Pick the limit your form asks for. Each page opens the Image Resizer with the size already set, and your picture stays on your device.
Resize to 10 KB
Very small limits like this are usually set for signatures and thumbnails on registration forms.
Resize to 15 KB
Used for small signature and thumbprint fields on some forms.
Resize to 20 KB
A common limit for signatures and small passport-style photos on application portals.
Resize to 30 KB
Used for passport photographs and ID pictures on many online forms.
Resize to 50 KB
A very common limit for passport photographs, signatures and ID scans.
Resize to 100 KB
Often required for photographs and scanned documents on admission and recruitment portals.
Resize to 200 KB
Used for scanned certificates, result slips and ID cards on many portals.
How file size and picture size are linked
A JPG file gets smaller when you reduce the number of pixels, the quality, or both. Starting points for a typical photo:
| File size | Picture size to start with |
|---|---|
| 10 KB | about 150 to 200 pixels wide |
| 15 KB | about 200 pixels wide |
| 20 KB | about 200 to 300 pixels wide |
| 30 KB | about 300 to 400 pixels wide |
| 50 KB | about 400 to 600 pixels wide |
| 100 KB | about 600 to 800 pixels wide |
| 200 KB | about 900 to 1200 pixels wide |
These are starting points, not rules. Photos with detail need more bytes than a plain signature. Read the guide to reducing PDF and image size for more.
Frequently asked questions
How do I reduce a photo to under 100 KB?
Open the Image Resizer, type 100 in “Largest file size” and add your photo. The tool lowers the quality in small steps until it fits, and shrinks the picture a little if needed.
Why is my phone photo so large?
Phone cameras save pictures at 3000 pixels wide or more, which is several megabytes. For a form you only need a few hundred pixels, so resizing makes the file far smaller.
Free tools you may need
Image Resizer
Resize and compress photos to exact pixels, cm or a target size in KB. Passport and portal presets.
JPG to PDF
Combine multiple JPG or PNG images into a single PDF document.
Compress PDF
Reduce the size of your PDF files while keeping them readable.
Scan to PDF
Scan paper with your camera or photos. Make a PDF, searchable PDF, Word file, text or JPG.