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Flatten PDF
Flatten PDFs online to combine layers, form fields, annotations, and other elements into one fixed document. Work securely in your browser with no software download or sign-up required.
- Flatten PDFs on Mac, Windows, or any device
- Free to use without download or installation
- Files protected with TLS encryption
Flatten PDFs for Security, Sharing, and Consistent Viewing
Combine layered PDF content into one fixed document before you submit or share it. Flattening helps limit further edits and can reduce problems caused by form fields, annotations, and other interactive elements.
Prevent Data Tampering
Flatten text, images, annotations, and form fields into the document so they no longer remain separately interactive. This helps limit changes after you share the PDF.
Prepare PDFs for More Reliable Printing
Fix form fields, annotations, and layered graphics in place before printing. This can help prevent missing elements or unexpected layout changes in the printed document.
Accessible Documents on Any System
Some systems struggle with multi-layered PDFs. Flattening eliminates compatibility issues, so your document displays correctly on any platform or device.
How To Flatten PDFs for Free
- Import or drag & drop your file to our Flatten PDF tool.
- Click “Flatten PDF” to merge the document’s layers and interactive elements.
- Download the flattened PDF or share it when processing is complete.
Flatten Any PDF for Accuracy & Integrity
Make Large PDFs Easier to Share
Multi-layered PDFs take up more storage space. Flattening consolidates layers into a smaller file that's easier to share and store. Need even smaller files? Use our Compress PDF tool.
Flatten PDFs Online on Any Device
Our Flatten PDF tool can be used from any device right through your browser. Try it out—just drag your PDF into the box above, no matter what screen you're using.
Edit Before You Flatten PDFs
Need to annotate a PDF before you permanently flatten it? Start with our PDF Editor to get just what you need, then flatten your PDF to preserve your document integrity.
Increase Your PDF Security
Multiple layers mean multiple points of vulnerability. Flattening locks all content into place, protecting your document from unauthorized changes.
All Platforms Love Flattened PDFs
Flattened PDFs work everywhere. By merging layers into one, you eliminate the compatibility issues that complex documents often cause across different systems.
Stay Private With Secure Encryption
Smallpdf uses TLS encryption while your file is transferred. Uploaded files are automatically deleted after one hour unless you save them to your Smallpdf account.
Flatten PDF FAQs
What does it mean to flatten a PDF?
Flattening a PDF fixes elements such as form fields, annotations, text, and images into the document. These elements stop behaving as separate interactive layers, which can make the file easier to print and share consistently.
Why is it important to flatten PDF layers?
Flattening fixes form fields, annotations, and other layered elements in place, which helps limit accidental changes after the file is shared. It can also reduce display or printing problems when different PDF viewers handle interactive content differently.
What happens when I flatten a PDF?
Form fields, annotations, and other interactive elements become fixed parts of the document. Some links or form functions may stop working, so save an editable copy before flattening.
Can I undo a flattened PDF to restore the layers?
In general, no. Once a PDF has been flattened, the process can’t be easily reversed. So make sure you save a copy of your original file before flattening, in case you need to make edits later. Of course, you can also use a separate tool like our free PDF Editor to recreate annotations, images, links, and more if you don't have an unflattened copy of your doc.
How can I flatten PDFs online for free?
Upload your PDF to the Flatten PDF tool, complete the flattening process, and download the finished file. You can start for free without installing software or creating an account, although usage limits apply.