Tax forms, rental applications, onboarding packets, medical intake sheets: the files with the most personal detail are the ones you least want to push through a stranger's upload form. Here is how to fill one in locally.
PhantomEtch has a Form Fields panel that scans the PDF for its interactive fields (text boxes, checkboxes, radio buttons and dropdowns), lists each one by name, lets you fill them in, and writes the values back into the file. Apply & Flatten then bakes the values in so they can no longer be edited. The signature goes on afterwards with the Sign tool.
If your form is the second kind, a flat one, jump to the section on forms with no fields; it takes about as long as the interactive kind, just with more clicking.
Every "fill in this PDF" problem starts with one question that most guides skip: is this an interactive form or a picture of one? The answer decides how you will fill it, and you can find out in about ten seconds.
An interactive form (the specification calls the technology AcroForm) has real fields built into the file. In a normal PDF viewer, clicking a box puts a cursor in it, and Tab jumps to the next one. Government agencies, insurers, landlords with decent software, and HR platforms tend to produce these. A flat form looks identical on screen but has no fields at all. It might have been printed and scanned, exported from a design tool, or flattened by someone else to stop edits. Clicking a box does nothing.
PhantomEtch handles both, by different routes. For an interactive form, the Form Fields panel finds the fields and gives you proper inputs. For a flat form, you use the Text tool to type onto the page wherever a blank is, and the Draw, shape and stamp tools for ticks and crosses. The results look similar on the page; the difference is that the first route fills the actual fields, so anyone who opens the file in another viewer sees real, selectable form values, while the second route leaves ordinary text boxes laid on top.
To test which kind you have, open the file in the editor and open the Tools menu, choose Forms, then press Scan for Form Fields. If the panel lists names and types, you have an interactive form. If it says no AcroForm fields were found, you have a flat one, and the panel adds a reminder that the Text tool is still available.
Most PDFs you edit are documents that are merely private. Forms are documents that are personal: dates of birth, tax identifiers, bank details, previous addresses, the names of your dependants. Upload-first form tools receive all of that in a single file, and many ask for an email address on top.
In the PhantomEtch workflow, the PDF is read by a library in your browser, the field values you type stay in the page until you press Apply, and the file that gets written is assembled in the same tab and downloaded straight to your disk. The Form Fields panel carries a one-line badge that says processing runs locally, and that matches the code we read: scanning loads the bytes already in memory, setting a value edits that in-memory copy, and the result replaces the document you are looking at. The bytes are not posted to a server.
Keep the exceptions in view. The editor loads its own code and fonts when you open it and sends anonymous usage events like any other site. An optional AI panel exists that sends extracted text away to be summarized; it is separate from forms, and it is a bad idea for anything with an ID number in it. Leave it closed.
One more privacy habit worth forming: the autosave feature keeps a working copy of your session in your browser's own storage so a crash does not lose your typing. On your own laptop that is a convenience. On a shared or library computer, finish the job, save the file, and clear that site's data before you leave.
Ctrl+O. Page through it using the thumbnails on the left to see how many pages the form runs to. Viewing is the free part.applicant_surname and others as Text14. Where a name is unhelpful, click through to the page and read the label beside the box.G or choose Sign, draw, type or upload a signature, click the page where it belongs, and drag it into position. Our sign a PDF walkthrough goes through the three signature styles.Ctrl+S. The download is your original filename plus _edited. Open it in a different viewer from the one you used to fill it, scroll every page, and confirm each value and the signature are there.The order matters in one place: flatten before you sign if you want the answers locked underneath the signature, and fill before you flatten. Signing last also means a typo in a field does not force you to redo the signature.
| Field type | What you see in the panel | What gets written | Watch out for |
|---|---|---|---|
| Text (TEXT) | A single-line input with the current value pre-filled | The string you typed, set as the field's text | Long answers can overflow a narrow box; check the page after applying |
| Checkbox (CHECK) | A "Checked" toggle | The box is checked or unchecked | Some forms use a checkbox for each option, others use radio buttons; follow what the panel lists |
| Radio group (RADIO) | One radio button per option | The selected option | Only one option per group; the option labels are the form's internal values |
| Dropdown (SELECT) | A list with the form's options | The selected option | You can only choose from the options the form defines |
If the form has fields of a kind the panel does not recognise, it falls back to a plain text input, which is usually enough to see what the field expects. And because the panel lists every field in one place, it doubles as a checklist: you can tell at a glance whether you have skipped one, which a visual scroll through three pages of tiny boxes does not guarantee.
If the scan comes back empty, you have not hit a dead end. You have a different, slightly slower job.
W) is a good starting point for a portrait page.T), set a font size that fits the line (12px or 14px suits most forms), click on the first blank, and type. Click away to finish, then move to the next blank.V) to nudge anything that landed slightly off, and the keyboard undo if you misplace one.The result is a perfectly good completed form for anything where a person will read it. It is not a form with live data inside, so a system that tries to read your answers automatically out of the fields will find nothing. If a portal asks you to upload a fillable PDF, check whether it wants fields populated or is just collecting a document. If a PDF is a scan, you can also run OCR first so the text becomes selectable; the browser-based approach is in our OCR guide.
Printing, handwriting and re-scanning a form that had fillable fields all along. Run the scan first; it costs ten seconds.
Flattening too early. Once flattened, the values are fixed, and going back means reopening the original file and re-entering everything. Use Apply Values while you are still checking, and flatten only on the final pass.
Trusting the preview font. The page preview shows your values in the form's own field styling. Open the saved file in a second viewer and compare, because some viewers render form fields differently from others, and a flattened file is the most portable.
Skipping the final look. More on this below, but it is the single most useful thing to do before you email a completed form: open the exact file you are about to send.
Leaving required boxes blank because the label was ambiguous. The panel names are the form author's, not yours, so a field called Check Box7 tells you nothing. When in doubt, tick it in the panel, apply, and look at which box on the page changed.
Reusing a form you filled for someone else. Each Save writes a new file; keep one per recipient so personal details from one application do not end up in another.
Here is the plain version, because PDF tools are famous for hiding it. Viewing a PDF in PhantomEtch is free, and so is the tool in this guide. The free plan covers viewing, the basic tools (rotate, reorder, delete pages, merge, fill forms, add text, sign) and 2 clean, unwatermarked saves a day. Pro is a 30-day free trial, then $6.99/mo, with a card at checkout; it lifts the save limit and adds the rest of the tools (highlight, draw, shapes, stamps, images, watermark, extract pages, compress, OCR, redaction, compare, version history). You enter your email, a Stripe checkout link arrives by email, and that page asks for a card before the 30 days begin, so you are choosing to start a subscription; the account bar has a Manage link that opens the Stripe billing portal where you can cancel. We are not going to call that "free" and then tuck the card step into a footnote.
Forms are the most common reason people try a PDF editor once, finish the job, and never open it again. If that is you, the clean path is: open the form to confirm it displays correctly, fill and sign it, and save: form filling and signing are on the free plan, and that save is one of your 2 clean ones for the day. Forms are the free path here; the trial only matters if you need more than 2 saves a day or one of the Pro tools.
About the saved file: Save writes a new _edited.pdf next to your original. The Apply Values and Apply & Flatten steps change the document inside the editor; the file on disk only changes when you save. In the editor's code, Save on the free plan is metered (2 a day), and those saves are clean; after the second one, Save opens the upgrade prompt. A Pro save is clean too. What does carry our faint grey nullagency.io watermark is printing from the free plan, so print is not a way around the save limit. Open any file you plan to send and check it anyway. We would rather you hear that here than discover it in an email to your landlord.
PhantomEtch scans a PDF for its fillable fields, lets you complete them in a side panel, flattens the result and adds your signature, all in your browser tab. Viewing is free, and this tool is on the free plan with 2 clean saves a day. Pro is a 30-day free trial, then $6.99/mo, with a card at checkout, and lifts the save limit; printing from the free plan carries our mark, so save a file instead. Open the result before you send it.
Open PhantomEtch See how it comparesAdd text, highlights, drawings and notes in the browser
Draw, type or upload a signature and place it
Shrink a file before you email it
Make a scanned PDF searchable and copyable
Copy the words out of a PDF without retyping them
Black out personal details before you share a file
Disclosure: PhantomEtch is built by Null Agency, the publisher of this site, so we are not a neutral party about our own product. Everything above describes what the editor does today, including the parts that cost money or leave a mark on a saved file. We name other PDF tools only by category, and we quote no prices for them; check each vendor for current terms.