Two different jobs hide behind the words resize PDF. One is the file’s weight in KB or MB, which an upload field checks. The other is the paper size of the pages, A4 or Letter, which printers care about. This page does the first job only: it brings the file under the figure you type, and every page keeps the width and height it had.
If the paper size is the problem, no compressor can help. Open the document, choose Print, pick A4 or Letter as the paper, tick fit to page, and send it to the PDF printer that Windows and macOS include. The saved copy has the new page size; return here only if it is also too heavy.
Before and after
scan-2-pages.pdf
2 pages303 KBPDF
scan-2-pages-compressed.pdf
2 pages199 KBPDF
This 2-page scanned PDF was 303 KB. With the limit set to 200KB, it came out at 199 KB, which is 34% smaller.
Only the photos inside the file were re-compressed. The pages keep their size, and any text in the file stays selectable.
The numbers are from a real run of the tool above. The pictures are previews of the first pages of the actual files.
How to use it
- Find the figure in the notice or the error message and note whether it says KB or MB; 1MB counts as 1,024KB here.
- Type it into the size box with the matching unit. If the form sets a lower bound too, switch on the minimum and enter it.
- Add the PDF and press Compress. The card names the stage used and shows the weight before and after.
- Download the copy, check its size in your file manager, and upload it.
One notice, two measurements
Many notices put both measurements in one line, which is where the confusion starts. The Institute of Banking Personnel Selection (IBPS) asks for certificate scans in its CRP PO/MT-XV 2025 application as a PDF of “A4 page size” with a maximum of 500KB. That is two rules: the A4 part is settled by the scanner app or the print dialog before the file exists, and the 500KB part is settled here.
Other bodies state the weight alone. The Tamil Nadu Public Service Commission (TNPSC) says of supporting documents: “if PDF, ensure size is less than 200kb”. The National Testing Agency (NTA) wants NEET (UG) 2026 certificates as a “pdf between 50 kb to 300 kb”, a range with both a floor and a ceiling. Those numbers are what the size box is for; a notice that mentions only a paper size is answered by the print route above.
What the three stages do to a typical file
Take a 6MB offer letter exported from a word processor. The first stage rewrites the internal structure and drops the objects nothing refers to; such a file often drops to a few hundred kilobytes, every character stays selectable, and the card reads structure only. Now take a 4MB phone scan of a two-page certificate against a 200KB limit. Repacking saves little, because the weight is in two large photographs, so the second stage re-saves each page picture at lower JPEG quality, then at a smaller pixel size if lowering quality is not enough on its own. The card reads photos re-compressed, text kept.
The third stage is the one to watch for. A twelve-page colour scan asked to fit 100KB cannot get there by squeezing its pictures, so every page is drawn afresh as one image and those images are assembled into a new PDF, up to 150 pages. Each page keeps its size in centimetres, but the words are now pixels and cannot be copied or searched. The card calls this pages saved as pictures; if it appears on a document whose text matters, raise the figure where the form allows, or split the file and upload the parts.
Page count is not file size
The weight is often guessed from the page count, and the guess is usually wrong. A page photographed in colour at 300 DPI can weigh 2MB to 3MB, while a forty-page typed report without pictures can weigh 300KB, because typed text is stored as characters and a scanned page as a photograph. That is why a one-page PDF can fail a 500KB field that a long one passes.
The preset pages linked below fix the common figures: 100KB, 200KB and 500KB each have a page where the number is filled in and the file is processed the moment it lands. Here the box is empty so that any figure works, including 150KB or 250KB and ranges with a lower bound.
Frequently asked questions
- Can this page change my PDF from Letter to A4?
- No. Page dimensions are copied from the original to the result untouched, in every stage. To change them, print the document to a new PDF with A4 chosen as the paper, then compress that copy here if the portal also has a KB or MB limit.
- What does resize PDF to 100KB mean in practice?
- The finished file must hold 102,400 bytes or fewer. Enter 100 in the size box with KB selected, or open the 100KB preset page. One greyscale page gets its picture re-compressed; several colour pages force the tool to rebuild the pages as images to get that low.
- Will the text still be selectable after I resize the PDF?
- Look at the stage on the result card. After the first two stages the characters are the ones the original had, so selecting, copying and searching work as before. After the third they are part of a picture, which is why the card states it plainly.
- The portal says my file is too small, not too big. Is this the right page?
- Only if the form sets a ceiling as well. For a notice that says 20KB to 500KB, enter the ceiling in the size box, switch on the minimum and enter the floor; the file is compressed if it is over and padded if it lands short. With only a floor, use the increase page instead.
- Does resizing a PDF reduce the number of pages?
- No. The page count on the card matches the original, because pages are never dropped to save weight. If a portal wants only the first two pages, remove the others with the delete pages or split tool first, then compress what is left.