Why this tool is useful
Create one favicon.ico that gives browsers several crisp resolutions while keeping a private logo or draft artwork on the current device.
Local File Tools · runs locally
Private Image to ICO Converter
Turn a signature-checked PNG, JPEG or WebP image into a standards-compatible multi-size favicon.ico entirely in the browser without uploading the source.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy. No server copy is created, stored or left to delete. The file picker is cleared when processing starts, and disposable worker memory is destroyed after completion or cancellation. Preview and generated-output memory is released when you clear the tool or leave the page.
How it works
The page verifies the raster signature, bounds decoded dimensions, renders six square PNG variants and writes their byte lengths and offsets into a new ICO directory.
Practical example
Choose a rectangular WebP logo, select contain with a transparent background, inspect the six embedded sizes and download favicon.ico for the website root.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.