My form has a minimum size, for example 20 KB to 50 KB. How do I stay above it?

Set the limit to the maximum, here 50 KB. FitKB picks the highest quality that fits, so the file normally lands just under the maximum and well above the minimum.

Can I use the same photo for several applications?

Yes, as long as it is recent enough for each form. Keep the original and create a separate copy for each set of size rules.

Photo ID

Photo and Signature Size for Exam and Job Application Forms

By FitKB · Updated November 11, 2026 · 2 min read

Quick answer

Read the official notification for the exact rules, then prepare two files: a recent photo with a plain light background, and a signature on white paper. Typical limits are about 20 to 50 KB for the photo and 10 to 30 KB for the signature, both in JPG, but each form sets its own.

Open the Compress Image to 20KB tool

Start with the official instructions

Every exam board, university and employer sets its own rules, and they change between years. Find the section of the official notification or help page that lists photo and signature requirements, and write down four things for each file: format, minimum and maximum file size, pixel dimensions, and background colour.

The ranges below are typical examples, not rules for any particular form. Where they differ from your form's instructions, follow the form.

Typical requirements

Typical photo and signature requirements on application portals
File	Typical file size	Typical shape	Format
Photograph	20 KB to 50 KB	Portrait, taller than wide	JPG
Signature	10 KB to 30 KB	Landscape, wider than tall	JPG
Thumb impression	10 KB to 50 KB	Square or landscape	JPG
Supporting document	100 KB to 1 MB	Any	JPG or PDF

Preparing the photo

Use a recent photo with your face clearly visible, a neutral expression, and a plain white or light background.
Avoid caps and dark glasses unless the instructions allow them for religious or medical reasons.
Open the 20 KB or 50 KB preset, or type the exact limit on the home page.
If dimensions are given, choose Exact width × height, crop to fill, and enter them.
Download, and check the file name ends in .jpg.

Preparing the signature

Sign on white paper with a dark pen, photograph it from above in good light, and use the signature preset. Change the width, height and limit to match your form. Detailed tips are in how to resize your signature.

Before you submit

Check that each file is between the minimum and the maximum size, counting exact bytes.
Make sure the photo and signature are not swapped in the upload fields.
Look at the preview the portal shows after upload, if it has one.
Keep the originals and the final files together so you can reuse them for later stages.

Mistakes that get applications flagged

Using an old photo that no longer looks like you, or one with a filter or beauty effect applied.
Uploading a selfie with the face at an angle or partly in shadow.
Signing in capital letters on one form and in cursive on another; use the same signature you will use on exam day.
Uploading the photo in the signature field or the other way round.
Taking a screenshot of the photo, which adds phone status bars and changes the format.
Leaving it until the last day, when portals are slow and there is no time to fix a rejected upload.

Some exams compare your uploaded photo with your appearance on the day. Use a clear, recent, natural photo and keep a few prints of the same photo in case they are needed later.

Questions people also ask

My form has a minimum size, for example 20 KB to 50 KB. How do I stay above it?: Set the limit to the maximum, here 50 KB. FitKB picks the highest quality that fits, so the file normally lands just under the maximum and well above the minimum.
Can I use the same photo for several applications?: Yes, as long as it is recent enough for each form. Keep the original and create a separate copy for each set of size rules.