Paperwork
Fill in the form, sign it, send it — no printer, no scanner.
Birdsuite Fill
Fill in PDF forms — right in the document
Fill PDF forms right in the document — no printer, no upload, optionally lock the fields when saving.
- No upload
- No Adobe
- Free
Alternative to Adobe Reader, PDF24
Free
Free: what Birdsuite Fill does without a subscription
Fill in as many PDF forms as you like
Included for free
- Text, checkboxes, radio buttons and choice lists
- Optionally lock the fields when saving
- Download the filled PDF or send it via Transfer
- No ads, no upload
Free, with no catch
- No account Open the tool and start. No sign-up, no email address, no password.
- No ads No banners, no pop-ups, no sponsored results — in the free plan too.
- No tracking No tracking cookies, no profiles. We only count visits, cookieless and with shortened IP addresses.
- Stays on your device Your files are processed in your browser and never uploaded.
- No payment details No credit card and no trial: the free plan stays free for as long as you use it.
There is no paid plan: everything Birdsuite Fill does is free, with no trial that runs out.
Open Fill for freeBirdsuite Fill is a free web tool by Berlin Bird Studios for filling in PDF forms right in your browser: text fields, checkboxes, radio buttons and choice lists. The PDF is never uploaded, and you need neither an account nor Adobe Reader. Optionally, Fill locks the fields when saving, making your entries a fixed part of the page.
The problem
An application or registration form arrives as a PDF, and your browser only displays it or does not save the entries properly. Printing, filling in by hand and scanning again is tedious, and online converters want to upload the form with your personal data first.
The solution
Birdsuite Fill finds the form fields in the PDF and places input fields exactly on top of them. You type, tick and choose, all in your browser, and download the filled PDF.
How it works
-
1
Open the form
Drop the PDF form onto the page or pick it. Fill shows how many form fields it found.
-
2
Fill it in right in the document
Type into text fields, tick checkboxes and pick options — exactly where they sit in the form.
-
3
Save
Download the filled PDF, optionally with locked fields, or send it on via Transfer.
Features
No upload
pdf.js reads the form fields and pdf-lib writes your entries back — both run in your browser. The form stays on your device.
No Adobe needed
Nothing to install, no account to create: Fill runs in any current browser.
Lock the fields (optional)
Tick one box and the fields become a fixed part of the page when saving, so they can no longer be changed as a form.
Right in the document
The input fields sit exactly on top of the form's fields, so you see at once what goes where.
All common field types
Single- and multi-line text fields, checkboxes, radio buttons, and dropdown and list boxes.
Existing entries are kept
Fill picks up values that are already filled in and leaves read-only fields alone, so you can keep working on a saved form later.
Send via Transfer
If you like, the filled PDF goes straight to Birdsuite Transfer and from there to your recipients as a link.
No fields? On to Sign
If a PDF has no form fields and only needs your signature, Fill points you to Birdsuite Sign.
Data and privacy
- Processing
- Entirely in your browser. pdf.js renders the form and reads its fields, pdf-lib writes your entries into it; neither the document nor your entries are sent to our server.
- Storage
- Nothing. Fill stores neither the PDF nor your entries, not even in your browser — close the tab and it is gone. We only count anonymously how many forms are filled per day. Only if you choose "Send via Transfer" does Birdsuite Transfer upload the finished PDF to servers in the EU (Germany and France).
- Processors
- None. Your form reaches no service provider; only the page itself is delivered by our host, Host Europe in Strasbourg, France.
Test it yourself: Test it yourself: open your browser's developer tools (Network tab) and fill in a form. Your document never shows up there as an upload — only the parts of the Fill app are loaded.
Pricing
Free – no subscription
Fill in as many PDF forms as you like
- Text, checkboxes, radio buttons and choice lists
- Optionally lock the fields when saving
- Download the filled PDF or send it via Transfer
- No ads, no upload
Fill has no paid plan. There is no limit from our side; very large files only depend on your device.
What Fill can’t do
- Only PDFs with real form fields: Fill cannot fill in scanned or "flat" PDFs without fields.
- No free text: Fill only writes into existing fields, not anywhere on the page.
- No digital signature fields — for your signature there is Birdsuite Sign.
- Fill cannot open password-protected (encrypted) PDFs.
- No drafts: Fill remembers nothing. Download the PDF before you close the tab.
Birdsuite Fill compared
| Criterion | Birdsuite Fill | Typical online PDF tools |
|---|---|---|
| Form is uploaded | No, it stays in your browser | Usually yes |
| Account needed | No | Sometimes |
| Ads | None | Some are ad-funded |
| Installation needed | No | Yes for desktop readers |
| Lock fields when saving | Yes, optional | Sometimes |
Last updated: 21 October 2026
Who is it for?
Families
Fill in applications and forms that come as fillable PDFs on your computer instead of printing them.
Clubs
Fill in membership applications, registration sheets and expense forms and pass them on via Transfer.
Freelancers and offices
Fill in supplier forms, questionnaires and order forms — personal data stays on your own device.
Better together
Birdsuite Transfer
Send large files without an account — free up to 5 GB, up to 1 TB per transfer with Max. Stored in Germany, with download notifications.
Birdsuite Sign
Sign PDFs without uploading them: draw or type, place, download. Simple electronic signature.
Birdsuite Bill
Read e-invoices: open XRechnung and ZUGFeRD in your browser, check the totals and print — no upload, no software subscription.
Frequently asked questions
- Is my form uploaded?
- No. Fill opens, fills and saves the PDF entirely in your browser. Our server only delivers the page and counts anonymously how often a form was filled — no content, no file name.
- Why can't I fill in a PDF?
- Usually the PDF has no real form fields. That is the case with scanned forms or forms saved as images, and with PDFs created without fields. Other reasons: the PDF is password-protected, or it is an XFA form (often showing "Please wait …") that many programs other than Adobe Reader cannot fill in. After opening, Fill shows how many fields it found.
- Are my entries kept when saving?
- Yes. Fill writes your entries into the PDF's form fields; you can open the file again later and keep editing, in Fill or any other PDF program. If you tick "Lock fields", the entries become a fixed part of the page and can no longer be changed as a form.
- Do I still need to sign an official form?
- Often yes, by hand. Check the form or the authority's website: only where electronic submission with a simple electronic signature is explicitly allowed can you sign with Birdsuite Sign. Otherwise print the filled form and sign it with a pen.
- Does it work without Adobe?
- Yes. Fill runs in your browser; you need neither Adobe Reader nor any other program or account.
- Does Fill cost anything?
- No. Fill is free, needs no account, shows no ads and has no paid plan. There is no limit from our side; very large PDFs only depend on your device.
Ready? Birdsuite Fill runs right in your browser.
Last updated: 21 October 2026