Every year, millions of applicants uploading sensitive documents to government and financial portals make a dangerous mistake: they upload unredacted passports, SSNs, tax returns, and bank statements to "free" cloud-based PDF compressors.
When you use traditional online PDF tools, your file is uploaded to a remote server, processed in the cloud, and temporarily stored. For a casual flyer, that doesn't matter. For an immigration packet or mortgage underwriting file, it is a massive privacy risk.
Here is how modern Client-Side WebAssembly (Wasm) solves this problem completely inside your browser—with zero server uploads—along with exact specifications for the strictest portals in 2026.
1. US Visa (CEAC / DS-160 / USCIS) — Strict 2MB Limit
The U.S. Department of State CEAC portal strictly rejects any PDF over 2MB (2,048 KB). High-resolution color scans of civil documents or I-864 tax transcripts easily cross 10MB.
- Recommended Settings: 150 DPI resolution, Grayscale for text documents.
- 100% Client-Side Tool: Compress PDF for US Visa (Under 2MB)
2. Canada Express Entry & Study Permit (IRCC) — Strict 4MB Single-Slot Rule
Immigration, Refugees and Citizenship Canada (IRCC) only provides one upload slot per document category and caps each file at 4MB. Applicants must merge multi-year reference letters, paystubs, and T4s into a single file without exceeding 4MB.
- 100% Client-Side Tool: Compress & Merge PDF for Canada PR (Under 4MB)
3. UK Visa (UKVI / VFS Global / TLScontact) — 5MB Portal Limit
VFS Global document upload portals frequently time out when uploading multi-page tenancy agreements or 6-month bank statements over 5MB.
- 100% Client-Side Tool: Compress PDF for UK Visa (Under 5MB)
4. Mortgage Underwriting & IRS Tax Filing — Chronological Merging
Mortgage underwriters and CPAs require consecutive monthly bank statements, W-2s, and 1099s combined into a single audit-ready packet without altering original banking encryption or uploading account numbers to third-party servers.
- For Home Buyers: Merge Bank Statements for Mortgage Underwriting
- For Tax Season: Merge PDF for IRS Tax Filing
5. University & Civil Service Portals — Strict 200KB to 300KB Caps
Many university admission boards and job portals enforce ultra-tight caps between 200KB and 300KB.
- 200KB Target: Compress PDF to 200KB
- 300KB Target: Compress PDF to 300KB
Why Client-Side WebAssembly + Zero-Permission Chrome Extension?
We built PDFArenaArc so that every PDF operation—merging, splitting, compressing, redacting, and signing—executes 100% locally in your browser's RAM. You can literally turn off your Wi-Fi after loading the page, and the tools still work at full speed.
For daily workflows, we also published the official PDFArenaArc Chrome Extension on the Google Chrome Web Store with 0 permissions (it cannot read your browsing history or website data).
Try the full private suite for free at https://pdfarenaarc.com.
