Compress Image to KB (Photo Size Reducer)
Compress image to KB for exam, job and government forms: type the limit from the form, such as 20, 50, 100 or 200 KB, and get a JPG that is guaranteed to be under it. Add exact pixel dimensions when the form asks for them too. The photo is processed in your browser, so ID photos and signatures are never uploaded.
- Runs on your device
- WASM codecs
- Canvas · GPU
- Works offline
Updated
Drop your images here
How to compress an image to a specific KB size
Step 1: Add your photo or scanned signature to the box above.
Step 2: Type the limit from the form under Target size, for example 50.
Step 3: If the form also gives pixel dimensions, set Pixel size to Exact width × height and enter them.
Step 4: Press Compress and upload the downloaded JPG to your form.
Good to know
Settings explained
- Target size
- Finds the highest quality that fits. Photos with too much detail for the limit are scaled down just enough to stay sharp.
- Output format
- WebP and AVIF are typically 25–50% smaller than JPG at the same quality.
- Pixel size
- Some forms also ask for exact pixels.
- Keep metadata (EXIF)
- Off removes camera details, dates and GPS location — safer when sharing. On keeps them.
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- WebAssembly codecs
- Images are encoded with Squoosh-grade codecs (MozJPEG, WebP, AVIF, OxiPNG, JPEG XL). Each codec loads only when you use it.
- GPU canvas
- Pixels are drawn and composited with the GPU-accelerated canvas.
What a photo looks like at each KB limit
The tool keeps as many pixels as it can and lowers quality first; only when a limit is very tight does it shrink the photo as well. Here is what happened to a 24-megapixel photo (6000 × 4000, 881 KB) at the four most common limits, with this tool’s default settings.
| Target | Result size | Pixels kept | JPG quality used |
|---|---|---|---|
| 20 KB | 19.2 KB | 658 × 439 | 46% |
| 50 KB | 47.8 KB | 1041 × 694 | 60% |
| 100 KB | 92.3 KB | 1472 × 981 | 69% |
| 200 KB | 186 KB | 2081 × 1388 | 78% |
What photo size in KB do exam and job forms need?
It varies by form, so always follow the official notice. A common pattern is 20–50 KB for a photograph and 10–20 KB for a signature, often together with a fixed pixel size and JPG format. Larger limits such as 100 or 200 KB appear on university, visa and job portals.
The tool treats your number as a ceiling and aims about 2% below it, so the file passes whether the website counts 1 KB as 1,000 or 1,024 bytes. If a form also sets a minimum, such as “between 10 and 20 KB” for signatures, the signature resizer handles that range.
KB vs pixels: what the form really checks
Forms check up to three things, and they are independent. File size in KB is how much space the file takes; that is what this tool controls. Dimensions in pixels (for example 200 × 230) are the width and height of the picture. Format is usually JPG or JPEG. A photo can be the right pixel size but too many KB, or the right KB but the wrong shape.
That is why “resize image in KB” is a slightly misleading phrase: to reduce image size in KB you mostly change compression, not pixels. This tool does both, and changes pixels only when you ask for exact dimensions or when the limit leaves no other way.
| Form says | What it means | Setting here |
|---|---|---|
| “Max 50 KB” or “below 50 KB” | File size ceiling | Target size 50 |
| “200 × 230 pixels” | Exact width and height | Pixel size → Exact width × height |
| “JPG/JPEG only” | File format | Output format JPG (default) |
| “3.5 × 4.5 cm passport photo” | Print size and framing | Passport photo maker |
| “Between 10 and 20 KB” | Size window | Signature resizer |
How to compress an image to a specific KB and pixel size
Set both. Type the KB limit under Target size, then choose Exact width × height under Pixel size and enter the numbers from the form. When you give both width and height, the photo is cropped from the centre to that shape and resized, so it is never stretched. Enter only one side to keep the original proportions.
If your face or signature is not centred, crop it first with crop image at the right ratio, then compress here. Small pixel sizes such as 200 × 230 fit easily into 20 KB at high quality: a test photo came out at 14.9 KB with 89% quality.
Can I reduce KB without losing quality?
Usually yes, if the limit is reasonable for the pixel size. The tool searches for the highest JPG quality that still fits, up to 92%, so a modest reduction is invisible. When the limit is tight, something has to give. Instead of producing a blocky photo at very low quality, the tool lowers the resolution just enough to fit at a moderate quality, which looks cleaner on screen and in print at form sizes.
If your photo is already a JPG under the limit, it is never made bigger: when a fresh copy at 92% would not be smaller, the original image data is kept, minus its metadata.
Reduce photo size in KB on a phone or laptop
The page works in any current browser, which is handy when you are filling the form on the same device.
Android phone
Open this page in Chrome, tap the box and pick the photo from your gallery or camera. The compressed JPG is saved to Downloads, ready to attach in the form.
iPhone
In Safari, tap the box and choose the photo. HEIC photos are converted to JPG automatically. Save the result to Files so the form’s upload button can find it.
Windows laptop or PC
Drag the scan or photo from File Explorer onto the box, press Compress and use the downloaded file from your Downloads folder.
Mac
Drag the file from Finder or Photos onto the box. The JPG appears in Downloads after you press Compress.
Why use this KB converter
- Private. ID photos and signatures stay on your device; no server ever receives them.
- Always under the limit. The number is a hard ceiling with a small safety margin for both KB definitions.
- Quality first, pixels second. It shrinks dimensions only when quality alone cannot reach the target.
- Free and unlimited. No sign-up, no watermark, and as many photos as you need.
Tips & troubleshooting
Scanning a signature? Use dark ink on white paper and good light; clean contrast compresses far better than a grey, shadowed scan.
The form wants MB rather than KB? 1 MB is 1,000 KB (or 1,024), so “max 1 MB” means typing 1000 here is safe.
Got a PNG or HEIC from your phone? Leave the output on JPG; most forms only accept JPG.
For everyday compression without a fixed number, the image compressor offers a quality slider and WebP or AVIF output.
Compress Image to KB FAQ
How do I reduce a photo’s size in KB?
Add the photo, type the KB limit under Target size and press Compress. The tool finds the highest quality that fits under the number and, only if needed, lowers the resolution. The result is a JPG you can upload directly.
How do I compress an image to a specific KB and pixel size?
Type the KB limit, then set Pixel size to Exact width × height and enter the dimensions. Both sides set means a centre crop to that shape; one side keeps the proportions.
What photo size in KB do exam and job forms need?
It depends on the form. Photos are often 20–50 KB and signatures 10–20 KB, sometimes with fixed pixel dimensions. Always check the official notice for your application.
Can I reduce KB without losing quality?
For reasonable limits, yes: the highest quality that fits is used, up to 92%. Very small limits need fewer pixels too, which the tool handles by resizing slightly instead of making the photo blocky.
Will the file be exactly the KB I type?
It will be just under it, typically within a few percent. Forms accept anything below their limit, and the small margin covers both ways websites count kilobytes.
How do I reduce photo size in KB on my phone?
Open this page in Chrome or Safari on the phone, pick the photo, type the limit and press Compress. The JPG is saved to your downloads; no app needed.
Is it safe to compress my ID photo here?
Yes. The photo is processed in your browser and never uploaded, which matters for identity documents and signatures.