File Formats Accepted for KYC Uploads: A Complete Guide for UK Casino Players

Know Your Customer (KYC) verification is a mandatory requirement at every reputable UK online casino. When you submit identity and address documents, the file format you choose makes a real difference, it can mean the difference between quick approval and frustrating delays. We’ve put together this guide to walk you through exactly which formats work, what specifications matter, and how to avoid common pitfalls that hold up your account verification.

Why File Format Matters for KYC Verification

You might assume any file format works as long as the document is readable. That’s not quite right. UK casinos use automated scanning systems and compliance software that only accept specific file formats. Submit the wrong format, and the system rejects your file outright, or worse, it accepts it but the verification team can’t process it properly.

File format matters because it affects:

• Compression and file size: Large, uncompressed files get rejected automatically by many platforms.
• Document clarity: Certain formats preserve image quality better than others, ensuring your documents are legible.
• Compliance scanning: Regulatory software reads only recognised formats: obscure ones create processing bottlenecks.
• Mobile compatibility: Many players upload from phones: some formats don’t transfer cleanly across devices.

We recommend using standard formats that every major casino accepts. This dramatically speeds up your verification and keeps your account in good standing from day one.

Image Formats: PDF, JPG, and PNG

Three formats dominate KYC uploads across UK casinos: PDF, JPG, and PNG. Each has its strengths, and knowing when to use each one saves time and prevents rejection.

Document Specifications and Quality Requirements

PDF files are the gold standard for document uploads. They preserve formatting, stay legible after compression, and comply with every casino’s compliance system. Export your scanned documents directly as PDF whenever possible.

JPG (JPEG) works well for photographs of documents. It compresses files significantly without visible quality loss, a document photo at 80–90% quality looks perfectly legible while staying well under size limits. File size typically ranges from 100 KB to 2 MB, which most casinos accept without issue.

PNG is less common but still accepted. It preserves every pixel perfectly, which sounds great until you realise PNG files are often 3–5 times larger than JPG for the same image. We suggest PNG only if your casino explicitly allows it and you’re uploading from a fast connection.

Key specifications:

Resolution should be at least 300 DPI for scanned documents, this ensures text remains sharp and readable by automated systems.

Accepted Identity Documents and Proof of Address

UK casinos require two types of proof: identity and address verification. Different documents have slightly different format requirements, though the core acceptable formats remain the same.

Identity documents (passport, driving licence, national ID card):

• Submit as colour PDF or JPG
• Include both front and back (two separate uploads or one combined PDF)
• Ensure all security features are visible
• Keep file size under 5 MB per document

Proof of address (utility bill, council tax letter, bank statement):

• PDF format preferred for official documents
• JPG acceptable if you’re uploading a phone photo
• Must show your name and current address clearly
• Must be dated within the last three months
• File size under 3 MB

Some casinos allow you to upload proof-of-address documents with minor redaction of sensitive financial details, but always check their specific guidance before editing. Upload the original format whenever possible to avoid compliance flags.

One common oversight: ensure your document name doesn’t contain special characters. Use simple naming like “passport_front.pdf” or “utility_bill.jpg” rather than “My_Passport_(Final)_[EDITED].pdf”. This prevents system errors during processing.

Common Technical Issues and How to Avoid Them

We see the same technical problems repeatedly. Learning to spot and prevent them keeps your submission smooth.

Issue: File is too large. Most casinos cap uploads at 5–10 MB per file. If you’re scanning documents, use your scanner’s “lower quality” or “web” setting rather than “highest quality”. This cuts file size in half without affecting readability.

Issue: Image is rotated or upside down. When you photograph a document with your phone, rotation data sometimes doesn’t translate across platforms. Always preview your file before submission. Most phones let you rotate right in the camera app before uploading.

Issue: Document is too dark or too bright. Poor lighting during phone photography causes rejection. Photograph documents on a white surface under natural light, angled to avoid glare. Use your phone’s built-in document scanner app (Google Drive scan, iPhone Notes scan), these automatically adjust brightness and contrast.

Issue: Wrong format selected by mistake. Converting between formats sounds simple but often goes wrong. Use proper conversion tools: for scans, export directly from your scanner software as PDF: for photos, use your phone’s native export function rather than third-party apps.

Issue: File appears pixelated or blurry. This usually means your original scan or photo was low resolution. Rescan or retake the photo at higher resolution before uploading. Aim for at least 2000 × 2500 pixels for scanned documents.

Tips for Successful KYC Document Submission

Follow these practical steps to ensure your documents sail through verification:

1. Check casino requirements first. Every casino publishes its file format and size limits in the verification section. Spend 30 seconds reviewing these before you upload, it’s the single best time investment.
2. Use PDF for official documents, JPG for photos. This is our core recommendation. PDF = scanned official paperwork: JPG = documents photographed with your phone.
3. Test file size before uploading. Check your file’s size in your device’s file manager. If it’s over 5 MB, compress it using your scanner app’s quality settings or an online tool like TinyPNG (for images only, not PDFs).
4. Upload during business hours. Verification teams process documents faster during UK business hours (9 AM–5 PM). An upload at 11 AM often sees approval by afternoon: one at midnight waits until the next working day.
5. Provide clear, unobstructed images. Corners of documents must be visible: reflections and shadows should be minimal. If you need to redact sensitive data, do so carefully without covering important details like your name or address.
6. Include discowin login details if you’re using a promotional account. Some casinos ask for login credentials during verification to confirm account ownership.
7. Keep copies of what you submitted. Screenshot or save PDFs of your uploaded files. If there’s a dispute or request for resubmission, you’ll have proof of what you originally provided.

We understand KYC feels bureaucratic, but it protects you as much as the casino. These formats and specifications exist to secure everyone’s data and meet UK gambling regulations. Follow them, and your account verification becomes a straightforward process rather than a source of frustration.