Resize Image to KB
Compress a photo or signature to an exact KB size.
Use Resize Image to KB
How to use Resize Image to KB
- 01
Upload a photo or signature
Drop in a JPG, PNG, or WebP image — a passport photo, a scanned signature, or any picture you need to fit a size limit.
- 02
Set your target
Enter the maximum size in KB (and optional minimum). Pick a preset for common portal specs, or set exact pixel dimensions like 200×230.
- 03
Resize and download
The tool finds the best quality that fits under your limit and shows the verified final size. Download the ready-to-upload JPG.
Tested and last verified on
What pixel size is a 20 KB, 50 KB or 100 KB photo?
There is no fixed conversion. A JPG's size depends on three things together: the pixel size, how much detail the picture has, and the JPEG quality. A plain, evenly lit photo comes out smaller than a busy one with the same pixels. So rather than a formula, here is what we measured on a real passport-style photo and a scanned signature, drawn and encoded exactly the way the tool above does it.
- A 20–50 KB photo: 200 × 230, 276 × 354, 300 × 400 and 413 × 531 px all land inside 20–50 KB at good quality (75% or better). At 200 × 230 px the photo is only 17.9 KB at normal quality, under a 20 KB minimum, so the tool raises the quality until it is inside the range.
- A 10–20 KB signature: 276 × 118, 350 × 150, 472 × 157 and 600 × 200 px reach it at good quality. 140 × 60 px is too small to reach 10 KB even at 100% quality (7.0 KB): ink on white paper has very little to store. The tool then adds padding — bytes inside the file that every image viewer ignores — so it meets the minimum, and tells you it did.
- A 100 KB or 200 KB limit: most phone photos are far bigger. Keep the pixel size the notice gives (or about 600 × 600 px when it gives none) and let the tool lower the quality; at these limits the difference doesn't show.
Photo: KB by pixel size
| Pixels | Asked for by | Normal quality (92%) | Smallest – largest the tool makes |
|---|---|---|---|
| 200 × 230 px | IBPS PO, IBPS Clerk, IBPS SO | 17.9 KB | 2.1 KB – 64.4 KB |
| 276 × 354 px | CTET | 31.6 KB | 3.1 KB – 121 KB |
| 300 × 400 px | 3 : 4, small | 36.7 KB | 3.4 KB – 141 KB |
| 413 × 531 px | 3.5 × 4.5 cm at 300 dpi | 62.0 KB | 5.0 KB – 238 KB |
| 600 × 600 px | 2 × 2 in at 300 dpi | 106 KB | 7.4 KB – 384 KB |
| 600 × 800 px | 3 : 4, large | 132 KB | 8.6 KB – 468 KB |
| 1000 × 1000 px | large square | 262 KB | 15.5 KB – 895 KB |
Signature: KB by pixel size
| Pixels | Asked for by | Normal quality (92%) | Smallest – largest the tool makes |
|---|---|---|---|
| 140 × 60 px | IBPS PO, IBPS Clerk, IBPS SO | 2.8 KB | 1.0 KB – 7.0 KB |
| 276 × 118 px | CTET | 6.0 KB | 1.5 KB – 17.8 KB |
| 350 × 150 px | 7 : 3 | 8.1 KB | 1.8 KB – 25.3 KB |
| 472 × 157 px | SSC CGL, SSC CHSL | 11.7 KB | 2.2 KB – 37.8 KB |
| 600 × 200 px | 3 : 1, large | 15.7 KB | 2.9 KB – 45.2 KB |
Measured in Chrome 149 on a 960 × 1200 portrait and a 600 × 200 scanned signature; 1 KB = 1,000 bytes. Your own picture will differ — a busier photo or a darker scan comes out larger — and other browsers' encoders differ a little. The tool always shows the real size of your file before you download it. Sizes in cm are converted at 200 dpi where the notice gives no resolution.
What each exam's notice asks for
| Exam | Photo | Signature |
|---|---|---|
| SSC CGL | Captured live — no file | 10–20 KB |
| SSC CHSL | Captured live — no file | 10–20 KB |
| SSC GD | Captured live — no file | 10–20 KB |
| IBPS PO | 200 × 230 px · 20–50 KB | 140 × 60 px · 10–20 KB |
| NEET UG | 10–200 KB | 10–100 KB |
| JEE Main | 10–200 KB | 10–100 KB |
| CUET UG | 10–200 KB | 10–50 KB |
| IBPS Clerk | 200 × 230 px · 20–50 KB | 140 × 60 px · 10–20 KB |
| IBPS SO | 200 × 230 px · 20–50 KB | 140 × 60 px · 10–20 KB |
| CTET | 10–100 KB | 3–30 KB |
| UGC NET | 10–200 KB | 10–50 KB |
| CSIR NET | 10–200 KB | 10–50 KB |
Every limit is read from the exam's own notice, with the page it is on — see photo, signature and PDF size limits for Indian exams.
About Resize Image to KB
Resize a photo or signature to an exact file size in KB — 20 KB, 50 KB, 100 KB, whatever a portal demands — and to exact pixel dimensions if needed. The tool searches for the best quality that fits under your limit and shows you the verified final size. Runs entirely on your device; the image is never uploaded.
Hitting the exact size a portal demands
Anyone who has filled in an online government or exam form knows the frustration: 'Upload your photo (20–50 KB, 200×230 pixels)' and 'Upload your signature (10–20 KB)'. Miss the size window by a few kilobytes and the form rejects the file. People end up cycling through random compression websites, guessing quality settings, and re-uploading again and again until something sticks. It is one of the most common — and most irritating — small tasks in the whole online-application experience.
This tool solves it directly. You tell it the maximum size in KB (and a minimum, if the portal specifies a range), optionally set the exact pixel dimensions, and it produces a JPG that fits. Rather than making you guess a quality percentage, it searches for the highest quality that stays under your limit and then reports the verified final size, so you know before you upload that the file will be accepted.
Why an exact size is genuinely achievable here
Compressing a whole PDF to an exact size is unreliable, because a document's size is dominated by its content — fonts, vector graphics, many embedded images — and there is a floor below which it cannot go without destroying legibility. A single photograph or signature is a completely different problem. JPG compression exposes a quality dial, and the encoded size changes smoothly as you turn it. That means the tool can perform a binary search: encode, check the size, adjust the quality up or down, and repeat until it lands just under your target.
And if the smallest quality is still too large — which only happens for very tight targets on large images — the tool steps the pixel dimensions down and tries again. Because an image can always be made smaller this way, the process converges reliably. This is the crucial honesty point: unlike an arbitrary 'compress PDF to 100 KB' promise that sometimes can't be kept, a single image to an exact KB size almost always can be, and the tool proves it by showing you the real number.
Presets, privacy, and everyday uses
Built-in presets cover the specs people hit most often — a passport-style photo at 200×230 pixels and 20–50 KB, and a signature at 10–20 KB — so you can match a portal's requirement in one click and adjust from there. The exact-size mode lets you crop to fill the frame, fit inside it with white padding, or stretch, depending on what the form wants. For less strict cases, 'Keep original' or 'Fit within' simply squeeze the file under a KB cap while preserving the proportions.
Everything runs in your browser using the same image encoder that powers the rest of the site's tools, so your photo or signature — often a piece of identity paperwork — is never uploaded to a server. Students shrink exam-application photos, job seekers fit signatures into recruitment portals, and anyone dealing with visa, banking, or KYC uploads gets a file that fits on the first try. There is no account, no watermark, and no limit on how many images you resize.
Questions
Everything runs in your browser. How we keep files private
How can it hit an exact KB size when PDF compression can't?
A single image is far easier to size precisely than a whole PDF. The tool encodes the picture as a JPG at many different quality levels, homing in on the highest quality that still fits under your KB limit. Because a lone image can always be made smaller by lowering quality or dimensions, it reliably converges — and it shows you the exact final size so there is no guesswork.
Can I set exact pixel dimensions too?
Yes. Choose 'Exact size' and enter the width and height a portal requires (for example, 200×230 for a passport photo). You can crop to fill the box, fit inside it with white padding, or stretch. There is also a 'Fit within' mode that caps the dimensions without changing the aspect ratio.
What if my target is smaller than the lowest quality allows?
For 'Keep original' or 'Fit within' modes, the tool automatically reduces the pixel dimensions until it can reach your target, so it essentially always succeeds. Only 'Exact size' mode is locked to your chosen dimensions — and there, tiny targets are almost always reachable because the image is already small.
Why is the output a JPG?
JPG lets the tool dial quality up and down to hit a precise byte size, which is exactly what a KB target needs — and JPG is the format upload portals expect for photos and signatures. PNG is lossless and can't be tuned to an arbitrary size the same way.
Is my image uploaded anywhere?
No. The whole resize happens inside your browser using its built-in image encoder. Your photo or signature never leaves your device — which matters, since these are often identity documents.
Part of: Photo, signature & PDF for exam and job forms
Make your photo, signature and documents fit the form's exact limits.
- Check an exam photo and fix its background and framingFace size, white background, focus, light and colour against NEET, JEE, CUET or IBPS rules — fixed in one tap.
- Assemble a job or college application into one PDFCombine resume, certificates and ID in order, then check the size and searchable-text status against the portal's limit.
- Assemble visa, loan or KYC documents in the required orderOrder the documents the way the form expects, merge them, and compress to fit the cap in one step.