How to Reduce a Photo to an Exact KB Size — Free Online

PhotoFit Guide · August 2026 · 6 min read

You have a photo. The JEE portal says the file must be between 10 KB and 40 KB. Your phone camera produced a 3.8 MB JPEG. How do you compress it to exactly 30 KB without ruining the quality? This guide explains how to reduce any photo to an exact KB size online for free, using only your browser.

Why "reduce quality" in Photoshop is not enough

Most image editors let you set a quality percentage — 80%, 60%, 40% — but they do not tell you the resulting file size in KB. You end up guessing and re-exporting multiple times. PhotoFit solves this with a binary search algorithm: it tries up to 22 different quality levels automatically to converge on a file size that hits your exact KB target.

Step-by-step: Reduce photo to exact KB using PhotoFit

Go to photofitapp.in

Open PhotoFit in any browser. No account, no download, no app to install.

Type your target KB

In the KB field on the homepage, type the maximum KB you need — for example, 40 for a 40 KB limit. PhotoFit will compress to be within that limit.

Upload your photo

Click Upload or drag and drop. JPG, PNG, and WebP are all supported. Your file stays in your browser.

Wait for the result (under 1 second)

PhotoFit runs up to 22 binary-search iterations to converge on your exact KB target. The result appears instantly.

Check the output quality

The preview shows you the compressed photo. If the quality looks acceptable, proceed. If not, try a slightly higher KB target — for example, 45 instead of 40.

Download your photo

Click Download. The file is saved to your device, ready for any exam portal, passport application, or job form.

⚡ Compress my photo now →

Photo KB limits for Indian exams and passports

Exam / Portal	Photo KB range	Signature KB	Notes
JEE Main	10–40 KB	4–30 KB	Rejected if over 40 KB
NEET UG	10–200 KB	4–30 KB	NTA 2026 spec
UPSC CSE	20–300 KB	20–300 KB	Generous range
SSC CGL	20–50 KB	10–20 KB	Strict 50 KB cap
IBPS PO	20–50 KB	10–20 KB	Strict 50 KB cap
RRB Group D	20–40 KB	10–20 KB	Very strict
Indian Passport (Seva)	10–50 KB	—	Plain white bg required
US Visa (DS-160)	Under 240 KB	—	Max 240 KB, JPEG only

Common mistakes when compressing exam photos

Compressing a PNG to KB — PNG is a lossless format and cannot be compressed the same way JPEG can. Always use JPEG output for government portal submissions.
Using WhatsApp-compressed photos as the original source. WhatsApp already degrades quality. Always use the original camera photo.
Not checking the KB minimum. Many portals have both a maximum AND a minimum KB. A 5 KB file is too small for a portal that requires 10–40 KB.
Confusing KB and MB. 1 MB = 1024 KB. A 3.8 MB camera photo = 3891 KB. You need to compress it by roughly 98% to reach 40 KB.
Compressing the signature photo with the same settings as the face photo. Signature photos usually have tighter KB limits.

Try PhotoFit — exact KB compression, free

Type your KB target. Upload. Download. No guessing, no multiple exports, no upload to any server.

Open PhotoFit →Compress guide