What does "Flattening" a PDF actually mean?
Modern PDF files are highly complex and built using distinct layers. When you type your National Insurance Number into an HMRC self-assessment form, or paste a digital signature onto a tenancy agreement, those elements sit on transparent overlays "above" the actual document. If you email the file in this raw state, the recipient can easily click on your text boxes to modify, alter, or delete your sensitive data.
Absolute data protection and universal print compatibility
Flattening is the technical process of irreversibly melting all these floating layers into the base canvas of the document. Our tool acts as a digital press: interactive fillable fields, annotations, and signatures are permanently converted into standard, uneditable graphics. This renders your document completely tamper-proof and ensures it will display and print flawlessly on any device, completely eliminating missing font issues or vanishing signatures.
