Sign a PDF on iPhone.
No app, no upload.
Safari can sign the document in about a minute — draw, type, or upload your signature, drag it into place, done. No app, no account, and neither the PDF nor your signature ever leaves the phone.
Short answer: open toolpantry.app/sign-pdf in Safari, choose your PDF, create a signature (draw it, type it, or upload a photo of it), drag it where it belongs, and download the signed file.
By the Tool Pantry team, October 2026. Tested with Chrome 130 on macOS using a 196.8 KB test PDF; Safari on iPhone uses the same browser APIs — if your iPhone behaves differently, tell us.
The steps
- In Safari, go to toolpantry.app/sign-pdf.
- Tap Choose one PDF and pick the document from Files.
- Create your signature: draw it with your finger, type your name, or upload a photo of your ink signature.
- Drag the signature into position over the signature line, and resize it with the slider.
- Signing a long agreement? Tick Add to every page.
- Tap Download signed PDF and save it back to Files.
The three signature styles, for reference:
- Draw — finger or stylus right on the screen; the most natural look.
- Type — pick a script style and get a tidy, consistent signature.
- Upload — a photo of your ink signature on plain white paper; the background is removed automatically.
The original PDF is never modified. If the placement looks off, run it again — there's nothing to undo because nothing was changed.
What this actually does
Your signature is stamped onto the page as an image. That keeps it simple and private, and it's what most everyday documents need — rental applications, school forms, permission slips, invoices you're approving.
Two honest limitations, because you'll want to know them before you sign a mortgage:
- It's a visual signature, not a certified digital signature. There's no certificate, no audit trail, no tamper-proofing. Banks and notaries sometimes require a certified e-signature service — for those, this tool is the wrong one. For the other 90% of PDFs, it's fine.
- Pages with an unusual rotated layout get skipped. The tool tells you when it skips one instead of stamping the signature in the wrong place.
Our test, with real numbers
We signed a 196.8 KB scanned document with a typed signature. The signed file came out at 210.5 KB — the signature image added about 14 KB, and the page count didn't change.
| What | Result |
|---|---|
| Original PDF | 196.8 KB |
| Signed PDF | 210.5 KB (+14 KB) |
| Placement | 1 page, positioned by drag |
| Engine download | about 1.7 MB, once per visit |
Fourteen kilobytes. If you were expecting signing to bloat the file, it doesn't — a signature is tiny next to the document it sits on.
Touches worth knowing
Drawing with your finger works better than you'd expect, but type it if you want it tidy. If you upload a photo, shoot it straight on, on plain white paper — the background remover is good but not magic. And if the portal then rejects the file for being too big, that's a different problem: run it through Compress PDF. Combining the signed page with attachments? That's Merge PDF.
Is it really free?
Yes. No account, no watermark, no page limits. The whole thing runs in your browser.
Can I draw the signature with my finger?
Yes — that's the default tab. A stylus or finger both work. You can also type it or upload a photo; all three produce a transparent PNG.
Is a signed PDF from this tool legally valid?
For most everyday agreements, a visible signature is what the other side is asking for. It is not a certified digital signature, though — contracts that explicitly require certification need a qualified e-signature service. Check what the document itself demands.
Does it work the same on a computer?
Yes, identical options. On desktop, drawing with a mouse works fine.