Most visa applications now happen online, and most of them involve uploading documents: passport pages, photos, bank statements, employment letters, invitations, travel bookings. Online visa portals are notoriously strict about file types, sizes and legibility, and a rejected upload can mean delays or a refusal. Here is how to prepare your PDFs so they go through cleanly.
Read the document checklist line by line
Each country and visa type has its own list, published on the official government or embassy site. Use only official sources, and note for each document:
- Whether it must be a colour scan.
- The maximum file size and accepted formats.
- Whether pages should be combined into one file.
- Whether a certified translation is required for documents not in the official language.
When in doubt, follow the most specific instruction for that document, not general advice from elsewhere.
Scan, do not photograph
A photo taken at an angle with shadows is the most common reason for an unreadable upload. Use a scanner or a phone scanner app that flattens and crops the page. See scanning documents with your phone.
For passports, scan the photo page with all four corners visible and no glare across the machine-readable lines at the bottom.
Use a sensible resolution
200 to 300 DPI is usually enough for text and ID pages. Higher resolutions produce large files without making anything more legible. See scanning resolution for documents.
Combine multi-page documents
A three-month bank statement or a multi-page employment contract should normally be one PDF, in page order, unless the portal says otherwise. See how to combine PDF files. Make sure every page is the right way up; see how to rotate a PDF page.
Compress to meet size limits
Visa portals often have small limits per file. Compress scanned PDFs until they fit, then open the result and check every number is still readable. Our guide to compressing a PDF for online application portals explains the settings.
These documents are among the most sensitive you own. A browser tool that works locally, such as Docento.app with its compress and merge tools, avoids uploading your passport and bank details to a third-party server just to resize them.
Do not edit the content
Never alter amounts, dates or names in a bank statement, letter or booking. Even an innocent correction can look like fraud, and visa authorities check. If a document is wrong, get a corrected version from whoever issued it.
Name files clearly
Use names that match the checklist: Passport-Lastname.pdf, Bank-statement-Jul-Sep-2026.pdf, Employment-letter.pdf. It helps you and any agent or official reviewing the upload.
Keep a complete copy
Before you submit, keep a folder with every file exactly as uploaded, and save the confirmation page as a PDF. You may need them for an interview, an appeal or your next application. For a broader list of what to carry, see travel documents PDF checklist.
Takeaway
Follow the official checklist exactly, scan rather than photograph, combine multi-page documents in order, compress until each file fits and is still legible, never edit content, and keep a copy of everything you submit.
