You open a PDF, try to change one word, and the cursor refuses to land. Either nothing happens, or your tool grumbles about permissions, or the text won't select. Here's how to diagnose and fix each cause.
It's a flat page, not a form
Most PDFs aren't designed for editing — they're export-only. Text on the page isn't typeable; it's painted on. Solution: open in Flint's editor, which lets you add text on top of any page regardless of how the file was made. Click where you want to write, type. Save. Looks identical to a fillable form to anyone receiving it.
It's locked against editing
If your editor opens the file but refuses to save changes, the sender added permissions restrictions. Look for a padlock icon. If it's your file and you've lost the password, unlock PDF lifts permissions locks in seconds. If it isn't yours, ask the sender for an editable copy — far quicker than working around the lock, and the sender usually didn't realise they'd locked it.
It's a scan masquerading as text
Scanned PDFs look like text but are actually images. You can't change letters that don't exist as letters. Open the file in Flint, run OCR to add a real text layer, then edit normally. The original image stays visible underneath so the page still looks like the original. If you're editing a scanned contract with handwritten signatures, OCR the typed parts but leave signatures alone — they aren't text to OCR.
FAQ
Why does the same PDF work for the sender but not me?
Their version is the source (Word, Pages). They edit there and re-export. Once it's PDF, editing is harder. Ask for the source file if you need full editing freedom.
Can I overwrite locked text by drawing over it?
You can cover it with a white rectangle and type new text on top — a common workaround. Works fine visually; the original text remains in the file behind, so don't use this for sensitive removal — use redact instead.
Will edits look obvious?
Done well, no. Match fonts (use a system font like Arial), align carefully, and the edit blends. Flatten before sending so the additions can't be pulled off.
Most 'uneditable' PDFs become editable in Flint — text-on-top, OCR, unlock as needed.