Resize Image to KB
Compress a photo or signature to an exact KB size.
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
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.
- 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.
- Shrink a PDF that a portal rejected as too largeReduce a document's size while checking it stays readable, rather than blurring it into uselessness.