KEYSTONE App
Split a PDF, or gather images into one.
Nothing ever leaves your browser.
WAS Bangkok · Internal system
What it doesSecure access
Use your school account to continue.
Continue with Microsoft 365Access is managed by the IT team through your staff account — there is no separate password to remember. Your files are converted by your own browser either way, and are never uploaded.
What it does
01
Give the set a name and each page is written out as name-01, name-02, name-03 — as PNG, or JPG at high quality. Pick the pages you want, or take them all in one ZIP.
02
Pages that are not 16:9 are scaled up as far as they will go and centred on a black background with a small margin — so a portrait A4 fills the screen without ever being cropped.
03
The print setting renders each page at its true size at 150, 300 or 600 DPI on white — an A4 page becomes 2480 × 3508 pixels at 300 DPI, with nothing trimmed away.
04
Drop a pile of photographs and PDFs in, drag them into the order you want, and get one PDF out — on A4, A3, Letter or a 16:9 slide, one to a page or several, with page numbers if you need them.
05
A picture dragged off a website often arrives as WebP or AVIF, and then refuses to open or to drop into a document. Convert it to PNG or JPG — resizing, rotating and renaming on the way if you like.
06
A video exported from PowerPoint is often several times heavier than the screens need. It is re-encoded by your own computer to the right size for where it is going — the signage, a presentation, an email.
07
Drop in a PowerPoint and every slide becomes a 1920 × 1080 picture for the Signage app, each under 1.2 MB. You see every slide before saving, and anything that could not be drawn is named under it.