free alternative to TinyPNG with no monthly upload limit, no mandatory account, batch compression, and ZIP download. TinyPNG uses the same technique but limits free users to 20 images per request.

Upload your PNG, set compression to 60-70%, and download. For most PNG files this reduces size by 70-90% with no visible quality difference. For logos and icons, the result is pixel-perfect at any compression level.

Compress PNG Online Free —Reduce File Size, Keep Transparency