Compress-Image.orgCompress-Image.org
PWA✨ Tuned for service-worker caching

Deliver 40KB Visuals for PWAs & Mobile Portals

Balance clarity and performance in product detail modules, onboarding hero art, and dashboard tiles that must feel instant over mobile networks.

Use the coverage report to see how 40KB assets influence PWA precache budgets.

Upload Images

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Supports JPG, PNG, WebP formats, batch upload supported

Compression Settings

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After uploading images, click on an image in the left list to view comparison effects here

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Where 40KB Fits

Product teams choose 40KB when they need more detail than social cards but still want guaranteed sub-second render on midrange devices.

  • Modular Dashboards
    Populate tiles in analytics or fintech dashboards without slowing data refresh cycles.
  • Signup Flows
    Highlight app benefits in progressive onboarding steps while keeping TTI below 2 seconds on 4G.
  • Product Microsites
    Serve responsive feature spotlights that feel native even inside embedded WebViews.
Benefits

Why Engineers Approve the 40KB Budget

40KB fits neatly into service worker precache manifests and leaves headroom for runtime API calls.

Precache hero assets without exceeding the 5MB default limit across major browsers.

Predictable Caching
Reduced Jank
Offline Reliability

Ship PWA-Ready 40KB Assets

Blend design and engineering checks into one workflow.

  • Define Responsive Breakpoints
    Export 2–3 widths (e.g., 640, 960, 1280) and let the compressor generate a cohesive srcset at ~40KB each.
  • Audit Service Worker Budget
    Run the built-in precache estimator to ensure your asset set fits within cache storage quotas.
  • Test Offline
    Launch the offline simulator to check blur or dithering when assets are retrieved from cache instead of network.

Built for Hybrid Teams

Design and engineering both get what they need from the 40KB toolset.

Service Worker Manifest Export

Download a ready-to-use manifest snippet with hashed filenames and revision strings.

Contrast Heatmap

Review contrast hotspots introduced by compression to maintain accessibility.

Lighthouse Snapshot

Run a quick Lighthouse check focused on LCP, CLS, and TTI using the compressed assets before pushing live.

Design Token Integration

Sync exported assets with your design system tokens for consistent usage across apps.

Role-Based Notes

Attach engineering or marketing notes to each asset so no detail gets lost between teams.

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40KB Workflow FAQ

Answers drawn from shipping high-performing PWAs.

1

Do I still need lazy loading?

Yes. Use native lazy load plus IntersectionObserver to defer below-the-fold 40KB assets.

2

How often should I refresh precache?

Regenerate the manifest whenever assets change; the exporter assigns revision hashes automatically.

3

What if I need animation?

Use lightweight Lottie JSON for motion, then fall back to a 40KB poster image for unsupported environments.

4

Can I integrate with CI/CD?

Yes—export the CLI command to bake 40KB compression steps into your deployment pipeline.

Optimize Your PWA Imagery

Test hero art, dashboard tiles, and onboarding screens against real budgets, then export production-ready 40KB assets.