Create multi-size .ico favicon files — 100% in your browser
Upload an image and select sizes to preview
All image processing happens locally in your browser — your source image is never uploaded. The generated .ico file bundles every selected size as required by the format spec. Results depend on your browser's canvas implementation. Provided as-is for development use.
About this tool
Turn any PNG into a perfect 16–256px multi-resolution favicon. Free, instant, no upload.
What Is the ICO?
The ICO is a free browser-based image tool that performs ICO generator operations entirely on your device using the HTML5 Canvas API and JavaScript. Unlike cloud-based image editors that upload your photos to remote servers, this tool processes everything locally — your images never leave your browser. It supports favicon maker formats and maintains original quality without compression artifacts. The tool handles batch processing for multiple files and provides real-time preview before applying changes. No watermark is added to output, and there are no usage limits or file size restrictions beyond your device's memory.
Who Should Use This Tool?
Content creators and social media managers use this tool daily for ICO generator tasks — resizing photos for Instagram, compressing images for faster page loads, or converting between formats. Web developers optimize favicon maker assets without installing desktop software. Photographers apply ICO file adjustments to client previews before committing to full edits in Photoshop. Small business owners create marketing visuals without paying for Canva Pro or Adobe subscriptions. Students and educators use it for quick image edits in presentations and projects. Privacy-conscious users prefer it because family photos never leave their device.
How to Use the ICO
Click the upload area or drag an image file onto the tool. The tool displays a live preview with adjustable settings — dimensions, quality, format, or effect strength depending on the operation. Use the sliders and input fields to fine-tune ICO generator parameters. Click the download button to save the processed image. For batch operations, multiple files can be loaded at once and processed with the same settings. All processing happens in your browser using Canvas API — close the tab and your images are gone. Output maintains maximum quality with no watermark.
Frequently asked
What resolutions does the favicon ICO file include?
It generates a multi-resolution ICO containing 16×16, 32×32, 48×48, and 256×256 pixel layers. Modern browsers also need a PNG fallback (the tool outputs both). The 256px layer uses PNG compression inside the ICO container per the Windows ICO specification, keeping file size under 100KB for all four resolutions combined.
Why does my favicon look blurry on high-DPI screens?
A single 16px favicon scales poorly on Retina/4K displays. Including 32px and 48px layers ensures crisp rendering at 2x and 3x device pixel ratios. This tool auto-generates all sizes from your source image and outputs the HTML link tags (rel="icon" with sizes attribute) ready to paste into your <head>.
Related tools
Why did the fish blush?
No paywalls, no signups, no data sold. Built by a solo developer who believes useful tools should be accessible to everyone.
☕Support me on Ko-fi— keep tools free100% of proceeds go towards hosting & building more free tools.