Compress PNG Online, Keep Transparency.
Smaller PNGs. Perfect Transparency. Nothing Uploaded.
Your logo, your app screenshots, your UI assets - compressed locally in your browser. Transparency fully intact. No server ever sees your files.
Choose images to compress
Drag & drop or click to browse (PNG)
Need to reduce PNG file size without losing transparency? FastCompressor helps you compress PNG images for websites, apps, ecommerce, and design workflows while keeping crisp edges and clean alpha channels.
Why PNG Compression is Different - and Why FastCompressor Gets It Right
Alpha Channel Always Protected
Transparent PNGs are deceptively easy to break.
A bad compressor will either corrupt the alpha channel or refuse to compress at all.
FastCompressor's engine was built with alpha-channel handling as a first-class requirement.
Palette Optimisation Without Banding
PNG8 quantization can introduce colour banding on gradients.
FastCompressor uses perceptual quantization - it reduces palette size where your eye won't notice, and preserves where it will.
Batch Compress PNG Folders
Export 80 icons from Figma.
Drop the folder.
Get all 80 compressed, transparency intact, in under 5 seconds.
That's the Pro workflow.
Core Web Vitals Ready
Google's Largest Contentful Paint directly penalises large uncompressed images.
Compressed PNGs load 3-5x faster, which directly improves your Lighthouse score.
Built for professionals who need speed, privacy, and quality.
- UI/UX designers exporting Figma or Sketch assets for web delivery
- iOS and Android developers optimising app store screenshots
- Developers compressing icon sets and sprite sheets
- Shopify merchants with transparent product cutout images
- Marketing teams compressing banner ads and social templates
Why use FastCompressor Desktop for compress png online, keep transparency.?
Online tools are great for quick, single-image edits. But when you need to process hundreds of files or maintain strict privacy, native software is the only way to go.
Compress any PNG in under 10 seconds
Drop your PNG
Works with logos, UI screenshots, icons, product images, and layered exports from Figma or Sketch. Transparency is detected automatically.
Choose compression level
Lossless reduces metadata and optimises the palette. Lossy shrinks further with minimal visible impact. Both preserve alpha channels.
Download your PNG
Same format, same transparency, dramatically smaller file. No format conversion, no re-uploading.
Deep Dive
Learn how it works
The PNG transparency problem nobody talks about
PNG became the go-to format for UI design because of one feature: alpha transparency. But that same transparency is why PNG files are so large - and why compressing them wrong destroys the transparent edges.
Every online PNG compressor that uploads your file processes it on a generic server using one-size-fits-all settings. FastCompressor analyses each PNG's specific palette and alpha channel before choosing the compression strategy. Logos with flat colours get palette quantization. Photographs saved as PNG get dithering. UI exports with gradients get a different approach entirely.
The result is transparent PNGs that are 60-80% smaller - with edges that remain clean at every zoom level.
For Figma and Sketch users: When you export frames as PNG, Figma defaults to the highest quality setting. These files are enormous. FastCompressor's browser tool handles exported PNGs from both tools without the edge fringing that other compressors introduce.
For web developers: Large PNGs are one of the leading causes of poor Core Web Vitals scores. Google's Lighthouse tool flags unoptimised images as a direct performance issue. A 400 KB PNG icon compresses to under 80 KB without visual change - that's 0.3 seconds of page load time recovered per image.
For Shopify merchants: Product images saved as PNG (for background transparency) are often 2-5 MB each. Compress them to under 500 KB and your store's PageSpeed score improves measurably.
How we compare
See why teams choose FastCompressor
| Feature | FastCompressor | Typical Online Tool |
|---|---|---|
| Transparency preserved | Yes - always | Sometimes broken |
| PNG8 quantization | Perceptual, no banding | Aggressive / artefacts |
| Metadata stripping | Optional - your choice | Forced, no control |
| Batch folder compression | Unlimited (Pro) | Not available |
| Offline processing | Yes | No |
| Price | $19 once | $5-79/month |
Frequently Asked Questions
Compress Unlimited PNGs - Get Pro for $19
Transparency preserved · Batch folders · 30-day guarantee · No subscription