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PDF forms

Fill in any interactive PDF form and (optionally) lock the values in so they can't be edited again.

  • Encrypted in transit (TLS 1.3)
  • Files auto-deleted in 60 minutes
  • No signup required

Run PDF forms

Accepted: PDF Auto-deleted within 60 minutes

About PDF forms

PDF Forms is for those interactive PDFs you get from government agencies, banks and HR portals — the ones with empty boxes you can type into. Our endpoint lets you supply field values via JSON and ship a filled-in PDF.

Tick "Lock the values in" (flatten) to bake the field values into the page so the recipient can't accidentally edit them. Leave it off to keep the form editable.

How PDF forms works

Three steps. Done in seconds.

  1. 1

    Upload the fillable PDF

    Any PDF with interactive AcroForm fields.

  2. 2

    Provide field values

    Use the Advanced JSON: ``{"values":{"FirstName":"Ada","Email":"[email protected]"}, "flatten":true}``.

  3. 3

    Download the filled PDF

    Values are written into the form fields and (if you ticked the box) flattened so they're permanent.

Why PDF forms on Pixenith

Built for serious work. Free for everyday use.

Privacy first

Encrypted in transit, processed in isolated workers, deleted within 60 minutes.

Lightning fast

Most jobs finish in under 5 seconds. Heavy ones run on dedicated worker pools.

Production engine

Powered by pikepdf, Ghostscript, Tesseract OCR, ONNX models — the same tech the pros use.

Free, no signup

Generous daily limits on the free plan. Upgrade only if you need bigger files.

Related PDF tools

Often used alongside PDF forms.

Browse all tools →

PDF forms — frequently asked questions

Everything you need to know.

How do I know the form field names?

Open the PDF in Adobe Acrobat (Prepare Form mode) or any tool that lists AcroForm fields — you'll see the exact field name for every box.

What's the difference between filled and flattened?

Filled = values appear in the editable form fields (the recipient can still change them). Flattened = values are baked into the page (the form is locked).

Can I fill checkboxes and dropdowns?

Yes. For checkboxes, supply the field's "on" value (often "Yes" or "On"). For dropdowns, supply one of the choice values defined in the PDF.

What if the PDF has no fillable fields?

We'll tell you with a clear error message. Use our Edit PDF tool to overlay text on a static PDF instead.

Will the recipient see I filled the form?

Only if you flatten — otherwise the form metadata records the field changes. Most viewers don't display this.