Guides
Practical instructions for choosing options and checking the result.
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How to merge PDFs in the right order
Combine documents, supporting evidence and appendices into an ordered copy, then check it before sharing.
Read guideHow to split a PDF into pages or ranges
Separate chapters or pages into multiple files and learn when a single extracted selection works better.
Read guideHow to extract PDF pages into one file
Save selected pages and control the order of the copy while keeping the original document intact.
Read guideHow to duplicate PDF pages without changing their order
Add copies beside their originals and distinguish extra copies from total appearances.
Read guideHow to insert blank pages into a PDF
Create dividers or note space before or after selected sheets while matching their dimensions.
Read guideHow to number a PDF while leaving its cover unnumbered
Distinguish physical sheets from visible numbers and configure the sequence on the final document.
Read guideHow to add a watermark to a PDF
Identify drafts or copies with a readable notice and understand its limits as a protection measure.
Read guideHow to add a logo or image to a PDF
Prepare a sharp image, preserve readability and apply your logo to the final document version.
Read guideHow to convert JPG, PNG or WebP images to PDF
Order photos, receipts or screenshots and choose original dimensions or A4 while preserving proportions.
Read guideHow to interleave pages from two PDFs
Rebuild double-sided scans by alternating files and correct back-side pages saved in reverse order.
Read guideHow to split odd and even PDF pages
Create alternating groups, count from the first sheet and run a test before manual double-sided printing.
Read guideHow to crop PDF margins without confusing cropping with deletion
Hide scan borders with careful measurements and understand why contents may remain inside the file.
Read guideHow to add PDF margins for notes or printing
Enlarge sheets without scaling their contents and check dimensions and interactive elements in the copy.
Read guideHow to delete pages from a PDF
Remove unwanted sheets by number or range and keep the others in their original order.
Read guideHow to rotate a PDF and save its orientation
Correct sideways or upside-down sheets and save the change in a downloadable copy.
Read guideHow to reorder PDF pages with an exact sequence
Move, repeat or omit sheets by entering the complete order of the output copy.
Read guideHow to download and save a PDF on your phone
Find the downloaded copy, save previews and open ZIP archives produced by the tools.
Read guideHow to merge PDFs on your phone
Select phone documents, order them with touch controls and save a copy without installing another application.
Read guideHow to extract a single page from a PDF
Save a receipt or specific sheet as a standalone PDF and check its physical position.
Read guideText
1 guideImages
2 guidesPNG, JPG or WebP: what changes when converting an image
Choose by content and transparency, then compare the output without assuming it will always be smaller.
Read guideHow to resize an image without distortion
Calculate proportional dimensions and distinguish changing size from cropping the frame.
Read guideCalculators
2 guidesHow to calculate percentages and percentage change
Distinguish a percentage of a quantity, a proportion between quantities and change from an initial value.
Read guideDirect and inverse proportions: choosing with worked examples
Distinguish quantities that grow together from those that move in opposite directions and verify the formula with known values.
Read guideDeveloper
3 guidesHow to validate, format and minify JSON
Recognize syntax errors and understand what the browser’s JSON parser preserves.
Read guideHow to encode and decode Base64 with UTF-8 text
Convert accents and emoji correctly and distinguish encoding from encryption.
Read guideHow to convert CSV to JSON without losing leading zeros
Choose a delimiter, preserve codes as text and check quotes and rows before exporting a table.
Read guideGenerators
2 guidesHow to generate and save random passwords
Choose length and character groups without treating a generated password as an absolute security guarantee.
Read guideHow to create and check a readable QR code
Encode text or direct links and verify contrast, margin and destination before sharing the code.
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