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How to Scan Certificates and Diplomas

By Scanner.cam Editorial Team · Updated 9 Nov 2026 · 6 min read

Quick answer

To scan a certificate or diploma, lay it flat on a plain background, capture it in bright even light, and save it as a PDF at full resolution. Certificates are larger than a phone screen and often glossy, so the two things that matter most are keeping the page flat and keeping glare off any foil seal.

How to Scan Certificates and Diplomas — Scanner.cam guide

A certificate is a document you will be asked for again and again — job applications, university admissions, visa files. One clean scan now saves a frantic search later, and a poor scan can be worse than none at all: a cropped corner or an unreadable seal is enough for a verification office to ask you to resubmit. This guide covers the capture, the oversize problem, and the format to save.

Before you scan: protect the original

Handle the certificate by the edges and keep it away from food, drink, and direct sunlight while you work. If it is framed, take it out of the frame — glass adds a second reflective surface and usually makes glare worse. If the certificate is rolled or curled, lay it face-down under a stack of heavy books for a few hours first; a curled certificate will not sit flat, and a scan of a curved page distorts the text at the edges. Never iron a certificate or press it with heat — the paper and any foil seal can be damaged permanently.

Scan a certificate in 6 steps

Clear a flat surface larger than the certificate, and lay down a plain dark cloth or sheet of matte card. The certificate should lie completely flat with no curl at the corners.
Light it evenly from the side. Use a desk lamp placed low and to one side, or soft window light — never an overhead light or the phone flash, which will glare on the paper and any foil seal.
Hold the phone directly above the centre of the certificate, parallel to it, and step back until the whole document is in frame with a small margin. Keep the phone steady — use both hands or rest your elbows on the table.
Check the corners and the seal on screen before capturing. All four corners must be visible, and the foil seal should be readable, not a white blob. Move the lamp slightly if the seal glares.
Capture with Scanner.cam in your browser and let the auto-crop find the edges. The tool straightens the page and produces a clean, flat image with no app and nothing uploaded.
Save as PDF at full resolution. A certificate is a formal document — a PDF is what admissions offices, employers, and embassies expect, and full resolution keeps the small print and the seal legible.

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Oversize certificates: scan in two halves and stitch

Many diplomas are larger than A4 — too big to fit in one phone frame at readable resolution. The fix is to scan it in two overlapping halves and join them:

Scan the top half, then the bottom half, with at least a third of overlap in the middle so the joining software has matching detail to align on.
Keep the phone at the same height and the same light for both halves. Different lighting between halves shows up as a visible seam.
Use a photo-stitching app or an image editor to merge the two halves — most free editors can align on the overlap automatically.
Check the join carefully: the text across the middle, the border lines, and the signature must line up with no doubling.
For a framed or mounted certificate you cannot flatten, two overlapping halves is still better than one distant shot — the distant shot loses the small print.

Dealing with foil seals, ribbons, and glossy paper

The foil seal is the part of a certificate most likely to ruin a scan. Foil is a mirror: point a light at it and it reflects straight back. Angle the light from the side, as in how to remove glare from glossy photos, and the seal will show its embossed detail instead of a white flash. Ribbons and raised seals cast shadows — soft, diffused light from two sides evens them out. Glossy certificate paper behaves the same way: side light, no flash, no overhead light. If the paper has a heavy texture, such as laid or watermarked stock, a slightly lower angle of light actually helps, because it brings out the texture without blowing out the print.

What format and resolution to save

Save the finished scan as a PDF — it is the format every institution accepts, it keeps multi-page sets together, and it prints at the right size. Keep a full-resolution master copy as well: a JPG or PNG at the phone's full resolution, filed with the PDF. When a form asks for a file under a size limit, make a smaller copy from the master rather than re-scanning at low quality. As a rule of thumb, the certificate's text should be readable when the PDF is viewed at 100% on screen — if you have to zoom in to read the small print, the capture resolution was too low. For the numbers behind that judgement, see what DPI to use for old photos.

Common mistakes to avoid

Cropping a corner. Verification offices check that the whole document is present — a missing corner can mean a rejected submission.
Scanning under glass. A frame or a glass sheet adds reflections and usually makes the result worse.
Using the phone flash. Flash glare on a foil seal or glossy paper hides exactly the details that prove the document is genuine.
Saving only a low-resolution copy. A small JPG looks fine on a phone screen and unreadable when an officer zooms in on the seal.
Scanning a curled certificate. Flatten it under books first — a curved page distorts text at the edges.

Frequently asked questions

How do I scan a certificate or diploma with my phone?
Lay it flat on a plain background, light it evenly from the side, hold the phone directly above the centre, and save as a PDF at full resolution. Keep all four corners in frame and keep glare off any foil seal.

What if my diploma is too big to fit in one phone photo?
Scan it in two overlapping halves — top and bottom, with at least a third of overlap — keeping the same height and light for both, then stitch them together in a photo editor and check the join carefully.

How do I scan a certificate with a foil seal without glare?
Angle the light from the side at roughly 30 degrees instead of from above, turn off the flash and overhead lights, and check the seal on screen before capturing. Side light shows the seal's embossed detail instead of a white flash.

Should I scan a certificate as a JPG or a PDF?
As a PDF — it is the format admissions offices, employers, and embassies expect. Keep a full-resolution JPG or PNG master copy as well, and make smaller copies from it when a form has a file-size limit.

Can I scan a certificate while it is still framed?
You can, but the result is usually worse: the glass adds reflections and the frame keeps the paper from lying flat. Take the certificate out of the frame, scan it, and put it back.

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