TL;DR
Visa and immigration portals are unforgiving about format in a way most systems aren't. A perfectly good application gets bounced because a file is 3MB over a cap, or because the portal wanted one PDF per category and got twelve JPGs, or because a filename had a space in it.
The format rules are usually the easy part — they're published, they're specific, and meeting them is mechanical. The problem is that they're published in a PDF nobody reads until after the first rejection.
This post covers the mechanics: what the caps typically are, how to get under them without destroying legibility, how to structure a pack, and — the part that actually matters — why you should not upload these particular documents to a free online converter.
Convert: Anything to PDF merges and converts entirely on your machine. Convert: Web to PDF captures the online pieces — bank portals, booking confirmations, employer letters in a webmail thread — including behind a login.
Read your specific portal's rules. Requirements differ by country, visa class, and year, and they change. Nothing here overrides the guidance for your application, and none of it is immigration advice.
Why format rejections happen so often
Immigration systems are high-volume and heavily automated at intake. A file that doesn't parse doesn't get a human's judgement — it gets an automated rejection, and often a generic error that doesn't tell you which rule you broke.
The recurring causes:
- Size caps per file and in total. Phone photos and scanner defaults blow past them instantly.
- One-document-per-category expectations. You have six payslips; the portal wants one "payslips" file.
- Filename restrictions. Spaces, accented characters, and special characters are commonly rejected.
- Page limits per document, especially for financial evidence.
- Format allow-lists. Many portals accept PDF and JPG only.
- Password-protected PDFs. Bank statements often download locked. A locked file can't be read by the intake system.
That last one catches a lot of people and it's worth checking before anything else — if your bank's PDF asks for a password when you open it, the portal can't open it either.
Getting under the size cap without ruining legibility
The instinct is to compress hard until the number is small enough. That's how you get a rejection for illegibility instead of size — worse, because it takes longer to find out.
Where the size actually comes from
Almost always images. A scanned page at 600 DPI in colour is enormous; the same page at 200 DPI in greyscale is a fraction of the size and completely readable.
Practical targets for document scans:
| Document type | Resolution | Colour |
|---|---|---|
| Text documents (letters, statements, contracts) | 200–300 DPI | Greyscale |
| Documents with stamps or seals | 300 DPI | Colour |
| Passport and ID pages | 300 DPI | Colour |
| Photographs of physical items | 1500–2500px long edge | Colour |
Greyscale is the underused lever. A text document in greyscale is typically a third to a quarter the size of the same scan in colour, with no loss of readability. Keep colour only where colour carries information — a stamp, a seal, a signature in blue ink that needs to be distinguishable from a photocopy.
The order of operations that works
- Scan or photograph at sensible settings — don't scan at 600 DPI colour and compress afterwards
- Crop to the document edges — cropping away desk and shadow removes real bytes
- Convert to greyscale where colour isn't needed
- Resize if still large
- Then merge into a PDF
Doing it in this order gets you a small, legible file. Doing it backwards gets you a small, unreadable one.
If you're photographing rather than scanning
Phone photos of documents are accepted by many portals and rejected by some — check yours. If allowed:
- Flat surface, even light, no shadow from your own hand
- Shoot straight down, not at an angle
- Fill the frame with the document
- Check focus on the small print before you move on
- Use your phone's document-scan mode if it has one — it deskews and flattens automatically, and the output is much closer to a scan
Structuring the pack
Most portals want documents grouped by category, one file per category. A typical structure:
| Category | Usually contains |
|---|---|
| Identity | Passport bio page, previous visas, previous entry stamps |
| Financial | Bank statements for the required period, payslips, tax documents |
| Employment | Employment letter, contract, leave approval |
| Accommodation | Hotel bookings or host invitation and their proof of address |
| Travel | Flight reservations, itinerary, travel insurance |
| Purpose | Invitation letter, conference registration, university offer |
| Ties | Property documents, family documents, ongoing commitments |
The cover-sheet habit
Put a one-page index at the front of each category file: what's inside, in order, with dates. A caseworker reading forty applications a day will thank you, and it costs four minutes in a text editor before converting.
Naming
Assume the strictest rules and you'll never hit the issue:
- No spaces — use hyphens
- ASCII characters only — no accents, no non-Latin script
- Descriptive and predictable:
financial-bank-statements-jan-jun-2026.pdf - Keep it under about 50 characters
If your portal specifies a naming convention, use theirs exactly, including capitalisation.
Order within a file
Reverse-chronological for financial evidence — most recent first — unless told otherwise. That's the order a caseworker reads in: they want to know your current position first, then look back.
For everything else, chronological or logical order, with the most important document first.
Capturing the online pieces
A lot of the pack is never a physical document.
Bank statements. Download the bank's own PDF where one exists — that's the authoritative document, it's what the portal expects, and it typically carries the bank's own formatting and identifiers. Use the official download, not a screen capture.
Where the bank offers no PDF — some accounts only show statements as a web page — capture the page with Convert: Web to PDF. It works on logged-in pages because it converts what's rendered in your tab. Be upfront with yourself that this is a screen capture of your account view, not a bank-issued statement; if the portal requires a stamped or certified statement, you need to request one from the bank.
Booking confirmations. Airline, hotel, and rail confirmations. Where the provider offers an official PDF with a booking reference, take that. Otherwise capture the confirmation page.
Employer letters in email. Capture the email itself so the sender, address, and date are visible — a letter as a bare attachment loses the evidence that it came from the employer's domain.
University or conference registration pages. These expire and get taken down. Capture them now.
On official documents
Where an institution issues its own PDF — a bank, a government body, a university — use theirs. It carries identifiers, sometimes a digital signature, and it's what the portal is expecting. A browser-made PDF of the same page is a picture of information, not the issued document. We'd rather say that plainly than have you submit the wrong artefact.
Convert: Web to PDF's job here is everything else: the pages nobody issues a formal document for.
Why not an online converter for this pack
This is the section that matters most, and it's not a generic privacy pitch.
Consider what's in a visa pack: your passport bio page, your full financial history for six months, your employer's details, your home address, your travel plans with dates, your family's documents, and often your biometric photo.
That's close to a complete identity kit. Uploading it to a free web converter means it passes through infrastructure you don't control, under terms you haven't read, retained for a period you're trusting rather than verifying.
Reputable services do delete after a retention window. That's genuine and worth acknowledging. It's also not the same as the file never leaving your machine — and there is no technical reason it needs to, because merging PDFs and converting images is computation a browser can do locally.
There's a practical dimension too: free tiers cap file sizes at 5–10MB and conversions at two or three a day. A visa pack is exactly the workload that hits both caps, and you'll hit them at 11pm the night before a deadline.
Convert: Anything to PDF merges and converts on-device. No upload, no cap, no watermark. For this document set specifically, that isn't a nice-to-have.
Pre-submission checklist
- Every file opens without a password
- Each file is under the per-file cap
- Total is under the overall cap
- Page counts within any stated limits
- Filenames: no spaces, ASCII only, descriptive
- Every page legible when zoomed to 100%
- Financial documents reverse-chronological
- Cover sheet at the front of each category
- Formats match the allow-list
- Nothing rotated sideways or upside down
- Originals kept somewhere safe
On rotation: genuinely check this. A sideways page is a surprisingly common rejection reason, and it's invisible if you only ever look at thumbnails.
On originals: keep everything. Applications get queried months later, and reassembling a pack from memory is miserable.
Frequently asked questions
How do I get my documents under the file size limit without making them unreadable?
Fix it at the source rather than by compressing afterwards. Scan text documents at 200–300 DPI in greyscale rather than 600 DPI colour, crop to the document edges, and only keep colour where it carries information like a stamp or seal. Greyscale alone typically cuts a text scan to a third of its size with no loss of readability.
Should I submit one PDF per category or separate files?
Follow your portal's instructions exactly — most want one file per category with a cover sheet listing the contents. Where the portal doesn't specify, one file per category is the safer default, since it keeps related evidence together and reduces the number of uploads that can go wrong.
Can I use a screen capture of my online banking instead of a statement?
Only where the portal doesn't require an issued statement. Download the bank's own PDF if one is available — it's the authoritative document. If your bank only shows statements as a web page, capturing that page is better than nothing, but be aware it's a view of your account rather than a bank-issued statement, and some applications specifically require a stamped or certified original.
Is it safe to use a free online PDF merger for visa documents?
A visa pack contains your passport, six months of financial history, your address, and often family documents — effectively a complete identity kit. Uploading it means the file passes through third-party infrastructure for a task that can be done entirely on your own machine. Local conversion avoids the question altogether, and also avoids free-tier size and daily limits.
My bank statement PDF is password protected. What do I do?
The portal's intake system can't open it either, so it has to be resolved. Most banks offer an unprotected download option in their settings, or you can request an unprotected statement through their support. Removing the password yourself with a third-party tool means handling your financial documents through software you may not want in that position.
What resolution should I scan documents at?
200–300 DPI in greyscale for text documents, 300 DPI in colour for anything with stamps, seals, or a passport bio page. Above 300 DPI you're adding file size without adding legibility for a document that will be read on a screen.
Do I need to keep the original files after submitting?
Yes. Applications get queried weeks or months later, and reassembling evidence from memory is far harder than keeping a folder. Keep originals, the assembled PDFs, and a note of what you submitted and when.
Bottom line
Format rejections are the most avoidable failure in an immigration application, and they're avoidable mechanically: read your portal's published rules, scan at sensible settings rather than compressing bad scans, group by category with a cover sheet, use hyphenated ASCII filenames, and check nothing is password-protected or rotated.
Use the institution's own PDF wherever one exists. Use a browser capture for the pages nobody issues a document for.
And for this particular set of documents — passport, finances, address, family — keep the assembly on your own machine. It's the one document pack where "it never left my laptop" is worth the small amount of effort it costs.
Convert: Anything to PDF merges locally with no size caps or watermarks. Convert: Web to PDF captures logged-in portal pages. Both free, both entirely on-device.
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