How to Scan an ID, Passport, or Certificate for an Online Application

Application portals reject scans for a handful of predictable reasons — glare, crop, size, both sides. Here is how to produce one that passes the first time.

Visa applications, university admissions, bank KYC, job onboarding — they all want a scan of something small and official, and they all reject the first attempt. The reasons are consistent enough to plan around.

Why scans get rejected

  • Glare. A flash or an overhead light bounces off a laminated card and whites out exactly the part they need to read.
  • Cropped edges. A corner cut off makes the document look tampered with, and most reviewers reject on sight.
  • Background in frame. A card photographed on a patterned tablecloth with your thumb in the corner doesn’t read as a document.
  • Too big. The portal caps uploads and won’t tell you clearly.
  • Wrong count. They asked for both sides; you sent one.
  • Angle. A card shot from 30° off is a trapezoid, and half of it is out of focus.

Doing it properly with a phone

Scan to PDF is built for this and runs in the browser — no app to install. On a computer the page shows a QR code; scan it with your phone to continue there, since a laptop can’t photograph a card well.

1. Set up the shot. Put the document on a plain, contrasting surface — a dark card on white paper, a white certificate on a dark desk. Flat, no curling.

2. Use indirect daylight. Near a window, not under a ceiling light directly overhead, and never with the flash on. If your own shadow falls across the page, turn 90°.

3. Shoot straight down. Hold the phone parallel to the document, not tilted. Fill the frame but leave a small margin so no edge is clipped.

4. Capture both sides. Photograph the front, then the back, as two captures in the same session. They become pages 1 and 2 of one PDF — which is what “upload a scan of your ID” almost always means.

5. Crop each page. Each captured photo has a Crop button; drag the rectangle down to the document edges so the desk and your fingers aren’t part of the file.

6. Pick a mode. Colour is the right choice for photo IDs, passports, and anything with a seal, hologram, or signature in colour — reviewers often need to see them. Black & White gives a crisp, classic scan for plain printed certificates and transcripts, and produces a much smaller file. Grayscale sits in between.

7. Tick Compress if the portal has a tight size limit.

Getting it under the size limit

If the upload still bounces, compress the PDF — and check the result is legible at 100% zoom before uploading. For very low limits like 100 KB, rescan in Black & White and make sure you cropped tightly; background pixels cost real space. Whatever you do, don’t crop into the document itself to save size.

Protecting a scan of your ID

You’re about to email a copy of your passport. Two things worth doing:

  • Lock the PDF with a password — AES-256 encryption, and you send the password by a different channel. Many institutions expect this.
  • Check the metadata before sending it outside your organisation, and clear anything you’d rather not share.

Fixing a scan you already have

Ready? Open the free Scan to PDF tool on your phone — no app, no sign-up, no watermark, and your photos are never stored.

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