Photo or signature rejected on an online form? 7 fixes
By the Toolbenchly team ·
Few things are as frustrating as filling in a long application form and then failing at the last step because the portal won't accept your photo or signature. The error messages are often vague. Here are the seven most common causes and how to fix each one in a minute.
Before anything else: open the official notice or the instructions page of the portal and write down the exact rules: dimensions (pixels or cm), minimum and maximum KB, and file format. Rules change between exam cycles, and websites that list "the" size for an exam are often out of date.
1. "File size exceeds the maximum limit"
The most common error. A phone photo is 2–5 MB; forms often allow 20–50 KB for a photo and 10–20 KB for a signature. Use the Exam Photo & Signature Resizer: enter the pixel size and the KB range and it produces a JPG that fits both. If the form only gives a KB limit, use Compress to 50 KB or 20 KB.
2. "File size is less than the minimum"
Surprisingly common with signatures. A clean black signature on white paper, resized to 140×60 pixels, can be just 4–6 KB, but the form demands at least 10 KB. Raising the JPG quality alone often isn't enough. The Signature Resizer fixes this by padding the JPG file up to the minimum with harmless comment data. The picture is identical, and the portal's size check passes.
3. "Invalid dimensions" or "image must be 200×230"
The file is the right size in KB but the wrong size in pixels. Resizing with "keep aspect ratio" turned on usually causes this: a 4:3 phone photo can't become exactly 200×230 without cropping. Use a tool that crops to fill the exact dimensions, like the exam resizer or the Image Resizer with aspect ratio unlocked. Don't stretch the photo; distorted faces are a common reason for later rejection.
4. "Invalid file format" or "only JPG allowed"
iPhones save photos as HEIC, and screenshots are PNG. Renaming photo.heic to photo.jpg does not convert it, and the portal will detect it. Convert properly with HEIC to JPG or PNG to JPG. To avoid it in future, set your iPhone to Settings → Camera → Formats → Most Compatible.
5. The photo is accepted but rejected later
Manual verification checks the content, not just the file: a recent colour photo, plain light background, face clearly visible and straight to camera, no cap or sunglasses, nothing cut off. Retake the photo facing a window in daylight against a plain wall, rather than trying to fix a bad photo with editing.
6. The signature is unreadable
If the signature fills only a small part of the image, it becomes a few grey pixels after resizing to 140×60. Crop tightly around the ink first with the Image Cropper. Use a black pen on plain white paper, and don't sign in capital letters if the notice forbids it (bank forms usually do).
7. The upload button does nothing or the page times out
This is often a portal problem during peak days near the deadline, not your file. Try a different browser, clear the browser cache, switch from mobile data to Wi-Fi (or the reverse), and avoid the last two days before the deadline when possible. Keep a copy of your ready-to-upload files so you can retry quickly.
Checklist before you upload
- Format is JPG/JPEG (for documents, PDF if the form asks).
- Pixel dimensions match the notice exactly.
- File size is inside the minimum–maximum KB range.
- Photo: recent, light plain background, face centred and clear.
- Signature: black ink, cropped close, readable at full size.
- Documents as PDF under the limit: use Compress PDF to 200 KB or 100 KB.