01
Pick a category
Start with what you need to check: an image, a form photo, a web page, a file, a DNS record, or a piece of text.
- Choose by task
- Use the tools directory
Free online checker tools
Free Checker Tools for Images, Files, Pages, and More
The right check before you upload, submit, publish, or ship. CheckToolkit puts the most useful online checkers in one place.
Quick checks for the moment before files, forms, pages and deliverables go out.
Start with the right CheckToolkit category
Pick the category that fits your current task — whether it's an image, a form photo, or a web page going live.
Images and social media
Before you upload to Instagram, Shopify, or anywhere else — confirm the dimensions, file size, aspect ratio, and metadata are actually right.
Passport and visa photos
Document photos have strict rules that vary by country and application type. Check crop, background, file size, and compliance before you print or submit.
Web pages, SEO, and Open Graph
Titles, meta descriptions, og:image, canonical tags — the details that affect how your page looks in search results and link previews. Check before you go live.
How CheckToolkit works
Pick a category. Open a checker. Put in your URL, file, or text. Get a result you can actually do something with.
02
Open the checker
Use the tool that matches the task, then upload a file, paste a URL, or enter the text it asks for.
- Follow the tool prompt
- Keep the actual requirement in mind
03
Use the result
Review the status, important details, and next step so you can fix it, submit it, export it, or move on.
The useful result is the one that helps you decide what to do next.
Open toolsCheckToolkit results tell you what to do next
Each checker gives you a clear pass or fail, the details that matter, and a practical next step — not just raw data to figure out yourself.
Clear pass or fail
See whether the input is ready, needs review, or needs a fix.
The details that matter
Dimensions, file size, metadata, tags, records, or fields are highlighted when they affect the result.
A practical next step
The result should help you decide what to resize, rewrite, remove, retry, or submit.
Browser-first when possible
When a check can run locally, CheckToolkit keeps the workflow in your browser.
Many checks, one place
Find checkers for images, files, pages, DNS records, text, and more without bouncing between one-off sites.
More tools over time
New checkers will be added around common tasks people need to verify before sending work out.
When to use CheckToolkit
Use CheckToolkit before uploads, submissions, launches, or handoffs, when one quick check can prevent rework.
Before upload
Not sure about image dimensions, aspect ratio, or file size? Check once before the platform reports an error.
UploadBefore submission
Document photos and application attachments often have format rules. Check against them before files get rejected.
SubmissionBefore launch
Unsure about page titles, OG tags, or meta information? Confirm the key details one last time before publishing.
LaunchBefore handoff
Before a client or team sees it, run through the key details quickly and avoid basic mistakes.
HandoffCheckToolkit FAQ
Practical answers about CheckToolkit results, privacy, and tool coverage.
When should I use CheckToolkit?
Use it before uploading images, submitting files, publishing web pages, or handing off content to quickly confirm dimensions, formats, metadata, tags, or other key requirements and reduce rework.
Are CheckToolkit checker tools really free?
The tools that are live today are free to use and do not require an account. If more advanced features are added later, we will try to keep the core checking capabilities free.
Does CheckToolkit store uploaded files?
Checks that can run locally in your browser are handled locally first, such as image dimensions, file size, and some metadata checks. Each tool page will explain whether it needs network processing.
Can CheckToolkit results replace official requirements?
No. CheckToolkit helps you spot common issues earlier, but official requirements from platforms, schools, visa centers, or clients remain the final standard.
Why do some CheckToolkit categories have only a few tools?
This site only lists tools that can already produce useful results. New tools will go live around real use cases over time instead of filling the directory with empty placeholders.
Find the right CheckToolkit checker before your next task
Free online checker tools for images, files, web pages, DNS records, and more — all in one place.
Pick the tool that matches what you are about to send, submit or publish.