Initial signature size
- Input
- A4: 595 x 842 pontos
- Expected output
- 178,5 pontos de largura (30%)
The height follows the drawing's proportion, and the cap is 360 points.
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how to sign a pdf on your phone
It runs in the browser of an Android phone or an iPhone. Pick the PDF from your files, draw the signature with your finger and drag it into place. The file never leaves the device.
The height follows the drawing's proportion, and the cap is 360 points.
There are also dd/mm/yy, yyyy-mm-dd, mm/dd/yyyy and the long form.
In English the same format comes out as October 5, 2026.
The button showing the percentage returns to 100%.
No. pdf.js reads the PDF and pdf-lib writes it inside your browser, and the signature image never leaves the device. The signatures you choose to save live in this browser's localStorage, up to 24 images and 6 signers, and can be deleted one by one. Closing the tab discards the open document. Because nothing is uploaded, the tool is also fine for contracts and sensitive documents.
No. The tool runs in the browser, in Chrome on Android as well as Safari on iPhone. Nothing is downloaded besides the page itself and the signed PDF at the end.
No. Reading and writing the PDF happen on the device, and the signature image stays on it too. That holds even for contracts and personal documents.
It is a simple electronic signature, the image of your signature on the document. It may be accepted between parties who agree to use it, but it does not replace a certificate-based signature or the gov.br one when the law or the contract requires them.
Simple electronic signature. The tool writes an image of your signature onto the PDF. It is not a certificate-based digital signature (ICP-Brasil) and not an advanced gov.br signature.
A signature image on a document is the simplest type: on its own it proves neither who signed nor that the file stayed the same. It may be enough between parties who agree to use it, but it does not replace the qualified signature (ICP-Brasil certificate) or the advanced one when the law, an agency or the contract requires them.
Legal basis (Brazil): Law 14.063/2020, art. 4 (simple, advanced and qualified electronic signatures) and Provisional Measure 2.200-2/2001, art. 10 (ICP-Brasil certificates and other means accepted by the parties). For formal validity, sign in the federal government service (assinador.iti.br, with a silver or gold gov.br account) and verify at validar.iti.gov.br.
gov.br electronic signature · Verify a signed document (ITI)
All processing happens in your browser: the PDF and the signatures are never sent to a server. Saved signatures stay only in this browser and can be deleted at any time.