CAT Photo & Signature Size
CAT has a minimum file size as well as a maximum. Here is what to aim for so a too-small file does not get refused.
PhotoResizer's CAT (IIM) preset uses a photo of 30–1000 KB at 350 × 450 px and a signature of 30–80 KB at 350 × 150 px, both JPEG. Always compare with the official notification before you upload.
Most people searching for photo sizes are trying to make files smaller. CAT is a good example of the opposite problem. The signature range starts at 30 KB, so an over-compressed file can fail just as a large one can.
Below are the CAT (IIM) preset values and a short routine for hitting both ends of the range.
Sizes in the PhotoResizer CAT (IIM) preset
| Requirement | Photograph | Signature |
|---|---|---|
| Format | JPEG | JPEG |
| File size | 30 KB – 1000 KB | 30 KB – 80 KB |
| Dimensions | 350 × 450 px | 350 × 150 px |
Do not over-compress
If you have already shrunk a signature to 10 KB for another form, do not reuse it here. Start again from the original scan or photo and set the target between the minimum and maximum. Re-enlarging a tiny file does not restore detail, it only makes the edges soft.
How to resize your photo and signature
- Keep your originals — Use the unedited photo and the scan or picture of your signature, not copies that have already been compressed.
- Open PhotoResizer — Choose the CAT (IIM) preset from the exam list, or enter custom values if your notification differs.
- Upload and check the preview — Add the photo, then the signature, one at a time. Look at the preview before you accept it.
- Download and check the size — Save the JPEG files and confirm the KB size in your file manager before uploading to the form.
Practical tips
- Keep the original photo and signature scans. You will want the full-quality version for each new form.
- Aim for the middle of the range rather than the very edge, so a small difference in how the portal measures the file does not tip it over.
- Check the preview. If the signature looks blurry at 100 percent, rescan it at higher quality.
Frequently asked questions
What is the CAT photo size?
The preset uses 350 × 450 px and 30 KB to 1000 KB in JPEG. Confirm on the official CAT registration page for the current year.
What is the CAT signature size?
The preset uses 350 × 150 px and 30 KB to 80 KB in JPEG. Check the registration instructions.
Why was my file rejected for being too small?
Some forms set a minimum size. If the file is under the minimum, resize again from the original with a higher quality target.
Are my images stored anywhere?
No. The resizing runs in your browser and the files are not uploaded.
Related guides
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