What is a multi-resolution .ico file?
A proper .ico file packages several resolution versions of your icon (16px for browser tabs, 32px for desktop shortcuts, 48px for taskbars) into a single file.
PNGをICOにオンラインで変換 — マルチサイズファビコン生成
Build valid multi-resolution Windows favicon .ico files.
Drop PNG images here to convert to ICO
Generate multi-size Windows favicons and application icons (.ico)
画像プレビュー
使用方法 Favicon ICO作成
1
選択してアップロード
Upload a square PNG logo, icon, or brand mark (recommended 512×512).
2
設定とプレビュー
Select the embedded frame resolutions (16×16, 32×32, 48×48).
3
処理とダウンロード
Click 'Generate .ICO Favicon' to download your standardized favicon.ico file.
技術アーキテクチャとクライアント側のプライバシー
Processing Engine
Browser Canvas 2D & Binary Transcoder
Privacy Model
100% In-Memory Sandbox · Zero Server Uploads
Format Standards
PNG, JPEG, WebP, SVG, ICO Specifications
Execution Speed
Zero Network Latency · Instant Local Output
Frequently Asked Questions
What source image should I upload for the best favicon?
Upload a square (1:1 aspect ratio) transparent PNG of at least 256×256 or 512×512 pixels with simple, recognizable shapes.
Is the generated .ico compatible with all web browsers and Windows?
Yes. The output matches standard Microsoft ICO binary format with embedded PNG frames supported by all browsers and Windows 10/11.