⌘ K
png · ico · multi-size · local

Generate a multi-resolution .ico from any PNG

Pick which sizes to include (16, 32, 48, 64, 128, 256). The tool packages PNGs into a valid Windows ICO container. Runs locally.

PNG to ICO
Source
—
no file
Output
—
ico
Sizes
6
16,32,48,64,128,256
Status
idle
live
Sizes:
input · image

image/png · runs locally · nothing uploaded

output · preview
ICO output appears here
Quick Start

How it works

Pick an image, tune the options, then download the result. Everything runs in your browser.

  1. 01

    Pick a PNG

    Square sources at 256x256+ work best.

    Files stay in memory as an HTMLImageElement — the original bytes are never uploaded, and EXIF metadata is preserved until you explicitly transform it.

    uploadcanvaslocaldecode
    input · bytespng · loaded
    logo.png
    loaded · decodedcanvas · ready
  2. 02

    Choose sizes

    Toggle the sizes you want in the bundle.

    Encoder quality is exposed where the format supports it — JPEG and WebP get a 0–1 quality slider; PNG is lossless. Options re-render the canvas immediately.

    sizesoptionslive previewencoderquality
    sizes · tunable6 · live
    16, 32, 48, 64, 128, 256px
    options applied · liveencoder · live
  3. 03

    Build ICO container

    Each size is rendered as PNG then packed into a Windows-spec ICONDIR.

    Pixel work runs on the Canvas 2D context — drawImage resamples with the browser’s bilinear filter and getImageData/putImageData back per-pixel passes.

    buildrenderCanvas 2Dpreviewpx-perfect
    format · resamplediconDIR + entries · px-perfect
    header + dir + pngs
    preview · livepx-perfect
  4. 04

    Download ICO

    Drop into your /public folder, alongside favicons, or use as a Windows app icon.

    Downloads ship via a hidden anchor with an object URL — no server round-trip, and the file on disk is untouched. The output filename inherits a sensible suffix.

    exportdownloadblobclient-sideobject URL
    ok · blobready · saved
    icon.ico
    shipped · ready to shipsuccess
Pro tips

Browser-only image work that scales

Convert with quality control

JPEG/WebP let you pick a 0–1 quality. Default 0.92 is a good compromise of size and visible quality.

PNG isn’t free

Use PNG only for transparency or sharp edges. For photos, WebP is smaller at the same perceived quality.

Strip EXIF for privacy

Photo EXIF often contains GPS, camera model, and timestamps. Strip before sharing public uploads.

Watch the colour profile

Convert to sRGB before web export. Wide-gamut images render oversaturated in non-managed browsers.

AVIF when it’s available

AVIF beats WebP on size at the same quality. Detect support via <picture> with fallbacks.

Lazy-load below the fold

Add loading="lazy" on <img>. The browser handles scheduling — no IntersectionObserver needed.

Related toolsICO to PNGFavicon GeneratorApp Icon GeneratorSplash ScreensPNG to JPGImage Resizer
Use Cases

When to use this tool

Common workflows it speeds up.

Favicons

Classic favicon.ico for the broadest support. Decoded into a Canvas 2D context — original bytes never leave the tab, so you can process customer-uploaded photos, internal screenshots, or sensitive diagrams without privacy concerns.

px-perfect

Windows app icons

Bundle multiple sizes for Win32 apps. Encoders expose quality 0–1 where the format supports it (JPEG, WebP); PNG and AVIF stay perceptually lossless. Pick 0.85 for web, 0.95 for archival, 0.7 for thumbnails.

quality-tunable

Electron apps

App-bundle icons for Win packaging. Pair with the EXIF Stripper before sharing user-uploaded photos publicly. Camera serial numbers, GPS coordinates, and timestamps often hide in image metadata and leak more than the picture itself.

format-aware

Browser extensions

Pack icon sizes for Chrome and Firefox. Output preserves colour profile (sRGB) so it renders consistently across browsers, monitors, and print pipelines. Wide-gamut workflows can opt into Display P3 for modern Apple devices.

EXIF-safe

Legacy systems

Some IDEs and installers still want ICO. Re-runs only on option changes, never on window resize, so the canvas stays responsive on large images. drawImage uses the browser's bilinear filter for fast resampling.

client-side

Multi-DPI delivery

One file, multiple resolutions. Downloads as .png, .jpg, .webp, or .avif with the correct MIME so editors apply native handling on save. The filename inherits a sensible suffix derived from the input.

compression-ready
FAQ

Frequently asked questions

A square PNG at 256x256 or larger. Non-square images are letterboxed to keep aspect.
Yes — modern ICO with embedded PNG payloads, which Windows and browsers accept.
Modern browsers prefer PNG via <link>. .ico is only needed for very old browsers and Windows OS-level icons.
ICO encodes dimensions as a single byte (0-255), so 256 is stored as 0 by convention.
No. Everything runs locally in your browser.
Suggest a tool

Something missing?

Tell us what you need. We ship the top requests every two weeks.

Sent straight to the maintainers · no account needed
47 in queue·8 shipped this month
Request queued. Thanks!