PDF upload requirements: a checklist for job, visa and university portals
By the fullpdftools team · Updated
Quick answer: most upload rejections come from four things: the file is too large (fix it with Compress PDF), it is not a PDF (convert photos with Image to PDF and Word files with Word to PDF), the portal wants one file but you have several (use Merge PDF), or the PDF is password-protected. Read the portal’s exact rules first, then check your file against the list below.
Application portals for jobs, universities, visas, tax offices and insurance claims all ask for PDFs, and they all seem to have slightly different rules. The rules themselves are fairly predictable, though. This checklist covers the requirements you will meet most often and how to meet each one without losing readability.
The checklist
| Requirement | Typical wording | How to meet it |
|---|---|---|
| File type | “PDF only” | Convert images with Image to PDF, Word files with Word to PDF. Renaming .jpg to .pdf does not work. |
| Maximum size | “Max 2 MB”, “less than 500 KB” | Compress PDF; see the size table below |
| Single file | “Upload all documents as one PDF” | Merge PDF in the order the portal lists them |
| Page limit | “Maximum 2 pages” | Remove pages or extract the ones that count |
| No password | “Encrypted files cannot be processed” | Remove the password in the program that created the file, or request an unprotected copy |
| Readable scans | “Must be clear and legible” | Scan or photograph at 200–300 DPI, upright, with no glare; fix sideways pages with Rotate PDF |
| File name | “Use your surname and document type” | Rename before upload, e.g. khan-passport.pdf; avoid special characters |
Hitting a size limit
Size limits are the most common problem, because phone photos and colour scans are large. Here is roughly what fits:
| Limit | Realistic content | Suggested approach |
|---|---|---|
| Under 300–500 KB | 1–2 scanned pages, or a text-based CV of several pages | Compress at Recommended; if still too big, Extreme |
| 1–2 MB | About 3–10 compressed scanned pages, or a long text document | Recommended is usually enough |
| 5–10 MB | Most multi-page applications with scans | Often fine as is; compress only large photo-based files |
A CV or cover letter exported from Word is text, not pictures, and is typically well under 300 KB. If yours is several megabytes, a large photo or logo is the reason; compress it at Basic, which keeps the text selectable, before trying stronger levels. Our guide to reducing PDF file size explains each level.
Combining several documents into one upload
- Turn every photo or scan into a PDF first (Image to PDF).
- Put the files in the order the portal lists, for example: application form, passport, certificates, reference letters.
- Merge them with Merge PDF.
- Compress the merged file if needed. Compressing once at the end is better than compressing each part, because quality is only reduced once.
- Open the final PDF and check every page before uploading.
Make scans easy to read
- Scan at 200–300 DPI. Lower makes small print unreadable; higher only adds size.
- Grayscale is fine for text documents and makes files smaller. Use colour for photos, stamps and ID cards where colour matters.
- Include the whole page, all four corners. Officials often reject ID scans with cropped edges.
- Photograph both sides of ID cards when asked, and put them on one page or consecutive pages.
Our photos-to-PDF guide has more tips for using a phone as a scanner.
Before you press upload
- Open the PDF yourself. Check the order, orientation and that every page is present and readable.
- Check the size in your file manager (on Windows, the Size column; on Mac, Get Info; on phones, the file details).
- Remove anything not asked for. Unrequested pages slow down reviewers and add to the size.
- Keep a copy of exactly what you uploaded, with the date in the file name.
Frequently asked questions
How do I reduce a PDF to under 1 MB?
Open Compress PDF and choose Recommended. If the result is still above 1 MB, try Extreme, or remove unnecessary pages first. Text-only PDFs are usually already far below 1 MB.
Why does the portal say my PDF is invalid?
Common causes are a password-protected file, a file that was renamed from another format rather than converted, or a damaged download. Re-create the PDF with a converter and try again.
How do I combine my documents into one PDF for an application?
Convert any images to PDF, then add all the PDFs to Merge PDF in the required order and download the single combined file.
What DPI should I scan documents at for online applications?
200 to 300 DPI. It keeps small print readable while keeping the file small enough for most limits.
Is it safe to prepare ID documents with an online tool?
It depends on whether the tool uploads files. Our tools run in your browser and never upload your documents. Read our guide on checking whether an online PDF tool is safe.
Tools used in this guide
Merge PDF
Combine multiple PDFs into one document, in the order you choose.
Compress PDF
Reduce PDF file size for email and uploads while keeping it readable.
Image to PDF
Turn JPG, PNG, WebP and other images into a single PDF.