JPG to ICO Converter

How to Convert JPG to ICO Online

1. Upload Your JPG File: Drag and drop or click "Add Files" to select JPG, JPEG, or JFIF images. Square sources work best — a non-square photo will be letterboxed or cropped at small icon sizes. Batch is supported.
2. Pick an Icon Resolution Preset: Choose 256, 128, 64, 48, 32, or 16 pixels from the Image Resolution preset, or enter custom width × height. 256 is the maximum size a single ICO entry can hold and is the standard for Windows Vista and later.
3. Tune Quality and Bit Depth (Optional): Set image quality from Lowest → Highest, adjust the file resolution percentage, or choose a color palette size (2 / 4 / 8 / 16 / 32 / 64 / 128 / 256 colors) for indexed-color icons. Use bit-depth controls (1-, 8-, or 16-bit) when targeting legacy Windows.
4. Convert and Download: Click Convert. Files convert in your browser session and download as .ico — no sign-up, no watermark. Rename to favicon.ico and drop into your site root.

Why Convert JPG to ICO?

ICO is the icon container Microsoft built for Windows in 1985, and it is still the format every browser will look for at /favicon.ico before parsing any HTML link tags. A single ICO file can hold multiple square images at different sizes and color depths, so the browser or operating system picks the entry that best matches its display context. Common reasons to convert JPG → ICO:

• Website favicon (/favicon.ico) — Chrome, Firefox, Edge, and Safari all request /favicon.ico from the site root before reading <link rel="icon"> tags. An ICO containing 16×16 and 32×32 layers is still the most compatible single-file fallback in 2026.
• Windows desktop shortcut icon — Right-click a .lnk shortcut → Properties → Change Icon — Windows expects an .ico file. JPGs and PNGs are not accepted in the icon picker.
• Windows Explorer folder customization — desktop.ini references a custom folder icon by .ico path. Convert a JPG cover image to ICO to brand project folders.
• Custom application icons — Electron, NW.js, and packaged .exe builds (Inno Setup, NSIS) require an ICO with multiple sizes for the taskbar, start menu, and high-DPI displays.
• Mailto and bookmark recognition — Browsers fetch /favicon.ico for the bookmarks bar, history list, and (on desktop) browser tabs. A 16×16 layer in the ICO renders crisply at standard DPI.
• Legacy software compatibility — Older Win32 tools, IDEs, and installers only accept .ico for icon resources; PNG and SVG support is recent and uneven.

Favicon & Icon Size Cheat Sheet (2026)

The practical 2026 minimum for favicon.ico is a single multi-size ICO containing 16×16 and 32×32. Add a 48×48 layer if you want crisp Windows site-pinning. Anything beyond 48×48 is better served by PNGs referenced from <link rel="icon" sizes="..."> and an Apple touch icon and web app manifest.

ICO vs PNG vs SVG for Favicons

ICO Container Quick Facts

ICO is a Microsoft container, not a codec. Each entry inside an ICO is either a BMP image (with separate XOR color mask and AND transparency mask for legacy formats) or, since Windows Vista, an embedded PNG. Microsoft recommends PNG-embedded entries for any 256×256 layer to keep the file size reasonable — uncompressed 256×256 32-bit BMP is ~256 KB, the same image as PNG is typically under 30 KB. Per the ICO specification, a single file's idCount header holds up to 65,535 directory entries, though real-world favicons rarely exceed 6 sizes.

Frequently Asked Questions

What is the maximum size of an ICO icon?

256×256 pixels per entry. This cap was set when Windows Vista added 256×256 32-bit color support and PNG-compressed entries. You can technically store a larger PNG inside the container, but Windows Explorer, File Explorer, and every mainstream browser will not render entries above 256×256 — they fall back to the next-largest valid size.

Should I include every size from 16 to 256 in my ICO?

No. A minimal modern favicon.ico needs 16×16 and 32×32. Add 48×48 if you care about Windows pinned-site rendering. Sizes 64, 96, and 128 are rarely picked by any browser or OS — they bloat the file without improving the rendered icon. Use PNGs (Apple touch 180, Android 192/512) for the larger contexts.

Does the ICO file work as a transparent favicon if my source is JPG?

No — JPG has no alpha channel, so the converted ICO will carry an opaque background matching the JPG's pixels. If you need a transparent favicon, start from a PNG with transparency: PNG to ICO. Alternatively, edit the JPG in Photopea, Photoshop, or GIMP to knock out the background, export as PNG, then convert.

How do I install the favicon.ico on my website?

Place the file at the document root so it resolves at https://yoursite.com/favicon.ico. Browsers fetch this path automatically. To be explicit, also add <link rel="icon" type="image/x-icon" href="/favicon.ico"> to the <head>. For modern setups, add 32×32 and 192×192 PNG <link> tags plus an apple-touch-icon 180×180.

Why is my icon blurry at 16×16?

JPG sources are usually downscaled from a much larger photo. At 16×16, fine detail and gradients collapse into a smear. Two fixes: (1) start from a clean square source at least 256×256, and (2) hand-design the 16×16 and 32×32 layers in an icon editor rather than rely on auto-downscaling — small icons benefit from manual anti-aliasing and reduced detail.

Can I convert JPEG and JFIF files too, or only .jpg?

Yes. JPG, JPEG, and JFIF are the same JPEG-format bytes with different file extensions — the converter treats them identically. Drop in any mix and they all encode to ICO.

Will my ICO work for Windows desktop and taskbar shortcuts?

Yes, as long as the ICO contains 32×32 and 48×48 layers (and ideally 256×256 for high-DPI "Extra large" Explorer views). Right-click a shortcut → Properties → Change Icon, browse to your .ico, and Windows reads the appropriate entry per context.

How does this compare to converting JPG to PNG and using PNG as the favicon?

PNG-as-favicon works in every browser released after roughly 2010, but browsers still request /favicon.ico from the root automatically — without an ICO there, they will log a 404 and fall back. The robust modern setup is both: a small multi-size ICO at /favicon.ico plus 32×32 and 192×192 PNGs referenced via <link> tags. If you only want PNG, try JPG to PNG first, or go the other direction with ICO to PNG.

Can I batch-convert many JPGs to ICOs at once?

Yes. Drop in a folder; each file becomes its own ICO with the same settings. Useful when you maintain icons for multiple Windows shortcuts, side-project favicons, or a documentation site with per-section icons. Downloads come individually or as a single ZIP.