Fix Image Upload Errors
Test the file, format, browser, and connection in a deliberate order to isolate an upload failure.
Overview
An upload can fail before processing begins. The most common causes are an unsupported file type, a file outside the tool’s limits, a damaged image, or a browser that blocks file access.
Start with one small, ordinary image. A clean test prevents a batch or complex file from hiding the real cause.
Diagnose an upload that fails or stalls
- 1
Confirm the selected tool
Open the tool intended for the image task and review the formats it accepts.
- 2
Check the file itself
Open the image locally. If it cannot be viewed on your device, export a fresh copy from the original application.
- 3
Check type and size
Use the actual image format and stay within the file-count and size limits shown by the tool.
- 4
Upload one small test image
If the test succeeds, add the original files one at a time to identify the file that causes the problem.
- 5
Test the browser and connection
Reload, allow JavaScript and file access, disable interfering extensions, and try a stable network or another current browser.
Tips for a better result
Export instead of renaming
Changing a filename extension does not convert the image data. Use an image editor or conversion tool.
Use local files
Cloud placeholders may need to finish downloading to the device before a browser can upload them.
Simplify the filename
A short filename can help rule out issues caused by unusual control characters from another system.
Common mistakes to avoid
Retrying the full batch
One damaged or oversized image can make the whole group harder to diagnose.
Refreshing during transfer
Reloading the page cancels an upload that is still in progress.
Troubleshooting
The file is reported as unsupported
Verify its real format in the source application and export it as a format accepted by the selected tool.
The upload stays at the same percentage
Wait briefly, then test a smaller file and another network. A proxy, VPN, or unstable connection can interrupt the transfer.
File selection opens but nothing appears
Confirm JavaScript is enabled and retry without a content blocker or from a different browser profile.
Frequently asked questions
Why can I upload one image but not another?
The failing image may use a different format, exceed a limit, be incomplete, or contain data the browser cannot decode.
Does changing .heic to .jpg convert the file?
No. Renaming the extension leaves the underlying format unchanged.
Wasn’t this the answer?
Send the tool, browser, and exact error to our support team.