Flatten PDF Free - Flatten Forms, Annotations and Batch PDFs Online
Convert PDF form fields, annotations, and hyperlinks into permanent static content. Batch process multiple files, choose Standard or full-page Image mode with custom DPI. Free, private & 100% browser-based - nothing uploaded.
Convert interactive PDF forms, annotations, and hyperlinks into permanent, static content. Choose Standard flatten or tamper-proof Image mode with adjustable DPI. Batch process multiple PDFs and download all at once.
Flatten Mode
Flatten Options
What is Flatten PDF?
PDF flattening converts all interactive elements - text field inputs, checkboxes, radio buttons, dropdown selections, freehand annotations, highlights, and clickable hyperlinks - into static, painted content on the page. The result is a clean PDF with no interactive layers that looks identical in every viewer and cannot be edited, filled in, or tampered with.
Our free PDF Flattener offers two distinct modes. Standard Flatten uses pdf-lib to merge form data and annotations directly into page content streams, preserving full text quality and original resolution. Image Flatten (rasterize mode) converts every page to a JPEG image using PDF.js and re-embeds it - making text uncopyable and providing the highest level of tamper-proofing for sensitive documents. For rasterize mode, choose from four output DPI levels (75, 100, 150, 220) to balance file size against print quality.
The tool supports batch processing - upload multiple PDFs at once, review them in the file queue, then flatten all in a single click. Single files download as .pdf; multiple files are packaged into a .zip automatically. Each file in the queue shows individual progress status so you always know what's happening.
Within Standard mode you have granular control: independently toggle flattening of form fields, annotations, and hyperlink removal. Password-protected PDFs are supported - the tool will prompt for the password on the fly if needed.
Since all processing runs entirely in your browser, documents containing sensitive personal, financial, or legal information are never transmitted to any server. Your files stay on your device from start to finish.
Powerful Features
Everything you need in one amazing tool
Batch Processing
Upload and flatten multiple PDFs at once. Each file shows its own progress status and all results download together as a ZIP.
Standard Flatten
Merges form fields, annotations, and hyperlinks into static page content using pdf-lib. Full quality preserved - no rasterization.
Image / Rasterize Mode
Converts every page to a JPEG image via PDF.js. Text cannot be copied or extracted - ideal for maximum tamper-proofing.
Custom DPI (75-220)
In Image mode, choose 75 dpi (smallest), 100 dpi (balanced), 150 dpi (sharing), or 220 dpi (print quality).
Remove Hyperlinks
Strips all clickable URL and internal navigation links from the document independently of other flatten options.
Private & Browser-Based
All flattening runs locally in your browser with pdf-lib and PDF.js. No files are ever uploaded to a server.
How It Works
Get started in 4 easy steps
Upload Your PDFs
Drop one or more PDF files onto the upload zone or click to browse. All files appear in the batch queue.
Choose Flatten Mode
Select Standard (preserves quality) or Image mode (rasterizes pages). In Image mode, pick your output DPI.
Configure Options
In Standard mode, toggle form fields, annotations, and hyperlink removal independently to suit your needs.
Flatten & Download
Click Flatten & Download. Single files save as .pdf; multiple files are bundled into a .zip automatically.
Why Choose Our Flatten PDF?
Stand out from the competition
Universal Consistency
Flattened PDFs render identically in all viewers - Adobe Reader, Chrome, macOS Preview, mobile apps.
Tamper-Proof Output
Once flattened, field values cannot be changed. Submitted data is permanently embedded in the page.
Private Processing
Filled forms containing personal data are never uploaded. Processing is completely local in your browser.
Archive Ready
Flattened PDFs are the correct format for long-term archival - no dependency on interactive layers.
Print Perfect
Printers render flattened PDFs correctly every time, without form field rendering issues.
Free, No Account
Flatten unlimited PDFs for free with no registration or subscription required.
Perfect For
See how others are using this tool
Completed Tax Forms
Flatten filled tax return PDFs before submitting or archiving to lock in the values permanently.
Job Applications
Flatten completed application forms before emailing to prevent accidental or intentional modification.
Document Archival
Flatten all interactive elements for compliant long-term PDF/A archival storage.
Print Preparation
Flatten before printing to ensure form fields are fully visible and render correctly on paper.
Digital Certificates
Flatten annotated certificates and signed agreements to preserve their final state permanently.
Email Distribution
Send flattened PDFs to ensure every recipient sees exactly the completed, uneditable document.
Frequently Asked Questions
Everything you need to know about Flatten PDF
Standard flatten uses pdf-lib to merge interactive elements into page content streams - text remains selectable and quality is unchanged. Image mode converts every page to a JPEG via PDF.js, making text uncopyable. Use Image mode for maximum tamper-proofing; use Standard for quality-preserving archival.
Yes. Drop multiple PDF files onto the upload zone or use the "Add more" button to build a queue. All files are processed sequentially and - when there are multiple files - downloaded together as a single ZIP archive.
Both achieve a similar result, but flattening is more precise: it renders interactive elements into the exact same content layer without affecting page size, resolution, fonts, or other document properties.
No. Flattening is a permanent, one-way operation. The interactive fields become static content. Always keep a copy of your original before flattening.
Standard mode may slightly increase file size as field content is drawn into page content streams. Image mode will generally increase file size more, depending on the DPI chosen. Use our Compress PDF tool afterwards if needed.
Yes, in Standard mode. If a PDF is password-protected, the tool will prompt you to enter the password before processing. Note: password-protected PDFs cannot be flattened in Image mode - use Standard mode or unlock the PDF first.
No. All flattening is done locally in your browser using pdf-lib and PDF.js. Nothing is ever transmitted to any server.
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