Blog
Original guides that explain the methods, formats and limits behind Lutrakit tools.
Blog
How Lutrakit processes files in your browser — and how to verify it
See how Lutrakit keeps selected file bytes in the browser and reproduce a Network-panel no-upload check.
Merge PDFs safely: order, file size, bookmarks and verification
Merge ordinary PDFs in a deliberate order, then check page count, bookmarks, forms, signatures and file size.
A visual PDF signature is not a digital certificate
Understand when a visible mark may be useful, why it is not a digital certificate and what to check in the saved PDF.
Extract PDF text: embedded text, scans, and OCR limits
Learn when a PDF already contains extractable text, why scans need OCR and how to verify the exported text.
Cut, merge, and retime audio without avoidable quality loss
Reduce avoidable quality loss when cutting, joining or retiming audio, and learn what to verify before sharing the result.
Weighted grades and GPA: formulas, scales, and worked examples
Check weighted-grade and GPA formulas, examples and scale limits before using the result for a real decision.
What a tournament probability estimate can — and cannot — tell you
Understand what tournament simulations estimate, where uncertainty enters and why official event rules still control.
Calendar quarters and manual fiscal-quarter formulas
Use calendar quarters directly and calculate fiscal quarters manually when an organization uses a different 12-month year.