You've prepared your documents, you click "Upload" — and get a red message: "File type not supported", "Something went wrong, please try again", or nothing at all, just a spinner that never stops. Worse, the file opens perfectly on your computer, so you have no idea what's wrong.
Government portals, job sites, visa systems and university application platforms check files far more strictly than the PDF reader on your device, and their error messages are usually vague. This guide collects the most common reasons uploads are rejected, ordered from most to least likely, with a way to diagnose and fix each one.
- Start with size: most rejections are a file over the limit. Compress with a margin — e.g. 190 KB for a 200 KB limit.
- Make sure it's a real PDF, not an image renamed to .pdf.
- Remove passwords and restrictions.
- Use a short English file name with no spaces or symbols:
Passport.pdf. - Still failing? Rebuild the file with Repair PDF or JPG to PDF, and try another browser.
Before you start: read the portal's requirements carefully
Many rejections are solved by one line that was on the page all along. Look on the upload page or in the help guide for:
- Accepted formats: PDF only, or PDF and JPG?
- Maximum size: 100 KB? 500 KB? 2 MB? Per file or total?
- Page count: some slots allow only one page (photo, signature, single-sided ID).
- Dimensions: occasionally, image slots specify pixel dimensions.
- Colour: is a colour document required?
Write these down before preparing any file.
Cause 1: the file is over the size limit
By far the most common. The gap can be tiny: a 205 KB file against a 200 KB limit.
Diagnose: right-click the file → Properties (Windows) or Get Info (Mac), or check file details on your phone. Compare with the limit.
Fix: 1. Use Compress PDF and choose target size. 2. Enter a number about 5% under the limit: 190 for 200 KB, 950 for 1 MB. 3. For very small limits use Compress PDF under 200 KB and follow How to compress a PDF to 100 KB.
Why the margin? Systems count kilobytes differently: some use 1,000 bytes, others 1,024. A "200 KB" file on your computer may be 204,800 bytes — more than the 200,000 bytes the portal expects.
Cause 2: it isn't really a PDF
Renaming photo.jpg to photo.pdf doesn't make it a PDF. The extension is just a label; the content is still a JPEG. Your computer may open it anyway because it recognises the content, but the portal checks the file's internal "signature" and rejects it.
The reverse also happens by accident: some phone apps "share as PDF" but actually send a different format.
Diagnose: open the file in a browser — if it shows as a picture rather than a paged document, be suspicious. For the technically minded: every genuine PDF starts with the characters %PDF-.
Fix: convert the image to a real PDF with JPG to PDF.
Cause 3: the file is password-protected or encrypted
PDFs can have an open password or restrictions on printing and editing. Many portals reject encrypted files because they can't inspect or display them to staff. Bank statements and documents from some systems arrive protected by default.
Diagnose: does it ask for a password when opening? Does "Secured" appear in the title bar?
Fix: open it with the password in a PDF reader and save an unprotected copy if the reader allows, or use Print → Save as PDF if printing is permitted. That's legitimate — it's your file and you have its password. Don't try to bypass protection on a file you're not entitled to open.
Cause 4: the file name
Names with non-Latin characters, very long names, or symbols like # % & ( ) ' and multiple spaces can break some older systems.
Bad examples:
- My Passport (FINAL copy).pdf
- CV final#2 .pdf
- IMG_20261106_143022_HDR_compressed_final.pdf
Good examples:
- Passport.pdf
- Jane-Doe-CV.pdf
- Bachelor-Degree.pdf
Fix: rename using only English letters, numbers and hyphens, and keep it short.
Cause 5: the file is partly corrupted
A download that didn't finish, a transfer that was interrupted, or a file produced by buggy software. It may open on your device because PDF readers are forgiving and silently repair small errors, while the portal validates strictly and rejects it.
Fix: 1. Try Repair PDF to rebuild its structure, then upload the repaired copy. 2. Or recreate it from the source: re-export from Word, or reconvert the images. 3. If it came via email or a messaging app, download it again.
Cause 6: too many pages
Some slots accept a single page (photo, signature, one side of an ID) or a set number.
Fix: remove unneeded pages with Delete PDF pages, or extract what's required with Split PDF. If an ID has two sides but only one page is allowed, put both sides into one image before converting.
Cause 7: the slot doesn't want a PDF
Some slots — especially photo and signature — accept only JPG or PNG.
Fix: convert the page to an image with PDF to JPG, then shrink it if needed with Compress image or Resize image. If the image is WebP or HEIC, convert it to JPG.
Cause 8: forms and interactive elements
PDFs with fillable fields, JavaScript or embedded attachments may be rejected for security reasons.
Fix: fill in the form, then "print" it to a new PDF to get a flattened copy without interactive fields. Or convert it to images and back to PDF — though text will no longer be selectable.
Cause 9: unusual PDF version or structure
Rarely, older systems reject newer PDF versions or certain compression features.
Fix: recreate the file differently. Running it through Compress PDF on light rewrites the file and may fix it. If not, strong compression rebuilds pages as images in a very simple file almost any system accepts.
Cause 10: the browser, not the file
Ad blockers, stale cache, an outdated browser or strict privacy settings can break upload buttons on some portals.
Fix, in order: 1. Try a private/incognito window. 2. Disable ad blockers for that site. 3. Try another browser — Chrome, Edge, Firefox or Safari. 4. Update your browser. 5. Try a computer instead of a phone, or vice versa.
Cause 11: an unstable or slow connection
Uploads on weak networks can drop before finishing, producing a generic error. Some portals also end sessions after inactivity, so uploads fail if you spent a long time on the form.
Fix: make the file as small as is sensible, use a more stable connection, save the form as a draft if possible, or refresh and sign in again before uploading.
Cause 12: server load or a portal problem
At peak times — the last day of an application window, say — the portal itself may be overloaded. Messages like "Server error", "500" or "503" mean the problem is on their side.
Fix: try at a different time (early morning works well) and don't leave applications to the last day. If it persists, contact the portal's support with a screenshot of the error.
Quick diagnosis table
| Message or symptom | Likely cause | First fix |
|---|---|---|
| "File too large" | Cause 1 | Target size with a 5% margin |
| "File type not supported" / "Invalid file type" | Cause 2 or 7 | Real conversion to PDF or JPG |
| "Unable to read/process file" | Cause 3 or 5 | Remove protection, or repair |
| Uploads but shows blank to staff | Cause 5 or 9 | Recreate the file |
| Spinner never finishes | Cause 10, 11 or 12 | Another browser, better network, different time |
| Generic error with no detail | Any | Work through from Cause 1 |
The nuclear option: rebuild the file from scratch
If you've tried everything, this sequence solves the vast majority of stubborn cases because it produces an extremely simple file:
- Convert the PDF to images with PDF to JPG.
- Convert those images back to a new PDF with JPG to PDF at A4.
- Compress it to target size under the limit.
- Give it a short English name.
- Upload from an up-to-date browser in a private window.
The only downside is that text becomes unselectable. That's fine for certificates and IDs, but matters for CVs — see How to make an ATS-friendly CV PDF.
Build a ready-to-go document kit
The best way to avoid future rejections is to prepare your core documents properly once, then reuse them. Create a folder called "Official documents" containing:
| Document | Original | Upload copy (≤ 200 KB) | Image copy (JPG) |
|---|---|---|---|
| National ID (both sides) | High-res colour PDF | Compressed grayscale PDF | JPG of the front |
| Passport | Colour PDF | Compressed PDF | JPG of the data page |
| Latest degree | High-res PDF | Compressed PDF | — |
| Transcript | High-res PDF | Compressed, grades still legible | — |
| CV | DOCX + text PDF | Text PDF (no strong compression) | — |
| Headshot | High-res JPG | Small JPG (e.g. 600 × 800) | — |
| Signature | PNG on white | Small JPG | — |
Name each file in plain English and add an issue date where useful: Passport-2026.pdf. Next time you apply, everything's ready at the right size.
Common error messages and what they mean
| Message | Most likely meaning |
|---|---|
| File too large | Over the limit — compress with a margin |
| Invalid file type | The real format isn't what's required, or the extension isn't allowed |
| Unable to process file | Protected, corrupted or unsupported structure |
| Session expired | You took too long — sign in again and retry |
| 500 Internal Server Error | A problem with the portal — try later |
| 503 Service Unavailable | The portal is overloaded — try at a quieter time |
| 413 Request Entity Too Large | Bigger than the server accepts, even if the page didn't state a limit |
| Uploaded, but shows blank | Partly corrupted file or missing font — recreate it |
Uploading from a phone: specific issues
The picker opens Photos instead of files: look for "Browse" or "Files" to reach your PDF.
Files from messaging apps: files received in WhatsApp and similar apps may be stored where the browser can't reach them. Save to Files or Downloads first, then upload.
Cloud storage: if the file lives in Google Drive or iCloud and isn't downloaded to the device, uploads may fail or crawl. Download it locally first.
Switching apps reloads the page: on some phones, leaving the browser to fetch a file and coming back reloads the form and loses your entries. Prepare files before opening the application form.
Small screens hide messages: the error may appear at the top of the page. Scroll up after each attempt.
When to contact support
If you've tried everything, contacting support beats retrying forever. Make your message useful:
- Service name and the step where the upload failed.
- The exact error text or a screenshot.
- File details: format, size in KB, page count.
- Device and browser: e.g. "Windows 11, Chrome" or "iPhone, Safari".
- What you've tried: compression, renaming, another browser.
- Your application or reference number, if they need it to follow up.
A message like that cuts the back-and-forth and gets you to a fix faster.
Prevention tips
- Prepare documents early, not the night before the deadline.
- Make a folder per application with ready files, clear names and suitable sizes.
- Keep high-quality originals and compressed upload copies.
- Scan with sensible settings from the start: grayscale, 150–200 DPI. See How to scan documents with your phone.
- Test one file first before preparing the rest the same way.
- Screenshot the confirmation after a successful upload.
FAQ
The file opens on my computer — why does the portal reject it?
Your PDF reader is forgiving and skips over minor errors, while the portal strictly checks structure, format, size and protection. The usual suspects: size, protection, a fake extension and minor corruption.
My file is 199 KB and the limit is 200 KB, but it's still rejected. Why?
Systems calculate size differently (1,000 vs 1,024 bytes per KB), and some add data during upload. Compress to 190 KB or less.
Can a non-English file name cause rejection?
Yes, on some systems. Always use a short English name without spaces or symbols.
The portal only accepts JPG and I have a two-page PDF. What do I do?
Convert each page to an image with PDF to JPG. If the slot takes one image, upload the required page, or combine both pages into one image with an image editor.
Does compressing a document make it less acceptable?
No — as long as it stays clear and fully legible. Rejection happens when a document becomes unreadable.
Are WPPR tools safe for government documents?
Yes. All processing happens in your browser; files are never uploaded to a server. You can verify this on our security page.
Bottom line
Upload rejections are rarely as mysterious as they look. Usually it's size, then the real format, then protection, then the file name, then corruption, then the browser. Work through them in order, and if nothing works, rebuild the file from images. Prepare documents early, with clear names and sensible sizes.
Start with Compress PDF on target size with a safety margin — free, and your files never leave your device.