Flatten PDF
Flatten PDF files online for free. Turn fillable fields, checkboxes, dropdowns, comments, highlights, and drawings into fixed content that can no longer be changed.
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How to Flatten a PDF
Need to flatten a PDF form? ToolifyPDF lets you flatten PDF files online for free, right in your browser. Flattening turns the fillable fields of a form (text boxes, checkboxes, radio buttons, and dropdowns) into fixed content, so the answers stay exactly as they are and can no longer be changed. It's the best way to finalize a filled-in form before you send, print, or archive it. Flatten one PDF or up to 30 at once, with no software to install and no account needed.
Lock Filled-In Forms
Text boxes, checkboxes, radio buttons, and dropdowns become part of the page. The answers stay visible, but nobody can change them anymore.
Flatten Up to 30 PDF Files
Upload several PDF forms at once, up to 200 MB each, and download them all together in a ZIP file.
Looks the Same Everywhere
Flattened forms display and print the same in every PDF viewer, browser, and phone, even ones that don't handle fillable fields well.
How to Flatten a PDF
- Select Files: Click "Select Files" or drag and drop your PDF forms into the box.
- Flatten: Click "Flatten PDF" to turn the form fields into fixed content.
- Download: Click "Download" to save your flattened PDF. Several files are downloaded together in a ZIP file.
Flatten PDF on Windows, Mac, iPhone, and Android
ToolifyPDF works in any modern browser. You can flatten PDF files on Windows, Mac, Linux, iPhone, iPad, or Android without installing software. It works in Chrome, Safari, Firefox, and Edge.
Why Flatten PDF Files with ToolifyPDF?
Unlike desktop software like Adobe Acrobat that requires a paid subscription, ToolifyPDF lets you flatten PDF files online from any device, for free. Our flatten PDF tool is perfect for:
- Finalizing a filled-in application, tax form, or contract before sending it
- Making sure form answers print correctly at a print shop or on any printer
- Archiving completed forms so the answers can't be changed later
- Sending forms to people whose PDF viewer doesn't show fillable fields
- Preparing filled-in forms before merging them into one PDF
FAQ
How do I flatten a PDF?
Upload your PDF to ToolifyPDF, click "Flatten PDF", and then click "Download". The form fields in your file are turned into fixed content in a few seconds, with nothing to install.
What does it mean to flatten a PDF?
Flattening a PDF means turning its interactive form fields into ordinary page content. A filled-in text box, a ticked checkbox, or a selected dropdown option stays visible exactly as it is, but it is no longer a field, so it can't be edited or filled in again. Comments, highlights, sticky notes, and drawings are flattened the same way: they stay visible but can no longer be moved, edited, or deleted.
Which parts of my PDF are flattened?
ToolifyPDF flattens everything that can still be edited on top of the page: form fields (text boxes, checkboxes, radio buttons, and dropdown lists) and annotations (comments, sticky notes, highlights, stamps, and drawings). Links stay clickable. A sticky note keeps its icon on the page, but its pop-up text is no longer available.
Should I flatten a PDF before printing?
If your PDF is a filled-in form, yes, it's a good idea. Some printers, print services, and older PDF viewers don't show the content of form fields correctly. Flattening makes your answers part of the page, so they print exactly as you see them.
Why should I flatten a filled-in form before sending it?
A fillable form can still be changed by anyone who opens it. Flattening locks the answers, so the person receiving it sees the final version. It also avoids blank fields when the file is opened in an app that doesn't support forms.
Can I flatten a PDF online for free?
Yes. You can flatten PDF files online for free, with no account and no watermark. Each file can be up to 200 MB, and you can flatten up to 30 files at once.
Can I unflatten a PDF afterwards?
No. Once a form is flattened, its fields are gone and the answers are part of the page. Keep a copy of your original fillable PDF if you might need to change the answers later.
Can I flatten a password-protected PDF?
Yes. You'll be asked for the password when you add the file. The flattened PDF you download is not password-protected, so if you need protection, add a new password with Protect PDF.
Will flattening change the look or quality of my PDF?
No. The pages, text, and images stay the same. Only form fields and annotations change: they are drawn on the page as fixed content instead of being editable.
Can I flatten a PDF on Mac, Windows, or iPhone?
Yes. Open ToolifyPDF in Safari, Chrome, Edge, or any modern browser on your Mac, Windows PC, iPhone, or Android phone, upload your PDF, and click "Flatten PDF". You don't need Adobe Acrobat or any other software.
Advanced Features
Beyond basic flattening, our tool offers several helpful features:
- All Field Types: Flattens text boxes, checkboxes, radio buttons, and dropdown lists.
- Annotations Too: Comments, highlights, stamps, and drawings are flattened into the page as well.
- Batch Flattening: Flatten up to 30 PDF files at once and download them in a ZIP file.
- Large Files: Each PDF can be up to 200 MB.
- Protected PDF Files: Enter the password once and flatten password-protected forms.
- Same Look: Pages, text, and images stay exactly as they were.
- Clear File Names: Each flattened file keeps its name with "_flattened" added.
💡 Pro Tip
Always keep a copy of your original fillable PDF before flattening. Once a form is flattened, the answers can't be edited again, so you would have to fill in the form from scratch to change anything.
Privacy & Security
We take your privacy seriously. All file uploads and processing happen over encrypted HTTPS connections. Your files are automatically deleted from our servers after one hour, and we never store or share your documents with third parties. You maintain complete control over your data at all times.
Ready to flatten your PDF?
Start flattening your PDF forms now. It's free, fast, and requires no registration.