Reduce Image Size in KB
Compress a photo to exactly the size you need: 20KB, 50KB, 100KB, 1MB or any other limit. Set the pixel dimensions an application form asks for, and get the best quality that fits. Nothing is uploaded.
More options: exact pixels and format
For forms that require, for example, 200 × 230 px. The photo is cropped to fit around its center. Leave empty to keep the original shape.
JPG is accepted everywhere. WebP looks better at the same size but some forms don’t accept it.
How to compress an image to a specific size in KB
- Type the size you need, for example 50 KB, or pick a common size.
- Drop your photo onto the box, or click to choose it from your phone or computer. HEIC photos from iPhones work too.
- If the form asks for exact pixels (such as 200 × 230 px), open More options and enter them.
- Press Download. Several photos? Use Download all to get a ZIP.
How the compression works
The tool first tries the highest JPG quality. If the file is too big, it finds the highest quality that fits your limit; only if that isn’t enough does it reduce the width and height, a little at a time. You get the largest, sharpest image that is still under the limit, never a file that a form would reject for being one byte too big.
Tips for application forms
- Read the form’s rules: most give a range such as 20–50 KB and sometimes exact pixel dimensions.
- Choose a size a little under the maximum, for example 45 KB for a 50 KB limit.
- Use a plain, light background and good light: plain backgrounds compress far better than busy ones.
- Crop signatures closely and scan them on white paper so they stay crisp at 10–20 KB.
- Save as JPG unless the form says otherwise; it is accepted everywhere.
Image size guide
Typical uses and recommended dimensions for each file size. Click a size to open its page.
| File size | Good for | Recommended dimensions |
|---|---|---|
| 10KB | Signatures for online application and exam forms | about 200 × 200 px for a photo, or 140 × 60 px for a signature |
| 20KB | Signature uploads for exam and job applications | about 300 × 400 px for a photo, or 300 × 100 px for a signature |
| 30KB | Photos and signatures for government and exam forms | about 400 × 500 px for a photo |
| 50KB | Passport-size photos for online applications, exam forms and visa portals | about 600 × 800 px |
| 100KB | Online forms and portals with a 100KB limit | about 1000–1200 px on the longest side |
| 200KB | Website and blog images that load fast | about 1600 px on the longest side |
| 500KB | High-quality photos for upload forms with a 500KB limit | about 2500 px on the longest side |
| 1MB | Forms and portals with a 1MB upload limit | full phone resolution in most cases (about 3000–4000 px) |
Compress to another size
Frequently asked questions
How do I reduce the size of an image in KB?
Type the size you need (for example 50 KB) in the box, then drop your photo. The tool finds the highest quality that fits under that size and only shrinks the dimensions if it has to. Download the JPG, or several at once as a ZIP.
What size should a photo be for an online form?
Check the form’s instructions: most give a range in KB and sometimes exact pixels. Common limits are 10–20KB for signatures, 20–50KB for passport-size photos and 100–200KB for documents. Choose a value a little under the maximum.
Can I set the exact pixel size too?
Yes. Enter a width and height under “Exact size in pixels”. The photo is cropped to that shape around its center and then compressed to your KB limit, so it meets both rules of the form.
Why can’t the file be exactly 50KB?
Image formats don’t let you choose an exact byte count, and forms reject files that are even slightly too big. The tool therefore gives the highest quality that stays at or under your limit, usually within a few percent of it.
Can I compress PNG, HEIC or WebP images too?
Yes. You can drop JPG, PNG, WebP, AVIF and iPhone HEIC photos. They are saved as JPG, which every form accepts, or as WebP if you choose it. Transparent areas in PNGs are filled with white.
Are my photos uploaded?
No. Everything happens in your browser on your own device, so photos of your face, ID or documents are never sent to a server. It even works offline once the page has loaded.