Image
Image Checker
Upload an image and check dimensions, aspect ratio, file size, DPI, metadata and common social media or SEO image requirements in your browser.
Image sizeSocial mediaDPIMetadata
Open image checker Live tools only
Online checker tools ready to use
This directory lists only live checkers on CheckToolkit. Filter by category, open the tool you need, and follow related links from each tool page.
Find a Tool on CheckToolkit
Explore 5 CheckToolkit checker tools. Search by keyword or filter by category to find the right tool faster.
Passport photos
Passport Photo Size Checker
Upload a passport or visa photo to pre-check dimensions, aspect ratio, file size, background cleanliness, head centering, face size and crop fit for common photo presets.
Passport photoVisa photoPhoto sizeCrop check
Open Passport Photo Size Checker Image
Profile Picture Safe Zone Checker
Upload an avatar, logo or portrait to preview circular crops, square avatars, 32 x 32, 48 x 48 and 96 x 96 sizes, safe-zone padding and dark or light backgrounds.
AvatarSafe zoneCircle cropSmall preview
Open Profile Picture Safe Zone Checker Web and SEO
JSON Checker
Paste JSON to format readable output, minify compact output, validate syntax errors and copy the result in your browser.
JSONFormatterMinifierValidator
Open JSON Checker Web and SEO
Favicon & App Icon Checker
Upload a logo, favicon, app icon or PWA icon to check square shape, dimensions, transparency, file size and common favicon, Apple touch, PWA and Android icon needs.
FaviconApp iconPWAApple touch
Open Favicon & App Icon Checker Tools FAQ
What can I check with CheckToolkit?
CheckToolkit helps you check practical details before you upload, publish or send something. Current tools focus on image checks such as dimensions, aspect ratio, file size, DPI, metadata and common publishing requirements.
Are CheckToolkit tools free to use?
Yes. The tools listed here are free to use and do not require an account.
Does CheckToolkit store my uploaded files?
When a check can run in your browser, CheckToolkit keeps the file on your device. Each tool page explains what it needs to read and whether any network request is required.
How do I find the right CheckToolkit checker tool?
Use the search box to look for a task, file type or requirement, or filter by category such as image, passport photos, or web and SEO.
Can CheckToolkit results replace official requirements?
No. CheckToolkit is meant to catch common issues earlier, but the final standard is still the requirement from the platform, school, client, visa center or other official source.
Why does CheckToolkit have only a few tools in some categories?
CheckToolkit adds tools when they can solve a real task clearly. The directory avoids placeholder pages, so new checker tools appear as they become useful.
Need another check?
Jump back to the tools directory and choose the checker that matches your next task.