How to compress a PDF for an online application form
By Kiril UrbonasLast updated: 2 min readOptimize PDF
To get a PDF under an application form's size limit, open Compress PDF, switch to “To target size”, enter the limit in KB and download the result. PDFER keeps the best quality that fits, entirely on your device — useful because these forms usually want ID scans, certificates and payslips you shouldn't upload to a random converter.
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Quick steps
- 1Open Compress PDF and add your document.
- 2Choose “To target size” and enter the form's limit in KB.
- 3Click Compress PDF.
- 4Check the final size and readability, then upload the file.
Typical upload limits
Exam, government-service and scholarship portals often allow 50–200 KB per document. University and visa applications commonly accept 200 KB to 1 MB. Job sites and applicant-tracking systems usually allow 1–5 MB for a CV.
There are ready-made presets for the most common limits: Compress PDF to 100 KB, 200 KB, 500 KB and 1 MB.
Make the file easier to shrink
Every page shares the size budget, so first remove pages the form doesn't ask for with Remove Pages. Crop scanner borders with Crop PDF, and convert colour scans of black-and-white documents with Grayscale PDF.
If the form accepts several files, Split PDF lets you upload a long document in parts that each fit the limit.
Check the result before you submit
The download panel shows the final size. Open the file and zoom in on small print such as ID numbers — if it's too blurry, raise the limit slightly or drop more pages and try again.
Tools mentioned in this guide
Frequently asked
- Why does the form still reject my file?
- Some portals measure in decimal kilobytes (1 KB = 1,000 bytes) or include overhead. Set the target 5–10% below the stated limit to be safe.
- Can a form tell that my PDF was compressed?
- No. A compressed PDF is a normal PDF; it only contains smaller images.
- Is it safe to compress ID documents here?
- Yes. Compression runs in your browser and the file is never uploaded, so the ID stays on your device.
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