Compress JPEG to 45 KB
Aiming for 45 KB keeps a photo safely under a 50 KB limit even when a website counts kilobytes as 1000 bytes instead of 1024. 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 |
| 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.
The 45 KB safety margin
A file this tool calls 49.5 KB is 50,688 bytes — over a 50,000-byte limit. Portals don't always say which way they count, so targeting 45 KB passes either way.
The quality cost is tiny. 45 KB vs 50 KB is a 10% difference that you won't see in a form photo.
Pixel guide: about 500 pixels wide for a portrait.
Rejected anyway? Check the format too — the portal may want JPG only, which this page always produces.
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
Why was my 49 KB file rejected by a 50 KB limit?
The site counts 1 KB as 1000 bytes, so your file is over 50,000 bytes. A 45 KB target avoids that.
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.