everyday mac tools

Fill in a PDF that has no form fields on a Mac

· 7 min read

If you click on a blank line in a PDF form and no cursor appears, the form has no fields: it is a scan, or a document exported flat with lines drawn where the answers go. On a Mac, Preview fills it with text boxes from the Markup toolbar, one per answer, and the Sign button adds a signature. Work on a copy, and if the file is going to an upload portal, print it to a new PDF so your answers become part of the page.

If the form does have fields (you can click into a box and type, and Tab moves you on), you want Fill in a PDF form on a Mac and flatten it instead. This post is about the forms that refuse.

Check the form, then make a copy

Two kinds of flat form behave differently later, so it is worth ten seconds to tell them apart. Open the PDF in Preview and zoom right in on a printed label with Command-Plus.

  • The label stays crisp at any zoom. The form was exported from a word processor or design app without fields. The labels are real text, the file is usually modest in size, and your answers will sit cleanly on top.
  • The label turns soft or blocky as you zoom. It is a scan: a picture of a paper form. Lines may be slightly crooked and the page slightly grey, which affects how you line text up, and the file is usually larger.

Before going further, look on the issuer’s website for the same form. A flat copy is often a scan of a form that also exists as a fillable PDF, forwarded around an office until the fields were lost.

Then make a copy before you type anything. Preview saves edits into the open file as you go, so if you start on the original, the blank form is overwritten. Choose File, Duplicate, save the duplicate with a name such as Parking permit application - filled.pdf, and close the original.

In the copy, recent versions of macOS may show a banner with an AutoFill Form button. It tries to find the lines and boxes on the page and put a text box on each. Accept the help where it guesses right; delete its boxes and place your own where it does not.

Put an answer on each line

  1. Choose View, Show Markup Toolbar, or click the pen-tip button in the toolbar.
  2. Click Text, the button with a T in a box. A box containing the word Text appears in the middle of the page. The same tool is under Tools, Annotate, Text.
  3. Type your answer. It replaces the placeholder.
  4. Drag the box onto its line.
  5. Click Text Style (the button marked Aa) and set the font, size and color. Black is the safe choice; some forms ask for black ink, and dark blue on a grey scan reads badly.

Getting the first box right is the slow part. After that, select it, copy it (Command-C) and paste it (Command-V) for the next answer, then change the words. The copy keeps your font and size, so every answer matches.

Recent versions also have a Form Filling toolbar with its own button (its look varies by version). With it showing, Preview’s hint says you can double-click anywhere on the PDF to add a text box. That saves dragging every box in from the middle of the page.

Lining text up so it looks deliberate

  • Zoom in while placing. Command-Plus a couple of times, so a small drag is a small movement.
  • Sit the text just above the line, not on it. Letters touching a printed line are hard to read once the file has been printed or scanned again by the recipient.
  • Match the form’s own type size. Pick a size whose capitals are no taller than the gap above the line. If an answer is too long, shrink that one box rather than letting it run into the margin.
  • Rows of boxes for single characters. Dates and reference numbers printed as a row of small squares are easiest with one text box per character. A monospaced font such as Menlo with spaces between characters can cover a whole row, but rarely lines up exactly on a scan.
  • Checkboxes. A text box containing a capital X, sized to fit inside the square.
  • Answers that need several lines. Press Return inside the box for a new line, then nudge the box so each line lands on a printed one.

Sign and date it

Click Sign on the Markup toolbar (in the menus it is Tools, Annotate, Signature). Choose a saved signature, or create one with the trackpad, the camera or a nearby iPhone. Drag it onto the signature line and resize it from a corner. Put the date beside it with another text box.

If the form asks for initials on every page, create a second signature that is just your initials; Preview keeps both. Sign a PDF on a Mac covers creating signatures and what kind of signature this actually is.

Save it, then decide whether to flatten

Command-S saves your answers into the copy. Every text box and the signature are now annotations: separate objects sitting on top of the page. Most PDF readers draw them, anyone who opens the file can move or edit them, and some systems that process uploads ignore them entirely.

If the form is going to a person who will read it, the saved file is usually fine. If it is going into an upload portal, or you want the answers fixed in place, print it to a new PDF:

  1. Choose File, Print.
  2. Open the PDF menu at the bottom of the print dialog and choose Save as PDF.
  3. Give it a new name and save.

In most cases this draws your text boxes and signature into the page itself. Check rather than assume: open the new file and click one of your answers. If a box selects and can be dragged, it is still an annotation and the print did not flatten it.

Keep the unflattened copy. A typo spotted later is a quick fix there, then another print.

When an upload portal rejects it

Portals fail in a few recognizable ways.

The preview after upload shows a blank form. The portal draws only the page and ignores annotations. Upload the flattened copy from the previous section.

It says the file contains comments, annotations or markup, or that it has been modified. Same fix: flatten it. If the flattened file is still refused, the portal may be checking the PDF’s structure rather than what it looks like. The bluntest way through is paper: print the filled form, sign it by hand if you prefer, and scan it back in with Preview’s File, Import from Scanner, or photograph it. Turning phone photos of a document into one readable PDF covers making that look like a proper scan.

It says the file is too large. A scan can come out of the print dialog larger than it went in. Compress the flattened copy (compress a PDF on a Mac without wrecking the scans covers how), then check every answer is still readable at normal zoom.

If none of that works, ask the issuer which file types they accept. Some will take the form by email when the portal will not.

Where a PDF app helps

For one form, Preview and the print dialog are the whole job. If you fill and send forms regularly, Basalt puts the steps around them in one window: a Forms tool that fills and locks forms, a Sign tool, Compress for portals with size limits, and Inspect, which shows what a PDF still carries before you upload it. Every tool writes a new file, so the blank original is never touched, and nothing is uploaded. For a flat form, the text boxes in Preview are still where the answers go.

Questions

Can I type straight onto a scanned form without text boxes? No. A scan is a picture, so there is nothing to type into. Text boxes, placed by you or by AutoFill, are how text gets onto it.

Will the recipient be able to change my answers? In the unflattened file, easily. After printing to PDF the answers are part of the page, which stops accidental changes, but a determined person with a PDF editor can still alter a page. Keep a copy of exactly what you sent.

Can I fill a flat form on my iPhone instead? Yes. Open the PDF in the Files app, tap the Markup button, and add text from the plus button. The same flattening question applies when you send it.