How to Compress a Photo to 20 KB or 50 KB for Online Forms

Why a phone photo is so far from 20 KB

A photo from a modern phone is usually several megabytes, made of millions of pixels. A 20 KB file is more than a hundred times smaller. Two things decide the size of a JPEG:

• Pixel dimensions. Fewer pixels means less to store. Halving the width and height leaves a quarter of the pixels.
• Quality. JPEG throws away fine detail to save space. Lower quality means a smaller file, and eventually visible blocks.

If you only lower the quality of a full-size photo, it turns blocky long before it reaches 20 KB. Shrinking the pixels first lets you keep the quality high. Forms show your photo small anyway: IBPS, for example, prefers a photo of just 200 × 230 pixels.

Step by step

1. Crop to what the form needs. For a passport-style photo, your head and shoulders; for a signature, just the signature with little white space. Use Crop image.
2. Make it smaller in pixels. If the form gives pixel dimensions, use them. If not, a width of 300 to 600 pixels is plenty for a form photo. Resize image keeps the shape, so nothing is stretched.
3. Compress to the target. Open Compress image for 20 KB or Compress image for 50 KB, or type any other limit. Pick your photo and it saves the best quality that fits.
4. Check the result. Zoom in. Your face, or every stroke of the signature, should be clear. If it looks blocky, go back to step 2 and use fewer pixels.
5. Check the minimum too. Many forms also set a lower limit, such as 10 KB or 20 KB. A file below it is rejected just like one above the maximum.

Applying for SSC, UPSC, IBPS or NEET? Exam photo resizer has presets that crop to the exact pixels and land between the minimum and maximum KB in one go. See our guide to photo and signature sizes for exam forms for the official numbers.

Tips for a small file that still looks good

• Plain background. A white wall compresses to almost nothing; a patterned curtain eats the KB you want for your face.
• Good light. Dim photos are grainy, and grain is detail the compressor has to store.
• Signatures are easy. They are mostly white, so a signature fits in 10–20 KB at good quality. Sign in dark ink on plain white paper.
• JPEG for forms. Most Indian government and exam portals want JPG or JPEG. Convert iPhone HEIC photos with HEIC to JPG first.
• Keep the original. Compress a copy each time; compressing an already-compressed file again loses more detail.

Need a PDF under a limit instead? See how to reduce a PDF’s size for online forms.