This one needs an upload, and is deleted afterwards
Browsers cannot do this calculation, so the file goes to our server. It is deleted automatically 60 minutes after the job finishes, and the working copy lives in a memory filesystem that is wiped whenever the server restarts.
We do not log file names and do not log file contents — that is a hard rule in our engineering standards, not a setting.
What it does — and what it doesn't
Ticking lock is recommended. If only values are written without generating appearances, many readers show blanks or mojibake — especially for CJK. Locking draws the values into the page and removes the fields, so every viewer shows them.
Locked means no further edits. Save an unlocked copy if you might need to change something.
A PDF with no form fields cannot be filled — use Add a text box instead.
Signature fields are not handled here; use Signature stamp.
Common questions
I filled it in but they say it looks empty.
It was not locked. Their reader is not generating field appearances. Fill it again and tick lock.
How do I know if a PDF has form fields?
Drop it in — the fields are listed if there are any, and you are told if there are not.
