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PDF & documents

PDF & documents — processed in your browser

Three tools for paperwork: Sign puts your signature into a PDF, Fill fills in PDF forms, Bill shows XRechnung and ZUGFeRD e-invoices in readable form. All three work only in your browser; your documents are not uploaded. They are free and need no account.

The tools

Free

Birdsuite Sign

Sign PDFs without uploading them: draw or type, place, download. Simple electronic signature.

  • No upload
  • Draw or type
  • Free, no account

No advanced or qualified electronic signature (AdES/QES) — not enough for documents that legally need written form.

No upload No account

Alternative to Smallpdf, PDF24, Adobe Fill & Sign

More about Sign Open Sign

Free

Birdsuite Fill

Fill PDF forms right in the document — no printer, no upload, optionally lock the fields when saving.

  • No upload
  • No Adobe needed
  • Lock the fields (optional)

Only PDFs with real form fields: Fill cannot fill in scanned or "flat" PDFs without fields.

No upload No account

Alternative to Adobe Reader, PDF24

More about Fill Open Fill

Free

Birdsuite Bill

Read e-invoices: open XRechnung and ZUGFeRD in your browser, check the totals and print — no upload, no software subscription.

  • XRechnung in UBL and CII
  • ZUGFeRD and Factur-X
  • Totals check

No binding check: Bill is a viewer with a totals check, not a validator for the XRechnung or EN 16931 rules.

No upload No account

Alternative to ELSTER viewer, sevdesk viewer

More about Bill Open Bill

Which tool for which job?

Better together

  1. Fill
  2. Sign
  3. Transfer

Paperwork: fill in, sign, send

Fill in the form with Fill, add your signature in Sign and send the finished PDF with Transfer. Until you send it, the document stays on your device.

Data and privacy

All three work only in your browser

Contracts, applications and invoices stay on your device; our server never sees them. A finished PDF only leaves your device when you choose to send it with Transfer.

How we process data, tool by tool

Frequently asked questions

Are my PDFs uploaded?
No. Sign, Fill and Bill open and edit your files in your browser. You can check it in the network tab of your browser’s developer tools: your PDF never shows up as an upload.
Is a signature made with Sign legally valid?
Sign creates a simple electronic signature, which is enough for many documents without form requirements, such as quotes or confirmations. Where German law requires written form (§ 126 BGB), you need a handwritten or a qualified electronic signature, and Sign does not create one. This is not legal advice.
My PDF has no form fields. What now?
Use Sign. Fill fills in existing form fields and points you to Sign when a PDF has none; in Sign you place your signature anywhere on the page.
Does Bill check whether an e-invoice is valid?
No, Bill is a viewer. It makes XRechnung and ZUGFeRD readable and checks the totals, but it is not a binding validation. Always archive the original file, not the printout.
What does it cost?
Nothing. Sign, Fill and Bill have no paid plan, show no ads and need no account.

More categories

Communicate & organize

Meet · Book · Note · Talk

Send & share

Transfer · Seal · Scan

Image & video

Clip · Trim · Shrink