Flatten PDF
Convert interactive PDF forms and annotations into static background elements. Lock in signatures and form data to prevent further editing.
Upload PDF File
About This Tool
Flattening is the process of merging interactive elements—like Form Fields, Digital Signatures, and Comments—into the visual "base layer" of the PDF. Once flattened, these elements are no longer interactive; they become part of the background image/text.
This is a critical step before finalizing a contract or submitting a form. It prevents recipients from accidentally or intentionally changing the data you’ve entered. It also ensures that your annotations (highlighter, shapes, or notes) appear exactly as intended across all different PDF viewers and devices.
Secure Local Flattening: By processing the file in your browser, your signatures and filled form data are never exposed to external servers during the merging process.
How to Use
Upload Your PDF
Upload the PDF with the forms or notes you want to lock.
Choose Layers
Select whether to flatten form fields, annotations, or both.
Flatten and Download
Click Flatten to render the elements static and download the result.
Use Cases
Finalize Forms
Ensure that nobody can change your submitted form data.
Lock Signatures
Make digital signatures a permanent, non-interactive part of the document.
Compatibility
Fix display issues where some PDF readers don't show comments or form data correctly.
Frequently Asked Questions
Can I "un-flatten" a PDF later?
No. Flattening is a one-way process. Once the interactive data is merged into the background, it cannot be turned back into an editable form. Always keep your original "live" version.
Will my text remain searchable?
In most cases, yes. Our tool flattens elements into the graphics layer but preserves the underlying text layer for searchability.
Does this reduce the file size?
Yes, often significantly. Removing the complex interactive code for form fields and signatures usually results in a much leaner file.