ToolnozaWhen cropping is useful
Cropping a PDF changes the area that a viewer shows; it does not rewrite every object on the page. This makes it useful for trimming excessive white margins before reading, printing or placing pages in a presentation. It is not a security operation.
A practical A4 example
An unrotated A4 sheet is 210 × 297 mm. To leave a visible rectangle of 190 × 277 mm and remove a 10 mm border on all sides, set left = 10 mm, bottom = 10 mm, width = 190 mm and height = 277 mm. Before applying the crop, check that the entire content lies within those dimensions. The same rectangle is applied to every page by the current Toolnoza crop tool.
Step-by-step
- Open the tool and upload a PDF no larger than its stated 30 MB limit.
- Identify the page dimensions and check whether the document mixes A4, Letter or rotated pages.
- Enter the rectangle coordinates in millimetres, measured from the page's lower-left reference.
- Create the PDF and inspect the first, middle and last pages at normal zoom.
- Print a test page if exact margins matter.
Crop versus redact
Text and graphics hidden outside the visible crop rectangle may still exist in the PDF structure. Someone using another editor might reveal them. For confidential material, use a dedicated redaction workflow that actually removes sensitive content, and verify the result.
Mistakes to avoid
Do not assume all scans have identical page size. Cropping can clip headers, footers, signatures and page numbers. Rotation complicates coordinate interpretation; run a small test first.
Frequently asked questions
Does cropping reduce PDF file size? Not reliably. Invisible content can remain stored.
Can I crop several pages at once? Yes, Toolnoza applies one rectangle to every page; use a more flexible editor for per-page crops.
Is it safe for private documents? Toolnoza describes this operation as browser-local, but you should still review the downloaded output before sharing.