Compress a PDF to 500 KB or less
Half a megabyte is a small limit, but a reachable one for a one or two page file, and this page tells you plainly when it can be reached and when splitting or converting to an image is the right road instead. Drop the file into the tool, pick the strong level, and read the size before and after. All of the compression runs inside your browser and the file is never uploaded to a server.
Drop your files here
Files are processed on your device and never uploaded
Runs in your browser. Your file never leaves your device.
You can process several files at once, up to 3.
"File size is too large. The file must be less than 500 KB"
This message, and its siblings that say 512 KB or 0.5 MB, appears in attachment fields designed for a personal photo or a single-page document: an ID card, a birth certificate, a receipt. The portal will not shrink the file for you; it rejects it and waits for a smaller one. The number is small because the field was never meant for a multi-page file, which is the first question to ask: does the office want one specific page? Usually yes, and sending only that page solves half the problem before any compression happens. The tool above shows the current size when you drop the file, and the new size with the percentage saved after every run.
Realistic expectations: what reaches 500 KB and what does not
Compression works on the images inside a file, so scans and phone photos are what shrink, while a pure text file is small to begin with and barely changes; it is usually under 500 KB from the start. A clean one or two page scan reaches 500 KB at the strong level in most cases, since a page comes out between roughly 100 and 300 KB. A twenty-page scan usually does not get there whatever you do, because twenty pages in half a megabyte means 25 KB per page, which does not leave a legible document. In that case split the file with the split tool, extract only the pages you need, and compress the result. The standing rule: go back to the original on every attempt, and never compress an already compressed copy.
Target 300 KB
Three hundred kilobytes is a common cap on fields for photographed documents. A single page of a clean black-and-white scan, or a phone photo of a printed document, usually reaches it at the strong level. Two pages may reach it when the content is printed text on a white background; three pages rarely do. If the file is still over the limit after strong, the problem is the page count or a high-resolution colour picture, and the fix is extracting the one page you need. Remember that medium and strong re-render pages as images, so the text stops being selectable; that does not matter in an attachment field, but it matters for a CV that a system reads automatically.
Target 200 KB
At two hundred kilobytes we are talking about a single page. A clear printed document, photographed in good light or scanned, reaches 200 KB at the strong level in most cases. What usually gets in the way is a colour picture with a dark background, a page carrying a large portrait photo, or a very high-resolution scan of a page full of fine detail. If your file has several pages, the only road is splitting it and sending each page as its own file where the portal allows. And check the result after compressing: small digits and stamps are the first to lose legibility at this limit.
Target 100 KB
One hundred kilobytes is the lowest cap you will see on an online field, and it is normally asked of a personal photo or a small document. For a single clear page of printed text, strong compression usually gets there. For a multi-page file, very rarely, and the better route is extracting the page you need and compressing that alone. If the field is for a personal photo, it is better not to start from a PDF at all: use the photo itself after reducing it in the phone's settings. Do not expect fine digits to stay readable at 100 KB on a crowded page, so check them before uploading.
When the portal wants a 500 KB image, not a PDF
Many fields that quote a limit in kilobytes accept images only, JPG or PNG, and refuse a PDF. Compression does not help there. Convert the page you need to an image with the PDF to images tool, choose JPG at normal quality for the smallest file, and upload the resulting picture in the field. Everything above, whether compressing or converting, runs inside your browser on your own device: the file is not uploaded to any server and there is no copy on our side, which is what an ID photo or a personal document deserves.
Related pages
Three steps, that's it
Drop the PDF into the tray, ideally one or two pages
Pick the strong level, compress, and compare before and after
If it is still over the cap, extract the page you need with the split tool and compress again, then download
Frequently asked questions
Can I get down to 100 KB?
For a single clear page, usually yes at the strong level. For a multi-page file, rarely; the better route is extracting the page you need and compressing it on its own.
Why does my file not shrink however hard I compress it?
Compression works on the images inside the file. A pure text file is already small and will not shrink much, while a file of dozens of scanned pages needs splitting, not compressing.
Does the quality drop?
Yes, at the medium and strong levels, and the text becomes an image. Check the result; if the digits are not legible, use a lighter level and split the file instead.
Is the file uploaded?
No. All of the compression happens inside your browser.
The portal wants a 500 KB image, not a PDF. What do I do?
Convert the page to an image with the PDF to images tool, then upload the resulting picture in the required field.
