Resize Image to 45 KB
Aiming for 45 KB instead of 50 KB leaves margin. Some websites count a kilobyte as 1000 bytes, not 1024, so a file that looks like 49 KB on your computer can be rejected. Everything runs in your browser — nothing is uploaded. Need different dimensions instead? Resize or convert.
Why compress to 45 KB?
Many sites cap images at 45 KB — typically for passport-style photos on exam, job and visa application portals. That leaves room for roughly a 520×390 JPG photo.
About 520×390 px fits
At medium quality a detailed JPG photo of roughly 520×390 pixels lands under 45 KB; at high quality about 360×270.
Typical use
45 KB limits are common for passport-style photos on exam, job and visa application portals.
80× smaller than a phone photo
A 12 MP phone photo is around 3–4 MB, so it must shrink about 80×. The tool lowers quality first and resizes only if needed.
Quality to expect
At 45 KB, quality is fine for small display. Good for thumbnails, profile photos and forms.
Scans and documents
A scanned A4 page of about 630×900 pixels usually fits, because text pages compress far better than photos.
Exact limit, checked
45 KB is measured as 46,080 bytes (1 KB = 1,024 bytes), the way most upload forms count it, so the file is never just over.
45 KB at a glance
| Limit in bytes | 46,080 bytes |
|---|---|
| Photo at high quality | about 360×270 px |
| Photo at medium quality | about 520×390 px |
| Photo at low quality | about 710×530 px |
| Scanned A4 document | about 630×900 px |
| Reduction from a 12 MP phone photo | about 80× |
| Output format | JPG (best for photos), WebP or PNG |
| Typical use | Passport-style photos on exam, job and visa application portals |
Compress an image to 45 KB in 3 steps
- Add your image — JPG, PNG, WebP or a phone photo.
- The target is already set to 45 KB. Leave “Remove EXIF metadata” ticked to save extra bytes.
- Click Compress and download a JPG under 45 KB.
New to image compression? Read the full compression guide.
Why aim a little under the limit
Two kinds of kilobyte. Windows reports 1 KB as 1024 bytes. Some web forms count 1000. A 49 KB file (50,176 bytes) is over a "50 KB" limit that means 50,000 bytes. At 45 KB (46,080 bytes) you pass either way.
Forms also re-save files. Some portals convert or rename uploads, and a few bytes can change. A 10% margin avoids surprise rejections.
What fits: a clear face photo around 450–500 pixels wide.
The exact limit: 50 KB. Other margins: 95 KB (under 100 KB). JPG only: JPEG under 45 KB.
Other file-size targets
Nearby limits — each one opens the compressor already set to it:
Compress by format
Guides and presets for each format:
Compress under a file size
Keeps your image’s format — pick the limit you need:
JPEG under a file size
Frequently asked questions
My 49 KB photo was rejected by a 50 KB limit. Why?
The site probably counts 1 KB as 1000 bytes, so 49 KB on your computer (50,176 bytes) is over 50,000. Compress to 45 KB for a safe margin.
How many pixels fit in 45 KB?
For a detailed JPG photo, about 520×390 at medium quality or 710×530 at low quality. Simple graphics and scans can be much larger.
What quality will a 45 KB photo have?
Fine for small display. Good for thumbnails, profile photos and forms. The tool keeps the dimensions where it can and lowers compression quality first, so faces and text stay readable.
Is 45 KB the same as 45,000 bytes?
Not quite. Most forms count 1 KB as 1,024 bytes, so 45 KB is 46,080 bytes. The tool uses the same count, so a file it marks as under 45 KB is accepted.
Should I use JPG or WebP for 45 KB?
JPG is accepted everywhere and is the safe choice for forms. WebP holds about 30% more detail at the same size, ideal for websites that support it.
Why is my file still over 45 KB?
Very large or detailed images may not reach 45 KB by quality alone. Resize it first (for example to 520 pixels wide) with the resizer, then compress again.
Are my images uploaded anywhere?
No. They are read and compressed by your own browser and never leave your device. You can disconnect from the internet once the page has loaded and it will still work.