PNG to ICO Converter
Favicons Without An Upload
This PNG to ICO converter builds a proper icon file inside your own browser. Pick the size a browser tab or a shortcut expects, then convert. Your own tab writes the header, so your artwork never goes near a server.
- FreePrice
- NoneUploads
- 256 pxLargest side
- Up to 100Batch
Convert PNG to ICO right here
Pick a square picture and an icon size, then convert. You get a real .ico file, ready to drop in as a favicon or hang on a desktop shortcut.
PNG to ICO Converter
Favicons and app icons, nothing uploaded
No images picked yet.
Inside the File a PNG to ICO Converter Makes
An ICO is not a way of squeezing a picture. It is a small folder that holds one, with a label on the front.
Inside it sits an ordinary PNG, byte for byte. The label simply says how wide it is, how tall, and where it begins.
So this page writes that label and wraps your file. Windows and every browser then treat it as a real icon.
ICO survives for one job only. MDN's guide to image file types covers where every other format belongs instead.
The Byte That Caps It At 256
The label spends exactly one byte on the width. One byte counts no higher than 255, so that is the hard limit.
A clever trick squeezes out one more step: zero means 256. Therefore 256 pixels is the largest side an icon can hold.
Anything bigger comes down to fit before the wrapping starts. In fact, no icon anywhere on the web is larger than that.
One Size Per File, Said Plainly
An ICO can hold several sizes at once, and many do. This page writes one size per file instead.
That keeps the preview honest and the byte count real. That way, the preview matches the file you download.
Need 16, 32 and 48 together? Then run the batch three times and keep whichever file each job wants.
Start From a 256-Pixel Source or Larger
The size menu is a ceiling, not a target. A 16 pixel PNG stays 16 pixels even when you ask for 32. So feed in artwork at least as large as the size you pick.
Turning PNG Into ICO, Step by Step
Zero installs, zero sign-ups, zero uploads. In fact, the size menu is the only decision.
- 1
Drop the artwork in
Drop the PNG on the Denwix panel, or tap to pick it. Up to a hundred files can queue at once.
- 2
Pick the icon size
The menu lists 16 through 256, and 32 is ready for you. That is what a browser tab reaches for.
- 3
Look it over
Clear corners show as a checkerboard in the preview. The finished byte count sits right next to it.
- 4
Convert and save
Press Convert to ICO and let it finish. Then rename it favicon.ico and drop it in your site root.
Why Build It Here
Icon generators are everywhere, and nearly all of them want your logo first. Yet the whole job is twenty-two bytes of header.
Your logo stays here
No fetch, no upload form and no storage sits in this page. That keeps an unannounced logo on your own machine.
Your tab writes the header
This page assembles the container itself, byte by byte. Therefore no server touches the job at any point.
Transparency survives
The picture inside an ICO is a PNG, with its alpha intact. So a round logo keeps its clear corners.
Sizes that make sense
The menu lists the sizes real icons actually use. Instead of photo widths, you get 16 through 256.
The full set of sizes in a single run
Queue every product logo you own and let it run. Then the page writes the zip itself, with no server.
Nothing to join
No login, no credit system and no limit per day. Since the header is written on your hardware, there is no usage to bill for.
Making An Icon That Reads
A favicon gives you sixteen pixels of space. So every choice you make counts twice as much.
- Drop the fine detail. A full logo turns to mush at this size. Instead, use one letter or one simple shape.
- Feed it a square. An icon is square by definition, so a wide logo gets awkward. Therefore crop to a square before you start.
- Start from a vector. Draw the SVG at 256 first, then wrap that. So every size stays crisp rather than soft.
- Test it against both themes. A dark mark vanishes on a dark browser bar. Above all, check it on white and on black.
- Use 32 for the tab. Modern browsers pick 32 and scale it down neatly. So one file usually covers the whole job.
- Keep the name simple. Most software still looks for favicon.ico in the root. Rather than fight that, just rename the download.
Three Icon Mistakes
These three turn a sharp mark into a smudge. Every one of them is quick to put right.
Renaming a PNG instead
Changing the ending fools some browsers and not others. So wrap it properly, and every one of them agrees.
Using the full logo
Words and thin lines disappear at sixteen pixels. Therefore cut it back to a single bold shape.
Requesting a larger size than the source provides
The menu never stretches a small picture upward. Instead, start from artwork at that size or larger.
PNG And ICO Questions
Does the Denwix converter upload my logo?
No. This PNG to ICO converter holds no fetch, no XHR and no form post. Your browser redraws the picture and writes the container in the same tab. So nothing ever travels.
Does the file hold several sizes?
No, it holds one. An ICO can carry a set, though this page writes a single size per file on purpose. So run the batch again for each size you want.
Why can I not go above 256?
Because the header stores each side in one byte. One byte reaches 255, and a zero there means 256. So the format itself caps the icon at 256 pixels.
Which icon sizes belong in the ICO file?
Use 32 for a website favicon, since browsers prefer it and scale down well. Pick 48 for Windows shortcuts. However, 16 is still the smallest a tab will show.
Does the see-through background stay see-through?
Yes. The picture inside the container is a PNG, so its alpha channel travels with it. Therefore a round or cut-out mark keeps its clear corners.
Can I feed it a JPG or an SVG?
Yes, both work, along with WebP, GIF and BMP. The tool redraws whatever it reads before wrapping it. So a vector gives the sharpest result of all.
Further Tools to Polish Your Site
All of them share the same simple routine. So not one asks for an account, an upload or a payment.
Image Converter
One page, seven formats in and three formats out.
Open tool →SVG to PNG Converter
Draw the vector at 256 before you wrap it.
Open tool →Image Size Finder
Check the width and height of the artwork first.
Open tool →
Ready To Make That Favicon?
Add the artwork, pick a size, then convert. It takes seconds, it costs nothing, and your logo stays on this device.