Scanning a Passport or ID Card to PDF: Settings That Keep It Sharp and Under the Limit

Almost every visa, immigration, and background-check upload starts with the same file: a scan of your identity document. And it fails for exactly four reasons — wrong resolution, grayscale instead of color, a cropped machine-readable zone, or a file bigger than the portal allows. All four are set at scan time, in about two minutes, and all four are avoidable.

Which pages to scan

Not every application wants the whole booklet. Scan what your checklist asks for — no more, no less:

Over-scanning has a cost beyond effort: every unnecessary color page at high resolution pushes the file toward the portal cap. Under-scanning costs worse — a returned application. The checklist decides.

The four settings that matter

Visa-preparation guides converge on the same four requirements, documented in detail by findmyvisa's passport scanning guide and corroborated by eVisa portal guidance:

Two details applicants miss: reflections from the laminate's holographic features are acceptable, but glare that obscures text is not — kill the flash and use soft, even light. And the page must lie flat; a curled passport photographed at an angle produces keystoned text that no compression setting can fix. (One applicant-favorite trick for stubborn booklets: a sheet of glass from a picture frame to hold the page flat.)

Flatbed scanner versus phone

A phone scan that is flat, straight, evenly lit, and checked at full zoom passes. A phone snap taken at an angle on a patterned bedspread does not. The device matters less than the discipline.

The file-size problem

Here is where scans die. Phone scanner apps often default to high-DPI capture that produces 5–10 MB single-page PDFs, and a full color scan of every passport page can run past 50 MB — applicants on the r/ukvisa forum report exactly this wall, with some resorting to screenshotting pages into PowerPoint to squeeze under the cap. Do not do that. Work the ladder instead:

1. Scan at 300 DPI, not 600. This single choice roughly quarters the raw size with zero visible loss on text.
2. Upload per category where the portal allows it. Most portals cap each file individually, not the total — the passport scan only needs to fit on its own. The per-portal caps are in our UK visa guide, NVC guide, and IRCC guide.
3. Merge multi-page scans in order, then compress once. Combine the pages with the merge tool, then reduce the result with the compress tool. For the full workflow, follow how to reduce PDF file size online for free.
4. Split only as a last resort. If one file cannot fit, divide it where the portal permits multiple uploads — never by degrading the bio page below legibility.

The rule that governs everything: a legible file near the cap beats a blurry file well under it. After any compression, zoom to 200 percent and read the passport number, the dates, and both MRZ lines. If the numbers are soft, the file is not ready. And because a passport scan carries your full identity, the kind of tool matters — online, desktop and AI compression compared sets out which approaches keep the file on your device. For the resolution theory behind the 300 DPI rule, see what DPI should I scan at.

Do not confuse the scan with the photo

Visa routes ask for two different images, and mixing them up wastes days:

• The document scan (this guide): your existing passport page, captured at 300 DPI in color, submitted as PDF or JPG.
• The visa photograph: a new portrait taken to a strict spec — for the GOV.UK digital route, JPG at least 600×750 pixels and between 50 KB and 6 MB, plain background, no alteration. See our UK visa guide for that spec.

A scan of your old passport photo is not a visa photograph, and a selfie is not a document scan. Prepare each against its own specification.

Capture checklist

Whether scanner or phone, run the same routine:

1. Clean the glass or lens; wipe the passport page.
2. Lay the page flat on a dark, non-reflective surface.
3. Set 300 DPI and color (scanner) or the highest document mode (app).
4. Light evenly from the sides; flash off.
5. Capture straight from above — all four edges, both MRZ lines, no fingers.
6. Check at full zoom: photo, name, number, dates, MRZ lines all crisp.
7. Save as PDF (multi-page) or JPG (single page), filename by content.
8. Compress only if over your portal's cap, then re-verify the digits.

Official and reported sources

• How to scan your passport for a UK visa — 300 DPI color, full MRZ, all four edges, grayscale rejected, equipment comparison
• Passport scan requirements for eVisa applications — corroborating capture spec: color, corners, MRZ legibility, JPEG/PNG/PDF
• UK visa document upload at VFS Global — third-party walkthrough reporting the self-upload spec (PDF, unencrypted, size and DPI bounds)
• VFS Global UK visa process — self-upload versus assisted scanning, originals still required at the appointment
• Applicant reports on TLScontact totals and the 50 MB passport-scan problem — forum threads documenting real file-size pain; treat figures as reported, not official

Portal rules change without notice. If a submission matters, confirm the current requirement on the upload page itself rather than trusting a table — including this one.

Before you upload

• ☐You scanned the pages your checklist names — always the bio page
• ☐300 DPI, full color, all four edges, both MRZ lines legible
• ☐No glare over text, no fingers, no watermark across the page
• ☐The file is under your portal's cap with ~15 percent margin
• ☐Digits verified at 200 percent zoom after any compression
• ☐You used a tool that keeps the scan on your device
• ☐You kept the original scan and saved the portal confirmation