Converting a PDF from MB to KB is not a change of format; the file does not become a different kind of document. MB and KB are two scales for the same measurement, like kilometres and metres, and 1MB is 1,024KB. A 2.4MB scan is therefore 2,458KB, and if the portal allows 500KB it has to lose about four fifths of its weight. Doing that is compression, which is what this page performs.
The size box opens at 500KB because that figure sits in the middle of the 100KB to 1MB band most recruitment portals use for scanned certificates, but it is only a starting point: replace it with whatever your notice says. Press Compress and the tool tries a structural re-save, then re-compresses the photographs inside the file, then falls back to rendering pages as pictures, stopping at the first step that reaches your number.
How to use it
- Find the limit in your notice and type it into the size box in KB; if the notice says 1MB, type 1024 or switch the unit to MB.
- Drop in the PDF that is too heavy.
- Press Compress and read the result card, which reports the stage used and the finished size.
- Download the KB-sized copy and upload that one; keep the MB original for your records.
Doing the arithmetic before you type
File managers round, portals do not. A file shown as 1.5MB is 1,536KB; one shown as 3MB may be anywhere from 2,970KB to 3,120KB depending on how the manager rounds. When a notice states a limit in KB and your file reads in MB, multiply by 1,024 to see how far off you are: 850KB from 2.1MB is a reduction of about 60 percent, which a scan handles comfortably, while 100KB from 6MB is a 98 percent cut and will take the compressor into its heavier stages. The size on the result card is measured on the finished file, which is the figure the upload check sees.
What a scan loses, and what a typed document loses
A scanned certificate is stored as one photograph per page, and a colour A4 page scanned at 300 DPI runs to 1MB to 3MB. Taking such a page down to a few hundred kilobytes is routine: the JPEG quality is lowered in tested steps and the pixel size reduced only when that is not enough, and printed text remains readable well below 200KB a page. A typed and exported PDF carries its text as characters that weigh almost nothing, so a 3MB file of that kind owes its size to embedded images or loose structure, and the repacking stage alone may halve it without any picture being altered.
Frequently asked questions
- Is there a way to convert MB to KB without compressing?
- Not for a file that needs to get smaller. MB to KB is only a change of units, and the portal checks bytes. The only way for a 2MB PDF to become a 400KB PDF is for its contents to be stored more compactly, which is what compression means.
- How much smaller can a scanned PDF get?
- A phone scan usually drops by 70 to 90 percent before text becomes hard to read, since each page starts as a large colour photograph with plenty of slack. Typed documents drop less, because their text already weighs very little; the saving comes from pictures and structure.
- The result says 499KB. Why not exactly 500KB?
- The limit is a ceiling, not a target, and the compressor keeps the highest quality that fits under it. Landing a few kilobytes short is normal: the last quality step that fitted was chosen, and the next one up would have broken the limit.
- My PDF is 950KB and the form wants 1MB. Do I need this page?
- No. 950KB is under 1,024KB, so the file already fits; drop it here and the page will say so and hand the original back. If the portal still refuses it, it is probably counting 1MB as 1,000KB or objecting to something other than the size.