When a PDF will not cooperate.

A failed conversion does not always mean the file is broken. The input format, password state, size, or layout may simply need a different approach. A short diagnosis is usually faster than repeatedly uploading the same file.

Check whether the source opens

Open the file in a normal PDF viewer. If it cannot open there, download it again from its source. A partial download can have the correct filename but incomplete contents. Changing an extension to .pdf does not turn another format into a PDF.

Read the error literally

A size warning means the upload exceeds the current limit: 200 MB in total. A wrong-format message means the chosen tool expects a different input. A password warning means you should use the authorized password workflow rather than retrying the locked copy.

When the server is busy, wait before starting another job. Repeated submissions can add unnecessary queueing.

Match the tool to the document

If a PDF opens but contains only scanned images, a normal text conversion may return little useful text. Try OCR to Word. If an extracted spreadsheet is messy, inspect the source table structure; a different conversion may not fix ambiguous rows automatically.

Try repair on a copy

Repair PDF may help some structural problems, but it cannot reconstruct content that is missing from the source. Save a separate copy before trying repair and compare the result page by page afterward.

Reduce the problem

If a long document repeatedly fails, test a smaller non-sensitive section. This can reveal whether a specific page or embedded object is the trigger. Keep a note of the tool, file type, approximate size, and error message. Those details are more useful for troubleshooting than sharing the entire private document.