Zenn / Free tools / Logo checker
Logo checker: is your logo ready for print, web and social?
Upload your logo and get an honest report card in seconds: print size, vector or pixels, colours, gradients, how it reads at favicon size and on dark backgrounds. Free, and your logo never leaves your device.
Score
Everything happens on your device. Nothing is uploaded.
Your logo shows here
Fix it all at once. Upload this logo to Zenn and get it back on business cards, social posts and a brand guide, or start a fresh logo that comes with every file: PNG, SVG, PDF, EPS, a stacked version, a symbol and favicons.
What makes a logo work everywhere
A vector master
Keep an SVG, PDF or EPS. It prints sharp at any size, from a pen to a shopfront sign.
Two to four colours
Fewer colours print cheaper, embroider cleanly and stay recognisable in one colour.
A version for small spaces
A symbol or initials on their own for favicons and round profile pictures, where a long name turns into a smudge.
Light and dark versions
One for white paper, one for dark photos and coloured backgrounds, plus a one-colour version for stamps and engraving.
How big will my logo print?
Printers want 300 pixels per inch. Divide your logo’s width in pixels by 300 to get the widest it prints sharp, in inches. Vector files have no limit.
| Width in pixels | Prints sharp up to | Good for |
|---|---|---|
| 500 px | 4.2 cm (1.7 in) | Websites, email signatures, small business cards |
| 1,000 px | 8.5 cm (3.3 in) | Business cards, letterheads, social media |
| 2,000 px | 17 cm (6.7 in) | Flyers, brochures, packaging |
| SVG, PDF or EPS | Any size | Signs, vehicles, embroidery, merch |
Want a logo that passes every check?
Zenn designs logos for your business name in seconds, with symbols made by a real design studio. Premium includes true vector SVG, PDF and EPS files, a stacked version, a symbol on its own and favicons, and the Brand kit adds business cards, social posts and a brand guide.
Questions
What does the logo checker test?
Eight things printers, websites and social networks care about: whether the file is a vector or pixels, how big it prints sharp at 300 dpi, whether the background is transparent, how many colours it uses, gradients and shading, how it reads at 16 px as a favicon, whether it fits a round profile picture, and its contrast on light and dark backgrounds.
Is my logo uploaded anywhere?
No. The checks run inside your browser. Your logo never reaches Zenn’s servers, and closing the tab clears it.
What resolution does a logo need for print?
Printers work at 300 pixels per inch, so a logo 1,000 px wide prints sharp up to about 8.5 cm (3.3 in) wide. For anything bigger, such as signs, banners or vehicles, you need a vector file: SVG, PDF or EPS.
Why does my logo need a vector file?
A PNG or JPG is made of pixels and blurs when it’s enlarged. A vector file is made of shapes, so it stays sharp at any size and printers, signmakers and embroiderers can work with it. If you only have a PNG, Zenn’s free PNG to SVG converter can trace one.
How many colours should a logo have?
Most strong logos use two to four. Every extra colour costs more on screen printing, embroidery and signs, and makes the logo harder to recognise in one colour.
Why does my logo look bad as a favicon or profile picture?
Favicons are 16 px and profile pictures are circles. A long name shrinks to a smudge in both. Use a symbol or your initials on their own for small spaces, and a stacked version (symbol above the name) for round crops.
How accurate is the score?
It’s a quick, automatic check of the file, not a judgement of your design. It measures things a printer or developer would look at first. A designer may still spot things a script can’t, such as spacing or how well the logo suits your business.
Can Zenn fix my logo?
Yes. Upload it to Zenn’s Brand kit and it goes onto business cards, social posts and a brand guide in its own colours. Or make a new logo at zenn.com: Premium includes true vector SVG, PDF and EPS files, a stacked version, the symbol on its own and favicons.