How do I resize an image to a specific size in KB?
Upload your image, type the size you need, for example 15, 75 or 300, in the Target KB box, and download. This KB resizer lets you resize image in KB to any number, not only fixed presets. Tick "Match target closely" if the file must be near the number, for example 95–100KB. The tool can also increase file size when a portal sets a minimum.
Why a custom KB resizer?
Most tools offer only a few fixed sizes like 20KB, 50KB or 100KB. Real forms are not that tidy. You will see rules like "between 30KB and 70KB", "maximum 150KB", "not more than 1MB" or "minimum 10KB". A custom KB size tool lets you hit any of these numbers directly, without guessing.
It works for photos, scanned documents, screenshots and graphics. Because everything happens on your device, it also works for private documents such as ID cards and certificates.
Reduce or increase image size in KB
| You need | What to do | How it works |
|---|---|---|
| Smaller file (e.g. 2MB → 80KB) | Type 80 in Target KB | Finds the best JPG quality that fits, and lowers resolution only if needed |
| File inside a range (e.g. 30–70KB) | Target 70, Minimum 30 | Keeps the result between both limits |
| Close to a number (e.g. ~100KB) | Target 100 + "Match target closely" | Result lands between 95KB and 100KB |
| Bigger file (e.g. 8KB → 20KB) | Target 20 + "Match target closely" | Raises quality, then adds a harmless padding block inside the JPG |
Increasing KB does not add real detail. A blurry image stays blurry. It only helps when a portal rejects a file for being "too small".
Steps to change image size in KB
- 1Upload the image
JPG, PNG, WebP, GIF and BMP are accepted. Drag and drop or paste also works.
- 2Type the target KB
Use the number box for exact values or the presets for common sizes.
- 3Set dimensions if your form asks
Keep the natural size, or choose pixels or cm for a fixed width and height.
- 4Check the status and download
The green ✓ Valid pill confirms the size is inside your limits.
KB, MB and pixels explained
- 1 KB = 1,024 bytes. 1 MB = 1,024 KB. So a "1MB limit" means about 1,024KB.
- Pixels are the width and height of the picture. Fewer pixels usually means fewer KB.
- JPG quality controls how strongly the image is compressed. This tool adjusts it automatically.
- Some portals count 1MB as 1,000KB. To be safe, aim slightly below the limit, for example 980KB for "1MB".
Read more about how kilobytes are counted.
Tips for accurate results
- Very small targets need small pixel sizes. A 10KB photo should be around 200–300 pixels wide.
- Use JPG for the most precise KB control. PNG is lossless and can only shrink by reducing pixels.
- Exam photo or signature? Ready presets are on the SSC Photo Resizer, SSC Signature Resizer and Photo to 20KB pages.
- Many images at once? Use the Free Image Compressor with a target size.
- PDF instead of an image? Use Compress PDF to 200KB.
Frequently Asked Questions
How do I resize an image to a specific KB?
Upload the image on the PhotoKB KB Resizer, type the target KB and download when the status shows Valid.
Can I increase the file size in KB?
Yes. Tick Match target closely. The tool raises quality and, if needed, adds a harmless padding block to reach the size.
Can I set a KB range like 30KB to 70KB?
Yes. Type 70 as the target and 30 in the Minimum box.
Will the image lose quality?
Only as much as needed to fit. The tool always uses the highest quality that fits your KB value.
Does it work for PNG?
Yes, but PNG can only shrink by reducing pixels. Choose JPG for the most precise KB control.
Is my image uploaded?
No. Everything is processed on your device.
About this tool
Built and maintained by the PhotoKB Editorial Team. We test every tool with real phone photos, scans and PDFs before each update. Exam and portal values are based on public official notifications. PhotoKB is not linked to any exam body, so always confirm current rules on the official website. Last updated: 8 November 2026.