If you've ever tried to upload a photo to a government job portal or an exam application form, you already know the pain - "file size must not exceed 20KB" is a sentence that ruins a perfectly good afternoon. Most phone cameras shoot photos at 2-4MB, so you're not just trimming the file a little, you're shrinking it by roughly 99%.

Here's the thing most people get wrong: they assume there's one magic setting that works for every target size. There isn't, really. A 10KB target and a 50KB target behave pretty differently, and knowing that up front saves you a lot of re-uploading.

Why these targets are so small in the first place

Older government systems and some legacy portals were built years ago, when server storage was expensive and bandwidth was slow. The limits never got updated even though everyone's phone now shoots in 12+ megapixels. So you're stuck compressing a modern photo down to a size that would've been normal for a 2008-era webcam.

Getting to 10KB

This is the tightest target you'll usually see, and it almost always means visible quality loss - that's just physics. What helps: crop tightly to just the required area first (passport photos especially - don't leave a ton of background), since fewer pixels means the compressor has less to throw away. Then compress gradually rather than dragging straight to the lowest setting; stop as soon as the file hits 10KB rather than going lower than you need to.

Getting to 20KB or 50KB

You have noticeably more room to work with here. At 50KB in particular, most passport and ID-style photos still look clean and professional after compression, as long as you're not starting from an enormous original. If your photo still looks soft or blocky at 50KB, the usual culprit is a dimension that's way bigger than it needs to be - resize it down to roughly the pixel dimensions the form actually asks for before you compress, rather than compressing a huge image and hoping for the best.

A quick way to do all of this

Our Image Compressor has a live slider and shows your file size updating in real time as you drag it, so you can watch the number drop and stop the exact moment you hit your target - no guessing, no re-uploading five times. It runs entirely in your browser too, so nothing gets uploaded to a server in the process.

If the form specifies exact pixel dimensions as well as a file size (a common combo on Bangladesh job and exam portals), it's worth resizing first with a dedicated resizer and then compressing - we cover the exact combinations to use in our guide to resizing photos for job and exam forms.

And if it's specifically a PDF you're trying to shrink rather than an image, the same logic (crop/resize first, then compress gradually) applies - see our PDF compression breakdown for the document version of this problem.