Short answer: to resize a photo for an online form, set the exact pixel size the notification asks for (for example 200×230 px), then compress the JPEG until it sits inside the KB range (for example 20–50 KB). DPI only matters when a form gives the size in centimetres. A browser-based photo resizer such as ExamFitr does all three in one step, on your own device.
That is the whole trick, but the details are where uploads fail: a signature that ends up at 8 KB when the minimum is 10, a "3.5 × 4.5 cm" instruction with no pixel size, a portal that counts 20 KB as 20,000 bytes while your phone counts 20,480. This guide walks through every piece — pixels, KB, DPI, passport size photos, white backgrounds, signatures and the error messages portals show — so you can get a clean upload on the first attempt, from a phone or a PC.
What is the quickest way to get a photo to the right size?
Every upload rule boils down to three numbers: dimensions (width × height in pixels), file size (a KB range) and format (almost always JPG/JPEG). Get those three right and the upload goes through; miss one and the portal rejects the file, often without saying which one was wrong.
- Open the free resizer and choose your exam — the preset fills in the pixels, KB range and format from the source we cite, with the date we last checked it.
- Open your photo or signature. It is processed in your browser; nothing is sent to a server.
- Drag the crop box so your face is centred, and download when the badge turns green.
If your form isn't listed, paste the requirement text ("Photo 200 × 230 pixels, 20 KB to 50 KB, JPG") into the requirement box and the tool reads the numbers for you. The rest of this guide explains what is happening underneath, which is what you need when something goes wrong.
What is the difference between pixels, KB and DPI?
These three get mixed up constantly, and most "invalid photo" errors come from confusing them.
Pixels: the shape and detail
Pixels are the dots that make up the image. "200×230 px" means 200 dots across and 230 down. Portals check this exactly, or within a range, because the file is placed into a fixed box on your admit card. A modern phone photo is around 3000–4000 pixels wide, so it always needs cropping and scaling down. Resizing to fewer pixels is safe; stretching a small image up to more pixels only makes it blurry.
KB: the file weight
Kilobytes measure how much storage the file takes. Two images with the same pixel size can have very different KB values, because JPEG compression throws away more or less detail depending on the quality setting. That is why the same 350×450 px photo can be 25 KB or 180 KB. When a notification says "10–200 KB", it is limiting the file weight, not the shape.
One quirk matters here: some portals treat 1 KB as 1,000 bytes and others as 1,024. ExamFitr plays safe — a "maximum 50 KB" file is kept at or below 50,000 bytes and a "minimum 20 KB" file at or above 20,480 bytes, so it passes either way.
DPI: how big it prints
DPI (dots per inch) is a number stored in the file that tells a printer how many pixels to put in each inch of paper. It does not change the pixels or the KB. It matters when a form gives the size in centimetres, because you need it to work out the pixels:
pixels = centimetres ÷ 2.54 × DPI
| Physical size | At 200 DPI | At 300 DPI |
|---|---|---|
| 3.5 × 4.5 cm (passport size) | 276 × 354 px | 413 × 531 px |
| 2.5 × 3.5 cm | 197 × 276 px | 295 × 413 px |
| 3.5 × 1.5 cm (signature) | 276 × 118 px | 413 × 177 px |
| 6.0 × 2.0 cm (signature) | 472 × 157 px | 709 × 236 px |
So "what is a 3.5 x 4.5 cm photo in pixels?" has no single answer — it is 276×354 at 200 DPI and 413×531 at 300 DPI. Use the DPI the notification states. In the editor you can type the size in cm, mm or inches and the DPI, and the pixels are calculated for you; the same DPI is written into the JPEG so it prints at the right size.
What photo and signature size do SSC, IBPS, UPSC, NEET, JEE and PAN ask for?
These are the upload specs in our database, each taken from the source linked on its exam page. Notifications change from cycle to cycle, so verify with the official notification before you upload.
| Form | Photo | Signature | Source status |
|---|---|---|---|
| SSC CGL / CHSL 2026 | Captured live in the application (no upload) | ~6.0 × 2.0 cm → 472×157 px, 10–20 KB, JPEG | Official notice |
| IBPS PO / Clerk | 200×230 px, 20–50 KB | 140×60 px, 10–20 KB | Official guidelines |
| UPSC | 20–200 KB JPG (tool uses 550×550 px, inside the 550–1000 px range in UPSC’s FAQ); face ≈ 75% of the photo | Three signatures in one image, 350–500 px (tool: 400×500), 20–100 KB | Official instructions |
| NEET UG | 350×450 px, 10–200 KB | 350×150 px, 10–100 KB | Official bulletin |
| JEE Main | 350×450 px, 10–200 KB | 350×150 px, 10–100 KB | Official bulletin |
| PAN (Protean/NSDL) | 2.5 × 3.5 cm → 197×276 px, up to 20 KB | 4.5 × 2 cm → 354×157 px, up to 10 KB | Official |
| Passport Seva upload | 630×810 px, 10–250 KB | — | Secondary — verify |
A few things stand out. Banking exams (IBPS, for example) use the small 200×230 px / 20–50 KB photo and 140×60 px / 10–20 KB signature pair that many other portals copied. NTA exams (NEET, JEE Main, CUET) use 350×450 px with a generous 10–200 KB range. SSC moved to live photo capture for 2026, so for CGL and CHSL you only upload the signature. The full list of exam photo sizes covers 31 exams and portals, including state PSCs, railways, visas and ID documents.
How do I resize a photo for an online form, step by step?
- Read the three numbers. Find the pixel size, the KB range and the format in the notification — usually in a section called "Guidelines for scanning and upload of documents" or "Instructions for photo and signature".
- Pick the preset or type the numbers. In ExamFitr, search your exam; the requirement card shows the source, a confidence badge and the last-checked date. For anything else, paste the requirement text and click "Read & apply".
- Open your photo. Use a sharp, evenly lit, recent colour photo. HEIC photos from iPhones are converted automatically.
- Crop and fix the background. Keep your face centred with both ears visible if the form asks for it. If the background must be white, click Remove background and choose white.
- Check the badge and download. The badge turns green when the pixels, KB range and format all match. Download the JPG and upload that exact file.
Don't open the downloaded file in another editor and save it again; many apps re-compress on save and can push the file outside the range you just hit.
How do I compress an image to 20 KB, 50 KB or 100 KB?
Compression works by lowering JPEG quality. A good compressor searches for the highest quality that still fits, rather than blasting the photo down to a blurry mess. Pixel size matters just as much: fewer pixels need fewer bytes.
Compress image to 20 KB
20 KB is comfortable for a signature and tight for a photo. For a photo, use the smallest pixel size the form allows (for example 200×230 px) and crop out empty background. Plain, light backgrounds compress far better than busy ones. Try the compress to 20 KB page, which keeps your crop size and only shrinks the pixels if quality alone can't get there.
Compress image to 50 KB
50 KB is the most common upper limit for exam photos. At 200×230 px or 350×450 px a photo usually fits at high quality. The 50 KB page is set up for it; if your form also fixes pixels, pick the exam preset instead so both rules are applied.
Compress image to 100 KB
100 KB leaves room for detail, which is why forms that want scanned documents or larger photos use it. Phone photos straight from the camera are usually 2–5 MB, so they need scaling down first. Use compress to 100 KB, or, for multi-page scans, combine the images into one PDF with a size cap.
What if the file is too small?
Minimums exist too (10 KB, 20 KB). Raising the quality fixes most cases; ExamFitr can also pad the JPEG with harmless metadata up to the minimum, so the image is not upscaled. If you need an exact figure, "Make it exactly N KB" produces a file of precisely N × 1024 bytes.
How do I resize a signature to 10–20 KB?
Signatures fail for different reasons than photos: grey paper, faint ink, shadows from your phone, or so much white space that the ink becomes a thin line once it is scaled down.
- Sign on plain white paper with a black or blue pen, slightly larger than you normally would.
- Photograph it flat, in daylight, from directly above, so there is no shadow of your hand or phone.
- Switch the editor to Signature mode: it trims the white space, whitens the paper and darkens the ink. That also keeps the file small.
- Set the form's pixel size — 140×60 px for IBPS, 472×157 px for SSC, 350×150 px for NEET and JEE Main — and the KB range.
Some forms have extra rules: IBPS does not accept signatures in capital letters, and UPSC wants your signature written three times, one below the other, in a single image. Read the notes on the UPSC and IBPS pages before you sign.
How do I make a passport size photo online for free?
"Passport size" in India means 35×45 mm (3.5 × 4.5 cm) with a plain white background and the face filling most of the frame. There are two different things people need:
- A digital file for upload. The Passport Seva upload spec we cite is 630×810 px, 10–250 KB — from a secondary source, so confirm on the portal. Choose the Passport Seva preset.
- Printed copies. Open the Passport & print sheet section in the editor, choose the size (India 35×45 mm, US 2×2 in, UK, Schengen, Canada and more), the paper (A4, 4×6 in, 5×7 in or Letter) and the number of copies. It lays them out at 300 DPI with cut marks, as a JPG or PDF you can print at any photo shop — print at 100% scale, not "fit to page".
For the photo itself: stand about an arm's length from a plain wall, face a window rather than a lamp, keep your expression neutral and take off tinted glasses. Visa photos have their own rules — the US visa, for example, wants a square image between 600×600 and 1200×1200 pixels, 240 kB or less.
How do I make the photo background white?
Many forms ask for a white or light background. You don't need a studio: click Remove background, then pick white, off-white, light blue or any colour.
ExamFitr's default "Best" option runs a portrait-matting model in your browser. It refines the edges around hair and removes the colour fringe the old background leaves on your outline, so the result looks clean on white instead of cut out. "Light" is faster and keeps very curly or voluminous hair fuller, with softer edges; if the first result trims your hair, try it. The model is downloaded once from this website and cached, and your photo never leaves the device.
Always look at the result at full size before downloading. Background removal can't fix a blurry photo or harsh shadows on your face, and some notifications forbid digitally altered photos beyond cropping and resizing — check yours.
How do I change the DPI of an image or convert it to JPG?
Some portals ask for "minimum 200 DPI" or reject PNG and HEIC files. The image converter and DPI changer converts PNG, WEBP, HEIC and TIFF to JPG (or PNG/WEBP) in a batch and writes the DPI you choose into each file. Changing DPI this way does not resample or blur the image; it only updates the value stored in the header. If you also need a size in centimetres, set the pixels from the formula above so the physical size and the DPI agree.
Why does the form reject my photo? Common errors and how to fix them
"File size too large" or "exceeds maximum size"
The file is above the KB limit. Set the maximum in the resizer and download again. If you did and it still fails, the portal probably counts 1 KB as 1,000 bytes — ExamFitr already keeps maximums at N × 1000 bytes to cover this.
"File size too small" or "minimum 10 KB"
Increase quality, use the exact pixel size instead of a smaller one, or set the minimum KB so the file is padded up to it.
"Invalid dimensions" or "image must be 200 × 230 pixels"
The pixel size doesn't match. Type the exact width and height, keep the crop locked to that ratio and download again. Don't rely on your phone's "small/medium/large" share options — they don't produce exact sizes.
"Photo not clear", or rejected at verification
This is about the photo, not the file: blur, shadows, face too small, eyes hidden, dark glasses or a busy background. Retake it in daylight facing a window, fill most of the frame with your face (UPSC asks for about three quarters) and remove the background if needed.
Blurred or faint signature
Usually the signature was photographed small and then scaled up, or the ink is too light. Sign larger, use a darker pen, crop close to the ink and use Signature mode's "darken ink" and "boost contrast" options.
"Invalid file type" or "only JPG allowed"
Convert to JPG first. Renaming a .png to .jpg does not convert it, and some portals check the real format.
How do I resize a photo on my phone?
You don't need an app. Open ExamFitr in Chrome or Safari, tap to choose a photo (or take one), pick the preset and download — the file goes to your Downloads or Files app, ready to attach in the form. It works the same on Android and iPhone, and iPhone HEIC photos are converted automatically.
A few phone-specific tips: turn off beauty filters and portrait mode before taking the photo, clean the lens, and don't use a screenshot of your photo — screenshots change the pixel size and add the status bar. If the portal only works on desktop, send the downloaded file to your computer rather than re-saving it through a messaging app, which recompresses images.
Is it safe to resize photos online?
It depends on where the processing happens. Many online photo resizers upload your image to their server, resize it there and send it back. For an exam photo and signature — which together identify you — that is a real risk.
ExamFitr works differently: resizing, compression, background removal, PDF creation and conversion all run inside your browser. The code and model files are downloaded from this site; your photo is never uploaded, and the editor's security policy blocks it from connecting to any other server. You can check this yourself in your browser's developer tools — no request carries your image. See the privacy policy for the details.
Frequently asked questions
How do I resize an image in KB?
Set the maximum (and minimum, if the form gives one) file size and let the tool lower the JPEG quality step by step until the file fits. In ExamFitr, type the KB range or pick a preset, open your photo and download when the badge turns green. Pixel size decides the shape; KB decides the file weight, so fix the pixels first.
How do I compress an image to 20 KB?
Crop tightly, set the exact pixel size the form asks for, then set 20 KB as the maximum. 20 KB is easy for a signature (IBPS: 140×60 px, 10–20 KB) but tight for a photo, so a photo usually needs a smaller pixel size. Portals count KB differently, so ExamFitr keeps files at or below 20,000 bytes.
How do I reduce photo size to 100 KB on my phone?
Open a browser-based photo resizer on the phone, choose your photo from the gallery, set the maximum to 100 KB and download. No app is needed: ExamFitr runs inside mobile Chrome or Safari and never uploads the picture. Phone photos are often 3–5 MB, so the tool also scales the pixels down if quality alone can't reach 100 KB.
How do I increase photo size in KB?
If a portal says the file is too small (for example below 10 KB or 20 KB), raise the JPEG quality or use the exact pixel size requested instead of a smaller one. ExamFitr also pads a JPEG with harmless metadata up to the minimum when the minimum KB is set, so the picture itself is not changed or stretched.
What is 3.5 × 4.5 cm in pixels?
Multiply the size in inches by the DPI. 3.5 cm is 1.378 in and 4.5 cm is 1.772 in, so at 200 DPI the photo is 276×354 px and at 300 DPI it is 413×531 px. If a form gives only centimetres, use the DPI it states; if it doesn't state one, 200 DPI is a common choice for uploads.
How do I make a passport size photo on my mobile for free?
Take a photo facing a plain wall in daylight, open it in ExamFitr, choose the India passport 35×45 mm size, remove the background to white and download. For prints, the Passport & print sheet section lays out copies on A4, 4×6 in or 5×7 in paper at 300 DPI with cut marks. It is free and works in a phone browser.
How do I remove the background of a photo for free?
Use an on-device background remover: ExamFitr runs an AI matting model inside your browser, so the photo never leaves your phone or PC. Click Remove background, pick white (or light blue if your form asks for it) and check the hair edges. A plain, evenly lit wall behind you still gives the cleanest result.
How do I change the DPI of an image?
DPI is a label stored in the file that tells printers how big to print it; it doesn't change the pixels. Open the image in ExamFitr's converter, type the DPI (for example 200 or 300) and download — the value is written into the JPEG or PNG header. If a form asks for size in cm, set pixels from cm × DPI too.
Can I upload a photo with glasses (specs) for UPSC?
UPSC's upload instructions reject photos where the eyes are hidden by coloured or dark glasses and ask you to avoid glare on eyeglasses; plain clear glasses are not listed as banned. Other forms differ — SSC's live photo is captured without spectacles — so follow the notification for your exam.
Ready to resize?
Pick your exam, open your photo and download a file that matches the pixels, KB range and format — free, in your browser, with nothing uploaded. Open the photo and signature resizer →