ICO is the Windows icon container — the format browsers still ask for at /favicon.ico and the one Windows uses for app and shortcut icons. What makes it unusual is that a single .ico file can hold several resolutions at once (16×16, 32×32, 48×48, up to 256×256), so the system can pick the right one for a tab, a taskbar or a desktop shortcut.

This guide covers both directions: turning a PNG into an ICO, and pulling a PNG back out of an existing .ico file. We scored ten real tools on five weighted criteria. Quick answer: for full control over multi-resolution icons in either direction, ImageMagick tops the list; if you want a complete favicon package with zero setup, RealFaviconGenerator is a hair behind at #2, and Pixelor is the fastest free, no-upload option at #3.

Disclosure: Pixelor publishes this list and is one of the tools featured in it. We apply the same scoring rubric to every tool, and we say plainly where a competitor beats us — two tools outrank Pixelor here because their icon output is genuinely better.

Key Takeaways

Best overall / most control: ImageMagick — true multi-resolution ICO from one command, both directions, fully offline.

Best for favicons: RealFaviconGenerator — a complete icon set plus the HTML to install it, and since its rewrite it runs in your browser.

Best free + private, no install: Pixelor — converts PNG↔ICO on your device, nothing uploaded.

Best zero-effort favicon package: favicon.io — drop a PNG, get a ZIP with an .ico and every PNG size.

Best free desktop batch: XnConvert — hundreds of images to .ico offline, for free.

How we evaluated & scored

Every tool was scored /10 on five weighted criteria, combined into a weighted overall score (rounded to one decimal):

Criterion	Weight	What it measures
Conversion quality & output control	30%	Multi-size ICO support, transparency handling, size/format options, ICO→PNG extraction
Batch / bulk support	20%	Multi-file / folder conversion; free vs gated
Privacy (on-device vs upload)	20%	Client-side/local = high; server-upload = lower for private assets
Ease of use	15%	Setup/install friction, clarity, speed to result
Price / value	15%	Truly free vs freemium caps vs paid

Overall = 0.30·Quality + 0.20·Batch + 0.20·Privacy + 0.15·Ease + 0.15·Price. Every entry was verified against the tool's own official site in 2026. Prices and limits change often, so confirm on the vendor's page before you rely on a number.

Comparison table: 10 best PNG to ICO converters

Rank	Tool	Best for	Bulk?	Price	Uploads files?	Score /10
1	ImageMagick	Multi-size ICO, scripting	Yes (scripts)	Free (open source)	No — local CLI	8.3
2	RealFaviconGenerator	Complete favicon packages	No (one image)	Free; paid tiers available (as of 30 Jul 2026)	No — runs in your browser	8.2
3	Pixelor	Free + private, both directions	Yes (credits)	Free; credit packs from $4.99	No — runs locally in-browser	7.8
4	favicon.io	Zero-effort favicon ZIP	No (one image)	Free	No — runs in your browser	7.6
5	XnConvert	Free offline batch	Yes (folders)	Free	No — desktop app, offline	7.5
6	CloudConvert	API / automation	Yes	Free 10/day; paid by credit volume (as of 30 Jul 2026)	Yes — server-side	7.4
7	GIMP	Hand-built multi-size icons	Limited (scripting)	Free (open source)	No — desktop app, offline	7.3
8	EZGIF	Quick free web conversion	Limited	Free	Yes — server-side	6.8
9	Convertio	Simple online batches	Yes	Free tier; paid ~$10–$12/mo (as of 30 Jul 2026)	Yes — server-side	6.6
10	Photopea	Editing before export	No (manual)	Free; Premium ~$5/mo (as of 30 Jul 2026)	No — client-side in-browser	6.4

The "Uploads files?" column is about privacy: a "No" means your source image never leaves your device. Below, each entry shows its five sub-scores so you can see how the overall was built.

1. ImageMagick — best for multi-resolution ICO files

Best for: anyone who needs a real multi-size .ico and is comfortable with a command line. magick logo.png -define icon:auto-resize=256,128,64,48,32,16 favicon.ico packs every size into one file and keeps transparency, and magick favicon.ico frame.png goes the other way (ImageMagick).

Scores: Quality 9 · Batch 8 · Privacy 10 · Ease 3 · Price 10 → 8.3/10

Pros: genuine multi-resolution ICO output, works in both directions, scriptable over whole folders, completely local and free. Cons: you have to install it and learn the syntax; there's no GUI, which makes it the wrong tool for a one-off icon.

Price: Free and open source. Who should pick it: developers, sysadmins and anyone building icons inside a script or CI pipeline.

2. RealFaviconGenerator — best for complete favicon packages

Best for: shipping a favicon that works everywhere. Upload one square image and it generates the .ico, the PNG sizes, an SVG favicon, Apple touch icons and the HTML markup for your <head>, with per-platform previews and a checker for live sites (RealFaviconGenerator). Since its 2024 rewrite, generation runs entirely in your browser — the site states your logo is no longer sent to its server.

Scores: Quality 9 · Batch 4 · Privacy 10 · Ease 9 · Price 9 → 8.2/10

Pros: best-in-class favicon output, per-platform tuning, in-browser processing, generated markup and a favicon checker. Cons: one master image at a time — it's a favicon generator, not a bulk converter — and it doesn't convert ICO back to PNG.

Price: Free to use; paid tiers and an API are available for advanced features — see the vendor page (as of 30 Jul 2026). Who should pick it: web developers and site owners who want the whole icon set done properly in one pass.

3. Pixelor — best free and private converter, both directions

Best for: a quick, free PNG→ICO or ICO→PNG conversion with nothing installed and nothing uploaded. Pixelor runs entirely client-side: the icon is encoded inside your browser tab, so the source image never touches a server, and the alpha channel is preserved (the icon is stored as PNG data inside the ICO container).

Scores: Quality 6 · Batch 7 · Privacy 10 · Ease 9 · Price 8 → 7.8/10

Pros: genuinely private, no install or account, free for everyday use (up to 5 files at once), converts ICO to PNG as well as PNG to ICO, works on any OS with a browser. Cons: it writes a single-resolution .ico at your source image's size rather than a multi-size icon, and it requires a square (1:1) source — so resize your PNG to 256×256 (or 32×32) before converting. If you need a full favicon set, the two tools above do that better, which is why they rank higher.

Price: Free for everyday use; credit packs — Starter 50 credits $4.99, Plus 200 $14.99, Pro 500 $29.99, Business 1,500 $69.99 — unlock bulk batches (up to 100 images) and larger files. No subscription. Who should pick it: anyone converting a private logo or icon who wants it done in seconds without uploading. Convert PNG to ICO

4. favicon.io — best zero-effort favicon ZIP

Best for: the fastest possible route from a logo to a working favicon. Drop in a PNG, JPG or BMP and favicon.io returns a ZIP containing a multi-layer favicon.ico plus 16, 32, 48, 180, 192 and 512 px PNGs, an Apple touch icon and a web manifest. Its converter page states the conversion happens in your browser.

Scores: Quality 8 · Batch 3 · Privacy 8 · Ease 10 · Price 10 → 7.6/10

Pros: completely free, no account, produces a full icon set including a multi-size .ico, and processes locally. Cons: no options at all — you can't choose sizes or tune padding — one image at a time, and no ICO→PNG direction.

Price: Free (donation-supported). Who should pick it: anyone who wants a standard favicon set in ten seconds and doesn't need to configure anything.

5. XnConvert — best free offline batch converter

Best for: turning a folder of PNGs into .ico files offline. XnConvert is the free cross-platform batch converter from the XnView team, reading 500+ formats and writing around 70 — ICO included — with 80+ actions such as resize and canvas, so you can square up images in the same pass (XnView).

Scores: Quality 6 · Batch 9 · Privacy 9 · Ease 5 · Price 9 → 7.5/10

Pros: free, high-volume batch processing, fully offline, reusable presets, resizes and converts in one step. Cons: requires a download and install, the multi-tab interface takes learning, and it writes a single-resolution icon rather than packing several sizes into one .ico.

Price: Free (freeware for personal and educational use). Who should pick it: desktop users converting many icons at once who want it free and local.

6. CloudConvert — best for automation and APIs

Best for: developers converting icons inside an application. CloudConvert's PNG to ICO tool exposes resolution and quality options, batches files, and sits behind a documented REST API; an ICO converter handles the reverse direction.

Scores: Quality 8 · Batch 9 · Privacy 4 · Ease 8 · Price 8 → 7.4/10

Pros: reliable at scale, real batch support, good output options, mature API. Cons: files are uploaded to CloudConvert's servers, and the free tier is capped at 10 conversions a day.

Price: Free tier of 10 conversions/day with up to 1 GB per file; paid credit packages and monthly subscriptions priced by volume — see the pricing page (as of 30 Jul 2026). Who should pick it: teams automating icon generation who don't mind server-side processing.

7. GIMP — best for hand-built icons offline

Best for: crafting an icon by hand, offline, with per-size control. GIMP exports the Microsoft Windows Icon format and turns each layer into an icon size, letting you set the bit depth and alpha per entry — so you can hand-build a genuine multi-size .ico (GIMP docs). It opens .ico files too, which makes ICO→PNG easy.

Scores: Quality 9 · Batch 3 · Privacy 10 · Ease 3 · Price 10 → 7.3/10

Pros: free and open source, full local control, real multi-size ICO export, and precise editing before you export. Cons: fiddly — you scale and stack a layer per size manually — with a steep learning curve and no easy built-in batch.

Price: Free (open source). Who should pick it: designers who want to tune each icon size themselves without uploading anything.

8. EZGIF — best quick free web converter

Best for: a fast one-off conversion in either direction with no account. EZGIF's PNG to ICO tool lets you pick a target size (16, 32, 48, 64, 128 or 256 px), and its ICO to PNG tool extracts the highest-resolution image from an existing icon while preserving transparency.

Scores: Quality 7 · Batch 5 · Privacy 4 · Ease 9 · Price 10 → 6.8/10

Pros: free with no signup or watermarks, explicit size choices, covers both directions, generous 200 MB limit. Cons: files are uploaded to EZGIF's servers (deleted an hour later), and it's a one-file-at-a-time workflow with an utilitarian, ad-supported interface.

Price: Free. Who should pick it: anyone who wants a specific icon size right now and isn't converting anything confidential.

9. Convertio — best simple online batch tool

Best for: converting a handful of images without installing anything. Convertio's PNG to ICO page accepts several files at once and converts each into its own icon, and its ICO to PNG tool pulls the highest-resolution frame out of an icon.

Scores: Quality 7 · Batch 7 · Privacy 4 · Ease 9 · Price 6 → 6.6/10

Pros: very easy, handles both directions, multi-file uploads, broad format coverage. Cons: files are processed in the cloud, the free tier is metered (heavier batch use is pushed to a paid account), and there's little control over icon sizes.

Price: Free tier with daily limits and up to 1 GB per file; paid plans roughly $10–$12/month (as of 30 Jul 2026) — check the vendor page. Who should pick it: occasional users who want a familiar, no-fuss online converter.

10. Photopea — best for editing before export

Best for: touching up or squaring off an image and then saving it as an icon. Photopea is a free Photoshop-style editor that runs client-side in your browser and lists ICO among the raster formats it can both open and export.

Scores: Quality 7 · Batch 3 · Privacy 8 · Ease 5 · Price 9 → 6.4/10

Pros: powerful free editor, files stay in your browser, opens .ico files for editing, precise control over the artwork itself. Cons: ICO export is capped at 256×256 and users have reported missing metadata in exported icons; there's no batch mode, and a full editor is overkill for a simple conversion.

Price: Free with ads; Premium around $5/month (as of 30 Jul 2026). Who should pick it: designers who need to crop, recolour or square an image before exporting an icon.

Converting the other way: ICO to PNG

Going the other way is easier, with one catch: an .ico can contain several images, so every tool has to decide which one to hand you. Most extract the highest-resolution frame — that's what EZGIF and Convertio do, and it's usually what you want. If you need every frame, use a tool that addresses them individually: ImageMagick writes favicon-0.png, favicon-1.png and so on from a multi-frame icon, and GIMP opens each size as its own layer.

For a quick extraction with nothing uploaded, Pixelor's ICO to PNG converter decodes the icon on your device and keeps transparency intact. Remember that upscaling a 32×32 icon won't add detail; if you need a big, crisp image, go back to the original artwork. Convert ICO to PNG

How to pick the right PNG to ICO converter

Building a website favicon? Use a tool that outputs multiple sizes in one .ico: RealFaviconGenerator or favicon.io for a complete package with markup, or ImageMagick's icon:auto-resize if you're scripting it.
Converting a private or unreleased logo? Choose something that doesn't upload — Pixelor and Photopea run in your browser; ImageMagick, GIMP and XnConvert run on your machine.
Converting lots of images? XnConvert (free, offline folders), CloudConvert (server-side, API) or Pixelor's credit packs (in-browser, up to 100 at once).
Just need one icon, fast? favicon.io or Pixelor will have it done before an installer finishes downloading.
Two rules that apply everywhere: start from a square image, and start from a large PNG — icons scale down cleanly, never up.

Frequently asked questions

What is the best free PNG to ICO converter?

For a complete favicon set, favicon.io and RealFaviconGenerator are both free and produce a multi-size .ico. For a free conversion that never uploads your image, Pixelor works client-side in the browser, and ImageMagick or XnConvert are free offline options for anything bigger.

Should a favicon.ico contain multiple sizes?

Usually yes. A single .ico holding 16×16, 32×32 and 48×48 lets browsers and Windows pick the sharpest version for each context instead of rescaling one image. Modern sites often pair it with a 512×512 PNG and an SVG favicon, which the favicon-package generators above emit for you.

Why does my PNG to ICO conversion fail or look stretched?

Because ICO expects square icons. A 1200×630 banner has no valid square icon shape, so tools either refuse it or squash it. Crop or pad your image to a 1:1 ratio — ideally 256×256 — before converting.

Does converting PNG to ICO keep transparency?

Yes, if the tool writes a 32-bit icon with an alpha channel — every converter in this list does. That's why PNG is the ideal source: it carries transparency losslessly into the icon.

How do I convert an ICO file back to PNG?

Open it in any tool that reads the format: Pixelor's ICO to PNG converter does it in-browser without uploading, while EZGIF and Convertio do it online. All of them extract the highest-resolution image in the file; ImageMagick and GIMP can extract every embedded size separately.

About this list — how we test. This roundup was researched and written by Team Pixelor. We scored each tool on the five weighted criteria above and verified features, platforms and pricing against each tool's official website in 2026. Pixelor is a free, client-side file converter and compressor — your files are processed in your browser and never uploaded — and, as disclosed above, it's one of the ten tools featured here. Two competitors outrank it on this page because their icon output is better, and we'd rather tell you that than pretend otherwise. Learn who we are on our About page, reach us via Contact, or read how we handle files on our Privacy page.

Related tools: PNG to ICO converter · ICO to PNG converter · PNG to JPG · All converters

Best PNG to ICO Converter (2026): 10 Tools Ranked