Calculator
What the Sign PDF does
Sign PDF: places a signature image or a typed name into the page content itself, defaulting to the last page where signatures normally go. Everything runs in your browser and the file is never uploaded.
The Sign PDF calculates the file you choose without uploading it anywhere. The work happens inside your browser tab, so there is no upload to wait for and no queue.
It is mostly used by someone splitting a long report. Most PDF chores are simple, yet the usual tools want an account and an upload first.
The document is read into memory by your browser and never uploaded, so private paperwork stays private.
The method, a field-by-field reference and a worked example built from the defaults are all on this page.
What do the Sign PDF fields mean?
The Sign PDF uses 9 inputs. The form opens pre-filled, so the fastest way in is usually to overwrite the one field you actually care about.
| Field | What to enter | Default |
|---|---|---|
| PDF File | stays on your device | none |
| Signature image (PNG or JPG, optional) | stays on your device | none |
| Or type a name to sign with | optional | Ada Lovelace |
| Pages (blank = last page) | optional | none |
| Position | choose from Bottom right, Bottom left, Bottom centre, Top right, Top left or Centre | Bottom right |
| Image width (% of page) | accepts 1 to 100 | 30 |
| Typed signature size (pt) | accepts 6 to 72 | 22 |
| Margin (mm) | accepts 0 to 100 | 15 |
| Add a dated rule underneath | choose from Yes or No | Yes |
How does the Sign PDF work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
Range checks come first, so the formula only ever sees values it can handle.
What a typical run looks like
You provide: PDF File, Signature image (PNG or JPG, optional), Or type a name to sign with, Pages (blank = last page), Position, Image width (% of page), Typed signature size (pt), Margin (mm) and Add a dated rule underneath
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: a download link for the new file and a short note on what changed.
Timing comes down to your own hardware, and the practical size limit is how much memory the browser will hand the tab.
How to use it
- Choose your file under PDF File, or drag it onto the drop area.
- Choose your file under Signature image (PNG or JPG, optional), or drag it onto the drop area.
- Enter Or type a name to sign with.
- Set Pages (blank = last page).
- Pick a value for Position: the options are Bottom right, Bottom left, Bottom centre, Top right, Top left or Centre.
- Key in Image width (% of page) (1 to 100).
- Fill in Typed signature size (pt) (6 to 72).
- Type Margin (mm) (0 to 100).
- Pick a value for Add a dated rule underneath: the options are Yes or No.
- Press Sign PDF.
- The panel reports Status, Pages Signed and Signature.
- Both Copy Link and Print capture the current state, so pick whichever suits how you file things.
What this tool does not do
- Very large documents are limited by your device memory, not by a server quota.
- Encrypted or password-protected files must be unlocked before they can be processed.
- Results are informational: check anything consequential against a second source.
- Confirm the units before you act on the output. The arithmetic is only as sound as what went in.
- Large files are limited by your available memory, not by an upload quota.
Frequently asked questions
The form asks for PDF File, Signature image (PNG or JPG, optional), Or type a name to sign with, Pages (blank = last page), Position, Image width (% of page), Typed signature size (pt), Margin (mm) and Add a dated rule underneath. A starting value is in place for each, which means a single edit is enough to get a meaningful answer.
Image width (% of page) accepts 1 to 100. If a value falls outside, the tool says which field is at fault instead of guessing.
Your file stays on your machine. Nothing is transmitted, stored or queued for processing elsewhere.
It costs nothing, and there is no limit on repeat use.
Full double precision is used throughout; only the displayed figure is shortened.