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Compress Image to Specific KB Online

Enter any custom target file size in KB and compress your photo automatically with intelligent quality balancing.

Drag & drop an image

or choose from your device

Processed locally in your browser

JPG, PNG, WebP, SVG, HEIC • Max 50 MB per file

How to Use Compress Image to Specific KB

1

Upload Image

Select the JPG, PNG, or WebP photo you need to reduce.

2

Type Desired KB Size

Input any target number of kilobytes (such as 35 KB, 75 KB, or 150 KB).

3

Download Target File

Our binary-search compressor hits your target size for instant download.

About Compress Image to Specific KB

Online recruitment portals, university admission forms, and document upload fields often specify unique file size boundaries (such as 'file must be between 30 KB and 70 KB'). Guessing slider percentages is tedious and frustrating.

Our iterative binary-search compression engine automates this completely. It evaluates canvas quantization levels across multiple iterations in fractions of a second to converge on your target KB without over-compressing.

Common Use Cases

  • Hitting strict file upload limits on state employment and civil service portals.
  • Compressing scanned identity documents to exact organizational file ceilings.
  • Optimizing media thumbnails to hit precise CDN payload budget targets.

Private & Secure Browser Processing

All processing is executed locally in your browser. Files are never transmitted or stored on remote servers.

Processed locally
No account required
No file storage
ALL TOOLS
Compress to 50 KBThe most popular preset: compress passport photos and documents to under 50 KB with clear quality.
Compress to 20 KBCompress photos and signatures to under 20 KB for official online registration forms.
Application Photo ResizerUniversal application resizer: Passport photos, ID cards, document scans & signatures with exact dimensions and KB limits.

Frequently Asked Questions - Compress to KB

How does binary-search image compression work?

The engine tests quantization levels iteratively: if an output exceeds your target KB, it lowers quality; if it is smaller, it tests higher quality, converging on the highest fidelity file that stays under your limit.

What happens if a high-resolution photo cannot reach the target KB by quality alone?

The engine will intelligently downscale pixel dimensions incrementally to guarantee the file fits within your required KB threshold.

Are my documents uploaded to a remote server?

No. The entire compression cycle executes in your web browser memory. Your files never touch external servers.