Compress PDF to 40 KB
Shrink PDF file size while keeping the best quality possible.
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How to compress a PDF to 40 KB
40 KB sits just under the common 50 KB cap, and some application forms use it for a single certificate or ID page. This page is set to 40 KB, so a file that passes here also passes a 50 KB limit.
Add the PDF with the single page you need.
Leave 40 KB in the size box.
Click Compress PDF and download the file once the note says it fits.
Just under the 50 KB mark
Limits of 40 KB are rarer than 50 KB ones and usually appear where a form wants one small document: an ID card copy, an admit card, a one-page certificate. The practical difference from 50 KB is small but real. A page that needed only a quality reduction to reach 50 KB may need its image scaled down a step to reach 40, so fine print gets slightly softer.
Use this page when 40 KB is the stated maximum. If your form says 50 KB, the 50 KB page keeps a little more detail and is the better choice. A 40 KB file passes either limit, but there is no reason to give up sharpness the form would have accepted.
Two-sided cards and small documents
ID cards are often wanted as front and back in one PDF. Two scanned sides in 40 KB works when both are cropped to the card edge and scanned in greyscale or black and white; a full colour scan of both sides usually comes out soft. Check the card number and the date of birth at full zoom before uploading. If they are not readable after compression, see whether the form has a separate field for each side and upload them as two files.
Compress PDF to 40 KB FAQ
A little. You have a fifth less room, which on a scanned page usually means slightly softer text, not a failure. Cropping the margins first with Crop PDF wins most of that back.
Two scanned sides in 40 KB is tight. It works best in black and white with both sides cropped to the card. If the text turns soft, check whether the form takes each side as its own file.
No. The tool runs entirely in your browser, so your files are processed on your own device and never leave it.
Yes. Every PDFCraftly tool is free, with no sign-up, no watermark and no email required.
Guides
- USCIS File Too Large? Compress a PDF Under 12 MB for Evidence UploadsUSCIS online accounts reject evidence files over 12 MB and password-protected PDFs. How to shrink a scan under the limit without uploading it anywhere.
- CEAC Document Upload: Get NVC Scans Under the 4 MB File Size LimitThe State Department's CEAC portal takes immigrant visa scans up to 4 MB each, in color, as PDF or JPG. How to compress an I-864 or civil document to fit.
- Compress a PDF for a UK Visa Application: UKVCAS, VFS Global and TLScontact Upload LimitsUKVCAS takes PDF, JPG and PNG files up to 7.25 MB each; VFS and TLScontact show their limit on the upload page. How to shrink visa documents to fit.
- Compress a PDF for a UK University Application: 2 MB, 4 MB and 5 MB Portal LimitsLSE and Edinburgh cap each upload at 2 MB, Oxford at 4 MB and UCL at 5 MB. How to compress transcripts, certificates and references to fit each portal.
- IRCC File Size Limit: How to Compress a PDF Under 4 MB for Your UploadIRCC accepts 4 MB per file in most online accounts and 5 MB in the IRCC Portal, one file per field. How to compress and combine PDFs to fit.
- ImmiAccount Attach Documents: How to Compress a PDF Under 5 MBImmiAccount accepts documents up to 5 MB each and up to 60 per person, and rejects encrypted PDFs. How to compress, merge and unlock files to fit.
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