E-Signature & Sign PDF

In most jurisdictions an electronic signature does not have to be cryptographic to be valid — what matters is intent to sign and evidence of it, which is why a signed PDF is routinely accepted. What PDFixel produces is that kind of signature: your mark drawn onto the page, plus an optional summary page recording the signers as entered, when each placed their mark, and the SHA-256 fingerprint of the file you uploaded. What it is NOT is a certificate-based digital signature: there is no /Sig dictionary, no identity certificate and no trusted timestamp, so a reader will not show a green "signature valid" badge and the file cannot prove on its own that it has not been altered since. If your counterparty specifically requires a qualified or certificate-based signature — some tenders, land registries and regulated filings do — you need a provider that issues certificates. For an NDA, a contract, an invoice approval or a form, this is the normal thing people use.

Multiply blending combines the ink with whatever is underneath it rather than covering it, so the mark reads as though it were written on the page instead of pasted over it — which matters most on a scan, where the paper has its own texture and tint. It is on by default. Switch to Standard for a mark that has to be fully opaque, such as a stamp placed over existing text.

Yes. Switch to Several Signers, add participants as Signer, Approver, CC or Witness, and each gets its own colour so you can see at a glance whose fields are whose. One thing to be clear about: this prepares and labels the document, it does not send anything. There is no email step and no per-signer link — you fill the fields here, or circulate the PDF yourself. The summary page records each participant's role and whether their fields were completed.

The document title and page count, a reference ID generated for this session, the SHA-256 fingerprint of the file as you uploaded it, the completion time from your computer's clock, each participant's name, email and role as typed, whether they placed a signature mark and when, and the most recent entries from the activity log. It does not record an IP address, a device fingerprint or a location — nothing running in your browser can observe those, and inventing them would make the page worse than useless. The log and the signer list are trimmed to fit one page, and the page says so when it has left anything out.

Yes. Sign a white sheet, photograph it, and upload the image: pixels brighter than roughly 80% white are made transparent and the result is cropped to the ink, so you get a clean mark with no white box around it. The threshold is fixed rather than adjustable, which means good lighting matters — an evenly lit, high-contrast photo works well, while a grey or shadowed background will not knock out cleanly. A dark pen on plain white paper gives the best result.

It does now — the button switches to "Re-sign with your changes" as soon as you edit anything after signing, and you need to press it to produce a new file. Previously the button stayed on Download after the first signing run, so any further edit updated the preview and could not reach the file you downloaded.