This fills in real, interactive form fields — it can't add fields to a PDF that doesn't have any.A scanned form is a picture, not an AcroForm: there is nothing here for this tool to find, and it says so plainly instead of pretending it worked. If your PDF does have fields, every one is listed so you can see exactly what you're filling in, and an optional "lock" step bakes the values in afterwards so nobody can change them. Your file is only ever handled in memory here, never written to our disk.
By ShinobiTools Team · Last updated: August 2026
A rental application, a tax form, a permission slip — a PDF that already has boxes built in for your name and your answers. Upload it and every field shows up as a normal form on this page: type your answers, tick what applies, pick from any dropdown. Nothing is guessed or drawn on top — you're filling in the file's own fields, so the result opens and prints exactly like the original, with your answers already in it.
A PDF form has two very different ways of looking filled-in-able. An AcroForm PDF carries real, interactive fields — text boxes, checkboxes, dropdowns — that any PDF reader can show as fillable controls, and that is exactly what this tool reads and writes. A scanned form, on the other hand, is just a picture of a form: the lines and boxes you see are pixels, with no field underneath them to type into.
This tool can only fill in the first kind. If your file turns out to be the second kind, it says so directly instead of failing quietly, and points to Sign PDF — which places typed or drawn text anywhere on the page, fields or not.
Filling in a field changes its current value, but the field itself stays editable — anyone who opens the result can change what you typed. Turning on "lock the filled values" runs the same flattening step as Flatten PDF: it draws each field's value straight onto the page as ordinary content and removes the interactive layer, so the answers become as permanent as any other text on the page.
Your PDF is processed entirely in memory on our own machine and handed back in the response — it is never written to our disk for this tool, and nothing is kept afterwards.
Need a signature on the form too, not just the typed fields? Sign PDF draws, uploads or types one onto the page. Already filled the fields in another program and just want the result locked? Flatten PDF does the same baking-in step this tool's lock option uses, on its own. Want to double-check that filling in the form didn't quietly change anything besides your own answers? Compare PDF lines the blank and filled versions up side by side. Started with a PDF that had no fillable fields at all? Create PDF Form drags text, checkbox and dropdown fields onto the page first, so there's something here to fill in.
Drop the PDF in. Every fillable field is listed with its current value — type into the text boxes, tick the checkboxes, pick from any dropdown — then press Fill in PDF and download the result.
You'll see a plain message saying so instead of an error. A scanned form is a picture with no underlying fields to fill — use Sign PDF to type or draw directly onto the page instead.
It bakes your answers into the page itself and removes the interactive fields, so nobody — including you — can open the file and change what you typed. Leave it off if an answer might still need editing later.
Text boxes, checkboxes and dropdown or list selections — the common AcroForm field types. Whatever your PDF's fields already are, they're shown with the matching kind of input.
No. This only fills in the form's own fields — the same as typing into it in a PDF reader. Neither this tool nor Sign PDF produces a certificate-based PAdES/eIDAS signature.
25 pages per file. There is no account, no watermark and no daily cap.