PNG Compressor
Smaller PNGs Without Killing Sharp UI Edges
Compress PNG Online for Web, Design & Screenshots
PNGs get heavy fast \u2014 especially screenshots and UI exports. SmallFast's PNG compressor shrinks files in your browser while respecting crisp edges and transparency, without uploading assets to a public image CDN.
Why In-Browser Compression is 100% Private
Most online compressors secretly upload your media to their cloud servers, storing photos and videos where they can be scanned, logged, or compromised. SmallFast changes the paradigm entirely.
0 Bytes Uploaded
Files stay strictly in your device memory. When you compress media with SmallFast, zero bytes of image or video data are transmitted over the internet.
Client-Side WebAssembly
We leverage modern WebAssembly (Wasm) and local hardware acceleration. Your CPU and GPU handle the compression math at full native speed.
Independently Verifiable
You do not have to take our word for it: open your browser Developer Tools (F12), inspect the Network tab, and observe that not a single upload request is made.
How to Compress Media Online
Optimize high-resolution images and heavy videos in seconds right inside your browser window.
Select or Drop Files
Drag and drop your media into the online compressor or pick files from your computer or phone. Files load instantly into your browser memory without being uploaded anywhere.
Customize Quality & Size
Adjust quality sliders, pick target resolution, or convert format with instant visual comparison. Fine-tune until you achieve the exact balance of size and sharpness.
Download Compressed Media
Export your compressed images or videos directly to your device with one click, or package multiple items into a single ZIP file. Your originals remain untouched.
Formats Supported by Our Online Compressor
No need to install separate converters. Compress and convert modern web and production media formats.
Keep as PNG
Native Browser EngineStay PNG when you need crisp edges or existing transparency workflows.
Consider WebP
Native Browser EnginePhoto-like PNGs often shrink more as WebP — use the converter page when lossy is OK.
What makes PNGs huge
Native Browser EngineCrop and compress before putting PNGs in production builds.
Traditional Cloud Converters vs SmallFast
| Feature | Traditional Cloud Sites | SmallFast In-Browser |
|---|---|---|
| File Upload Required | Yes (Slow, eats bandwidth) | No (0 seconds upload) |
| Data Privacy & Security | Stored on remote servers | 100% Private (Never leaves device) |
| File Size Ceilings | Strict limits (25MB-100MB) | Large files (Powered by local CPU/GPU) |
| Queue & Waiting Times | Queued behind other users | Instant parallel compression |
| Account Requirement | Often requires email / signup | No signup required for standard use |
Frequently Asked Questions
Is a PNG compressor safe for logos?+
Why is my PNG still large after compression?+
Does this upload my PNGs?+
PNG or WebP for websites?+
Can I compress PNGs in bulk?+
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Compression Guide →
Step-by-step tutorial on optimal bitrate, resolution, and format selection.
Ready to compress files without uploading?
Try SmallFast right now in your browser. No registration required, zero bytes uploaded to any cloud server.