Why did my file fail to convert?

1. File Too Large

Cause: Your file exceeds the upload limit for your plan tier.

Size limits by tier:

• Free — 25 MB per file
• Pro — 200 MB per file
• Business — 1024 MB per file

Solutions:

• Compress the image before uploading (reduce resolution or quality)

2. Unsupported Format

Cause: The file extension or MIME type doesn't match what the converter expects.

Common mistakes:

• Trying to convert a PNG to JPG using the "HEIC to JPG" converter (use "PNG to JPG" instead)
• File renamed with wrong extension (e.g., photo.jpg but actually a PNG)
• Using an obscure or legacy format variation (e.g., TIFF instead of JPG)

Solutions:

• Double-check you're using the correct converter for your input format
• Verify the file's actual format (on Windows: right-click → Properties; on Mac: Get Info)
• If your format isn't supported yet, let us know and we'll consider adding it

3. Corrupted or Invalid File

Cause: The file failed integrity checks or our processing pipeline couldn't decode it.

Common causes:

• Incomplete download from camera/phone/cloud storage
• File truncated during previous transfer
• Filesystem corruption
• Deliberately malformed file (e.g., renamed text file as .jpg)

Solutions:

• Re-download or re-export the original file from its source
• Try opening the file in an image viewer to verify it's valid
• If the file opens elsewhere but fails here, report the issue with a sample (if not sensitive)

4. Batch Size Exceeded

Cause: You're trying to upload more files than your plan allows in a single batch.

Batch limits by tier:

• Free — 50 files per batch
• Pro — 200 files per batch
• Business — 1000 files per batch

Solutions:

• Split your files into smaller batches
• Use the API for automated large-scale conversions (Enterprise)

5. Queue at Capacity

Cause: The job queue has reached its bounded limit (1000 pending jobs).

This is rare and only happens during extreme load or if workers are temporarily offline.

Solutions:

• Wait 30-60 seconds and try again (queue typically clears quickly)
• If persistent, check status.tools.fast for incidents

6. Daily Limit Reached

Cause: Free tier users (including guests) have daily conversion limits (50 conversions/day).

Solutions:

• Wait until tomorrow (limits reset at midnight UTC)
• Create a free account to get your own credit pool (guests share an IP-based allowance)
• Upgrade to Pro for monthly credit pool (higher limits)

7. Resolution Too High

Cause: Your image exceeds 100 megapixels (e.g., 10000×10000).

This limit prevents resource exhaustion attacks while supporting up to 8K images and medium-sized panoramas.

Solutions:

• Downscale the image to 100 MP or less (e.g., 10000×10000 max)
• For gigapixel panoramas, contact support for Enterprise processing options

8. Account or Credit Issues

Cause: Your account has run out of monthly credits or has a billing issue.

Solutions:

• Check your credit balance at accounts.fast
• Upgrade to a higher plan for more monthly credits
• Purchase additional credit top-ups (coming soon)
• If account suspended, resolve billing issues in account settings