Get Exact KB Image File Size (Guaranteed Method)

Short on time? Jump to Step-by-Step Workflow or try the Image Compressor Tool directly.

At a Glance#

Goal: Achieve exact target size (±0.2 KB)
Tools: Image Resizer → Image Compressor
Approach: Binary search quality adjustment
Why This Works: Reaches the goal in 5–7 tries, not 30
Ideal For: 20KB / 50KB / 80KB / 100KB exam photo limits

Instead of guessing compression levels, treat the process like narrowing a number range. Each attempt gives feedback: too large or too small. Adjust by halving the gap between your last results. This “smart search” is quick, reliable, and repeatable.

Step-by-Step Workflow#

Know the Target Range: Most exam portals accept a small range (e.g. 20–50 KB). Even if they mention EXACT 50 KB, values between 49.7–50.2 KB usually pass. Still, we’ll aim for pixel-perfect accuracy.
Start with Dimensions: Resize your image to the required pixel width × height (for example, 200×230). Larger dimensions make compression less predictable and harder to control.
Choose the Right Format: Use JPG for photos (adjust quality). Use PNG only for signatures or sharp-edged documents. Avoid converting PNG to JPG multiple times — it adds artifacts.
Use Smart Iterative Compression: Apply a binary search approach: start at mid-quality, check file size, then adjust quality up or down until you reach your target KB. It’s faster and more accurate than random guessing.
Fine-Tune Sharpness: If the final result looks slightly blurry, lightly enhance contrast or sharpness before saving. Avoid filters that increase file size unnecessarily.

Binary Search Made Simple#

Start with quality 60 → if the file is too big, lower it to 45. If it becomes too small, raise it to around 52. Repeat by halving the difference. Within a few tries, you’ll hit the exact target size.
Yeh hi smart trick hai jo time bachata hai!

When to Use PNG (Rare Cases)#

PNG is only useful for signatures or line art. For everything else, JPG works best. Signature size 10 kb me kaise kare? — Crop tightly, keep a white background, and reduce color complexity.

Common Mistakes#

Compressing before resizing dimensions
Re-compressing an already low-quality JPG
Skipping crop — extra background increases file size

Fast FAQ#

Exact 100 KB image kaise banaye? Resize first, then try quality 55–70 range.
Photo 20 KB me fix karna hai? Keep width under 400px, use smaller quality steps.
50 KB signature kaise banaye? Keep signatures below 20KB — 50KB is not needed.

Try It Now#

Open Image Resizer → set the required dimensions → export → open Image Compressor → apply the binary search method → download. Works completely offline — no upload, no privacy risk.