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PDF to images

Why a PDF form stops being fillable after converting to JPG

By DeckleUpdated

A PDF form stops being fillable after you convert it to JPG or PNG and back to PDF, because the image holds only pixels. PDF to JPG turns each page, fields included, into a picture, and JPG to PDF places that picture on a new page. The boxes still look like boxes, but nothing in the new PDF knows they are fields. Keep the original PDF if anyone still needs to type into it.

PDF to JPG

Same physical page, more pixels

150 DPI

Letter: 1,275 × 1,650 pixels

300 DPI

Letter: 2,550 × 3,300 pixels

Double each dimension → four times the pixels

Example calculation · nominal sizes for an 8.5 × 11-inch page. Actual exports depend on page geometry and rounding.

What happens to a form in an image round trip

Step What the file contains
Original fillable PDF Text, drawings and form fields you can type into, tick and tab between
After PDF to JPG One picture per page; the fields are now coloured pixels
After JPG to PDF A new PDF with one picture per page, and no fields, text layer or links

The round trip also removes selectable text. You cannot search the new PDF or copy a line from it, because every word is part of an image. Any field calculations, drop-down lists, signature fields and buttons are gone too, along with the document's bookmarks and links. What changes when a PDF page becomes an image covers the full list.

Why people do it, and what to do instead

People usually take this route for one of three reasons. Each has a better option.

  • "The portal only accepts JPG." Export the filled pages as JPG and upload the images, but keep the fillable PDF for yourself. You do not need to turn the images back into a PDF.
  • "I want to lock the answers so they cannot be changed." An image does that, but it also makes the text unsearchable and the file larger. If you only need to stop casual edits, sending the PDF with a note works for most forms. If the recipient must not change it, ask them which format they accept.
  • "The form would not save my answers." Some forms are set up so that typed values are not saved in every viewer. Open the PDF in a different viewer, fill it again and save, then check the saved copy still shows your answers.

How to send a filled form as images

  1. Fill the form in your PDF viewer and save it.
  2. Reopen the saved file and check every answer is there.
  3. Open PDF to JPG and choose the saved PDF, or drop it onto the page.
  4. Choose Standard under Resolution and Balanced under JPEG quality.
  5. Choose Export images and download the JPGs.
  6. Open each image and check that every value you typed, ticked or selected is visible before you upload it.

If a value is missing from the image, do not upload it. Try saving the form from a different viewer, then export again.

If you already have the flattened copy

The image PDF cannot be turned back into a form. Go back to the original fillable PDF or ask the sender for a fresh copy. If neither exists, the image PDF can still be printed, filled by hand and scanned, or annotated in a viewer that lets you add text boxes on top of a page.

Example: a landlord sends a fillable tenancy application. You fill it, export it to JPG to "make it safe", and convert the JPGs back into a PDF with JPG to PDF. The landlord now wants you to correct your phone number. The new PDF has no fields to edit, so you must fill the original again. Keeping the original fillable PDF would have made the correction a ten-second change.

Tips

  • Never overwrite the fillable original. Deckle always creates new files, but rename your own exported copies clearly, such as application-filled-images.pdf.
  • Check values in the image, not the viewer. What a viewer shows on screen and what an export draws can differ.
  • Send the PDF when you can. A filled PDF is smaller, searchable and easy to correct.
  • Use Print resolution for small print. Fine terms and conditions need Print to stay readable in an image.

Frequently asked questions

Can I make an image of a form fillable again?

No. The image has no fields. Use the original fillable PDF or ask for a new copy.

Why can I not select text after converting JPG back to PDF?

Every word is part of a picture. The new PDF has no text layer.

Does PDF to JPG change my form?

No. Deckle creates new image files and leaves the PDF, its fields and your answers as they were.

Is an image a secure way to stop changes?

No. Images can be edited in any photo editor. It only stops someone typing into fields.

Related tools

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