or drop a file anywhere here
Files other than PDF are converted first. Signing in raises the size limit.
Check PDF tests a document against one condition and tells you whether it holds. You add a PDF, type the name of a check and, for most checks, a value to compare against. The answer downloads as a JSON file with two entries: check, which repeats the name you typed, and pass, which is true or false. Six checks are available: contains_text, contains_image, page_count, page_size, file_size and page_rotation. The document itself is only read. One check runs without an account. If you want the actual number or detail and not a verdict, use Analyze PDF or Get PDF Info.
The contains_text check tells you whether the text in the Value box appears in the document. The contains_image check tells you whether the PDF holds an image, and it needs no value. Both read the Page numbers box, which starts as all.
With page_count, type a whole number in Value. The tool compares the number of pages in the document with it, using Equal unless you type another word in Comparator.
The page_size check takes a standard size name in Value: A0 to A6, LETTER or LEGAL. The page_rotation check takes a rotation number such as 0 or 90. Both look at the first page only, whatever the other pages are, and both compare with Equal when Comparator is empty. page_size compares page area, width times height, so Greater and Less ask whether the page is larger or smaller than the named size.
The file_size check compares the size of the PDF with the number in Value, counted in bytes. Its default comparator is Greater, so an empty Comparator asks whether the file is larger than your number.
| You want to know | Check | Value |
|---|---|---|
| Does the PDF mention a word or a phrase | contains_text | The text to find. Page numbers can limit where to look. |
| Does the PDF hold a picture | contains_image | Leave it empty. |
| How many pages does it have | page_count | A whole number, with Comparator Equal, Greater or Less. |
| Is the first page a standard size | page_size | A0 to A6, LETTER or LEGAL. |
| Is the file bigger than a limit | file_size | A number of bytes, with Comparator Greater. |
| Is the first page rotated | page_rotation | A rotation number such as 0 or 90. |
Drop the PDF on the upload box or pick it with Choose file.
Type a check name in Check, for example page_count, and the number or text to compare in Value. Comparator and Page numbers are optional.
Press Run Check PDF, then choose Download. Open the JSON file and read the pass entry.
A check gives you a decision, not a report to read through. The answer file holds two entries, so a script can branch on pass without parsing anything else. The six check names are printed under the Check box, and a hint under Value says what kind of entry it expects. One check runs without an account, the PDF reaches indox over HTTPS, and on the free tier the files from a check are deleted automatically within 24 hours after the job finishes. Read the limits before you rely on a false answer, though. This page explains when false means no and when it means a box was filled in wrongly.
| What you see | Why | What to do |
|---|---|---|
| pass is false and the file looks right | page_size and page_rotation test the first page, and Equal needs matching measurements | Try Greater or Less, or read the exact sizes with Get PDF Info. |
| contains_text is false for words you can see | A scanned page has no text layer | Run OCR PDF first, then check the searchable copy. |
| The job ends with an error | The check is not one of the six, the comparator is not Greater, Equal or Less, or a number check got letters | Correct the entry and run it again. |
| pass is false and Value was empty | An empty Value compares against 0, or against A4 for page_size | Fill in Value. |
| You want more than a yes or no | A check answers one question per run | Use Analyze PDF or Get PDF Info. |
A workflow should continue only when a file meets a rule, such as a set page count. The pass entry gives the script a clean true or false.
You need to know whether a contract mentions a certain name or clause before you file it. The contains_text check answers that without a read through every page.
A job sheet calls for LETTER pages with no rotation. Run page_size and then page_rotation to confirm both before the file goes to the press.
Facts checked on October 16, 2026
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Six: contains_text, contains_image, page_count, page_size, file_size and page_rotation. Type the name in the Check box exactly as written here, with the underscore.
It is a JSON file with two entries. The check entry repeats the check name, and the pass entry is true or false.
You can leave it empty. The default is Equal for page_count, page_size and page_rotation, and Greater for file_size. If you type one of those words yourself, keep the capital first letter.
It depends on the check: the text to find for contains_text, a whole number for page_count and page_rotation, a number of bytes for file_size, and a size name such as A4 or LETTER for page_size.
First rule out a form mistake. An empty Value can produce false with no error. For page_size, Equal needs an exact match in measurements, so a near match fails.
Look for an entry the tool could not understand: a check name outside the six, or letters in Value where a number check needs digits. Select Try another, add the file and correct the entry.
No. You get only the JSON answer. The tool does not return the PDF, edit it or sort it anywhere.
No, a single check runs without one. Your PDF is sent over HTTPS. Free-tier files, the upload and the answer alike, are removed automatically within 24 hours of the job finishing.