PDF to ICO Converter
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Need help?Convert PDF to ICO
ICO is the Windows icon container — the format behind application icons, shortcut icons and the favicon.ico a browser requests from a site root. This converter rasterises the pages of a PDF and writes each one as a .ico file at the size you choose, which makes it useful when your logo or brand mark only exists as a vector PDF and you need an icon out of it. It is not a way to view a document at readable size: an ICO entry cannot describe anything larger than 256 pixels on a side.
ICO Format at a Glance
| Property | Value |
|---|---|
| Full name | Windows Icon (.ico) |
| Structure | A directory of one or more images, each with its own size and colour depth |
| Size field | One byte per axis in each directory entry, where 0 is read as 256 — so 256 px is the largest size an entry can describe (Microsoft) |
| Colour depth | 4-bit and 8-bit palettes, 24-bit colour, and 32-bit with an 8-bit alpha channel |
| Compression | Uncompressed DIB bitmaps; PNG-compressed entries are allowed, and Microsoft recommends compressing only the 256×256 image |
| Microsoft's application set | 16×16, 32×32, 48×48 and 256×256; Classic Mode adds 24×24 and 64×64 (Microsoft Learn) |
| Shape | Entries record width and height separately, so non-square images are legal — but most icon consumers expect a square |
| MIME type | image/vnd.microsoft.icon (image/x-icon is the older, still-common label) |
| Typical use | Favicons, Windows application and shortcut icons, Control Panel items |
How to Convert PDF to ICO
- Upload Your PDF File: Drag the PDF onto the page or click "+ Add Files". Each page of the document is rendered and written as its own
.icofile, with a "Download All (Zip)" button when there is more than one. - Pick a Size Under Image Resolution: The preset list is the only sizing control that renders for ICO output, and it runs 256P, 192P, 180P, 128P, 64P, 48P, 32P, 24P and 16P. The preset sets the height; the width follows the page's own proportions.
- Set Conversion Quality and Background Colour: Conversion Quality is the DPI the page is rendered at before it is scaled down — 300 is preselected and gives the downscaler plenty of detail to work with. Under Image Transparency, the Color dropdown fills the page background, and White is preselected.
- Convert and Download: Click "Convert" and download the
.icofile. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark.
What Each Preset Produces, and Why Orientation Matters
The preset sets height only, and width follows the aspect ratio of the page. That is fine for a portrait document, because a portrait page is narrower than it is tall — but a landscape page or a 16:9 slide gets wider than its height, and a landscape page at a large preset overflows the 256-pixel ceiling the directory entry can describe. The bitmap is still written; it is the size the header reports that stops being right, and icon consumers that trust the header will place or scale the image wrongly.
| Preset | A4 portrait page (≈ px) | 16:9 landscape slide (≈ px) | Safe for a landscape page? |
|---|---|---|---|
| 256P | 181 × 256 | 455 × 256 | No — width far past 256 |
| 192P | 136 × 192 | 341 × 192 | No |
| 180P | 127 × 180 | 320 × 180 | No |
| 128P | 90 × 128 | 228 × 128 | Yes |
| 64P | 45 × 64 | 114 × 64 | Yes |
| 48P | 34 × 48 | 85 × 48 | Yes |
| 32P | 23 × 32 | 57 × 32 | Yes |
| 16P | 11 × 16 | 28 × 16 | Yes |
Two practical rules follow. If the page is portrait — Letter, A4, most documents — every preset is safe, because the height cap keeps the width comfortably below 256. If the page is landscape or a widescreen slide, stop at 128P. And if you leave the resolution control untouched, the page is fitted inside a 256 × 256 box with its aspect ratio preserved, which is safe in either orientation but gives you no say over the final size.
Nothing in the pipeline crops or pads the page to a square, so a full page always becomes a tall or wide rectangle. If you want a conventional square icon, crop the artwork to a square first — Crop PNG works well after a PDF to PNG pass — and convert that.
Frequently Asked Questions
Does this convert only the first page, or every page?
Every page. A multi-page PDF produces one .ico per page, delivered as separate files with a "Download All (Zip)" button. There is no "combine pages into one icon" mode, and there is no page-picker on this page — if you only want page 4, split it out first or delete the extra files after downloading.
Can I get a transparent favicon out of this?
No. The ICO container supports an 8-bit alpha channel, but this conversion path always fills the page background with the colour chosen under Image Transparency, and the "Unchanged" entry that preserves alpha is offered only when the output is PNG. If you need a transparent icon, convert the artwork with PDF to PNG first, keep the alpha, then run PNG to ICO.
What size should I pick for a website favicon?
16×16 and 32×32 are the sizes browsers actually paint in a tab and a bookmark bar, so 16P or 32P covers the classic favicon job. Pick 48P as well if the site will be pinned to a Windows desktop. Note that a browser requests one file at /favicon.ico, so a purpose-built multi-size ICO is still better than any single size — this tool writes one image per file.
Why does my icon look like a squashed rectangle instead of a square?
Because a PDF page is not square and nothing here crops it. The preset sets the height and the width follows the page's proportions, so a Letter page at 32P comes out 25 × 32 and a widescreen slide at 32P comes out 57 × 32. Crop the source to a 1:1 region before converting if a square is what you need.
The picture inside my icon is bigger than the size I asked for. What happened?
That is the landscape case. The preset caps the height at your chosen value, and the width is left to follow the aspect ratio — so a 16:9 page at 192P is written 341 pixels wide even though the directory entry can only describe values up to 256. Choose 128P or smaller for landscape pages, or crop the source to something portrait or square first.
Does the Conversion Quality (DPI) setting matter if the result is only 32 pixels tall?
Yes, though indirectly. DPI decides how many pixels exist before the downscale, and a downscaler produces cleaner edges from a dense source than from a sparse one. Leaving Conversion Quality on the preselected 300 DPI gives a Letter page 2550 × 3300 pixels to resample from. Dropping to 72 DPI mainly speeds things up and gives the scaler less to work with.
Will the text on my PDF page be readable in the icon?
Almost certainly not. At 32 or 48 pixels tall, body text collapses to a few grey rows. Icons work when the source is a single bold shape — a logotype, a monogram, a symbol. Microsoft's own icon guidance says to simplify and exaggerate details as the size shrinks rather than scaling a detailed image down. If you need a legible page image, PDF to PNG or PDF to JPG is the right target.
Is the ICO produced here a proper multi-size Windows application icon?
No — it holds the single image you asked for. Microsoft's guidance for a shipping application icon is a file containing 16×16, 32×32, 48×48 and 256×256 entries, plus 4-bit and 8-bit variants alongside the 32-bit one. Windows will scale a single-size icon to fill other slots, which is fine for a shortcut or a personal project but noticeably softer than a purpose-built set.
What happens to a PDF that already contains a raster logo rather than vector art?
It is rendered at the DPI you choose and then downscaled like anything else, so the quality ceiling is whatever resolution that embedded image had. A 200-pixel-wide logo placed in a PDF will not gain detail from a 600 DPI render. Start from the original artwork wherever you can, and reach for the PDF only when it is genuinely the highest-resolution copy you have.