Sensitive documents stay on your device
Paperwork is where the most sensitive information you have lives: tax numbers, bank details, passports, medical records. Many free online converters upload files to process them. Every tool here runs inside your browser instead, so the document never leaves your computer or phone.
When you do send copies of ID, a watermark stating the recipient and date makes a leaked copy much less useful, and a solid box over details you were not asked for is a reasonable precaution.
For capture tips and the PDF-versus-JPG question, see scanning documents with your phone.
Questions people ask
How do I get a document under 2 MB?
Resize to about 2000 px on the long edge and compress at quality 80. Converting text pages to greyscale helps too.
How do I make a transparent signature?
Photograph it on white paper, convert to black and white, then remove the white background and save as PNG.
Is it safe to convert my passport scan here?
The file is processed in your browser and never uploaded, which is safer than server-based converters.