Three clear steps
How it works
- 1
Find the accepted format, maximum file size, and any pixel limits on the destination form.
- 2
Enter those rules and choose the image that failed.
- 3
Workbox prepares and validates a new file so you can rule out common file-related causes.
Common reasons an image upload fails
A file may be too large, use an unsupported format, have invalid dimensions, be corrupted, or have a misleading filename extension.
A validated file removes those variables. If it still fails, the cause is more likely the website, connection, permissions, or an expired form session.
Tips for a reliable upload
- Refresh the destination form before retrying if it has been open for a long time.
- Use a simple filename without unusual symbols if the site is old.
- If a validated file still fails, try another browser or contact the website owner.
Frequently asked questions
Why does a JPG upload still fail?
The file may exceed size or dimension limits, or it may only be named .jpg without being encoded as JPEG. Workbox checks the actual file.
Can Workbox fix a broken website uploader?
No. It can prepare a compliant image. Browser, network, account, and website outages must be resolved on the destination site.
What should I enter in the requirements box?
Copy the allowed formats, maximum KB or MB, and any pixel dimensions shown near the original upload field.