Get your files ready for any upload form.
Shrink photos and PDFs to the exact size a form asks for, hide private details, make passport photos and more. It all happens on your device, so nothing is uploaded.
What do you want to do?
0 files uploadedFree, no sign-upWorks offlineJPG, PNG, HEIC, WebP, PDF
Hide an invisible watermark in a photo
Hide a short text, like your name or an ID, inside a photo. It cannot be seen, and only your secret word reads it back, so you can show a photo is yours.
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Not quite right? Drag the photo to move it, and zoom to fit your head.
What does the form ask for? Fill in only what it mentions.
Drag the picture to choose what is kept, and zoom to fit.
Page shape
Tidy up
Selected picture
1Make your signature
Sign on plain white paper with a dark pen, and photograph it flat. The paper is removed, so only the ink is kept.
2Tap the page where it goes
Each file smaller than
Save as
Background
Ready-made
Or make your own
See-through keeps only the person. It is saved as a PNG, the type that can have no background.
Make it smaller than
Save as
Make it look scanned
Printing it yourself?
Get a sheet of copies to print at home or at a photo shop, then cut them out.
How to do it
- Add your photo.
- Type a secret word and the text to hide, then download the marked photo. It looks the same.
- Later, add any copy of the photo, choose Check for a mark, and type the same secret word.
Questions
What does the mark survive?
Saving as JPG again, even at low quality, resizing, sharing apps that shrink photos, brightness and contrast changes, mirroring or turning, and cropping away up to about half of the photo. In tests it still read back after all of these.
What removes it?
Cutting the photo down to a small piece removes it, and so can heavy editing. Pages that are mostly plain white hold a weaker mark, which may not survive a crop. The app checks every saved file and tells you if the mark did not take.
Can someone else read or find the mark?
Not without your secret word: it sets where and how the text is hidden. No watermark is impossible for a determined expert to disturb, so treat it as strong evidence, not as a lock.
What if I forget the secret word?
The mark cannot be read without it, and the word is never stored or sent anywhere. Write it down somewhere safe.
Are my files uploaded anywhere?
No. Everything happens inside your browser, on your own phone or computer. Your files never leave your device, which is why it also works with no internet once the page has loaded.