Favicon Generator

Generate PNG favicons in multiple sizes from any image. 100% browser-based with zero server uploads.

Input
Drop an image here or click to browseSupports: PNG, JPG, WEBP, AVIF, BMP, GIF
Output
Select an image and choose sizes
🛡️Zero server logs. Favicon generation runs 100% inside your browser via Web Workers. Your files never leave this tab.
🛠️Developer Tool Belt
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Favicon Generator

Favicon Generator creates PNG favicons in up to 10 different sizes from your uploaded image. All processing happens locally via Web Workers — your images never leave your device.

🔒 Client-side only⚡ Web Worker processing🌐 Works offline🛡️ Zero server logs

How to Generate Favicons Online

  1. Drag and drop an image or click to select from your device.
  2. Choose which favicon sizes to generate (16×16 through 512×512).
  3. Click Generate Favicons to create all selected sizes instantly.

Frequently Asked Questions

Got questions about favicon generation? We've got answers.

Is Favicon Generator safe to use?

Yes, absolutely. Favicon Generator runs entirely in your browser via Web Workers. Your images are never uploaded to any server.

What sizes are available?

You can generate favicons in sizes: 16×16, 32×32, 48×48, 64×64, 96×96, 128×128, 180×180, 192×192, 256×256, and 512×512 pixels.

What file format are the favicons?

All generated favicons are in PNG format with high-quality downscaling.

Automated E2E Test Suite Logs

Our build systems validate edge-case processing under extreme conditions before each deployment.

Stability
100.0%
Passed
14/14
Env
V8-Sandbox
Engine: Vitest RunnerUpdated: 2026/6/13 02:40:10📦 Download Test Datasets
PASSPure Function Unit Tests generateFavicons should handle valid image input
PASSPure Function Unit Tests generateFavicons should reject invalid input
PASSPure Function Unit Tests generateFavicons should not mutate original input
PASSPure Function Unit Tests generateFavicons should handle boundary input
PASSPure Function Unit Tests FAVICON_SIZES should export the expected sizes
PASSPure Function Unit Tests FAVICON_SIZES should not contain duplicates
PASSPure Function Unit Tests FAVICON_SIZES should have exactly 10 sizes
PASSFaviconGeneratorTool should render Input and Output labels
PASSFaviconGeneratorTool should call generate when Generate Favicons is clicked and imageInfo is set
PASSFaviconGeneratorTool should disable button when isLoading is true
PASSFaviconGeneratorTool should render privacy strip
PASSWorker Behavior should process valid action and return ok:true
PASSWorker Behavior should return error for unknown action
PASSWorker Behavior should return error for invalid payload
⏱️ 0.18ms📦 1.5KB🎚️ Max Nesting: 3🌿 AST Nodes: 48🛡️ V8 Heap: Healthy
$ codecaven-validator --scope=tool● CLUSTER COMPLIANT

Tool Changelog & Updates

v1.2.02026-06-12
  • UX: Added missing padding to output panel for better visual spacing.
v1.1.02026-06-11
  • Feature: Added comprehensive Vitest test suite covering Tool rendering, worker operations, and shared operation logic — all 871 image tests passing.
  • Fix: Fixed OffscreenCanvas mock patterns in tests for proper constructor instantiation.
v1.0.02026-06-11
  • Feature: Initial release with multi-size PNG favicon generation (16×16 through 512×512) — 100% client-side via Web Worker.
  • UX: Drag-and-drop upload zone with size selection grid and select-all/none controls.
  • UX: Visual favicon grid preview with individual download buttons and bulk download all.
  • Security: Web Worker isolation ensures zero data uploads — all processing stays in the browser.