How Kalyvor keeps your files private
Encryption in transit, immediate deletion and what browser-side processing actually means.
4 min read
PDF securityFreeNew
Flatten PDF
Lock interactive form fields into place as static page content — nothing left to edit or fill in.
- ~2saverage
- 100 MBper file
- up to 20files per job
- Secure processing
- Auto-deleted when done
- No signup required
Drop your PDF here
or choose them from your device — nothing is uploaded until you press the button.
- Supported formats
- File limit
- Up to 20 files
- Size limit
- Up to 100 MB per file · 5 GB with Pro
- Retention
- Deleted when the job finishes
Paste⌘VBrowse⏎
Encrypted in transit · never used to train models
People also use
Tools that pair well with this one, or do the job from the other direction.
Why Kalyvor
Built for people who value their time
Every protect tool is fast, private and genuinely free — no dark patterns, no surprises.
Fast cloud processing
Jobs run on dedicated workers and finish in seconds — no queue, no spinner you can go make coffee to.
Auto file deletion
Everything you upload is erased the moment the job finishes. Nothing is written to long-term storage, so there is no retention period to wait out.
Works everywhere
Desktop, tablet or phone, any modern browser. Nothing to install, no plugins, no extensions.
Batch processing
Drop in a folder's worth of files and run the whole set through one tool in a single pass.
Privacy first
Encrypted in transit, never used to train models, never sold. Many tools never send the file at all.
No installation
Open a tab and go. No account needed to start, no download, no licence key to hunt for.
How it works
Flatten PDF in three steps
No account, no installation, no manual. It takes about as long to do as it does to read.
- 01
Add your files
Drag them onto the page, browse from your device, or paste straight from the clipboard.
- 02
Choose your settings
Adjust the options to taste — or leave the defaults, which are tuned for the common case.
- 03
Download the result
Your file is ready in seconds. We delete it from our servers the moment the job finishes, automatically.
Questions
Frequently asked questions
Everything worth knowing before you run your first Flatten PDF job. Still stuck? Talk to support.
Helpful articles
Guides and walkthroughs for getting more out of Flatten PDF.
Batch processing: run 100 files at once
A practical walkthrough of queueing large jobs without babysitting the tab.
6 min read
Choosing the right tool for the job
A short decision guide for when two tools look like they do the same thing.
5 min read
Getting started with Kalyvor
From first upload to finished download in under a minute — the whole flow.
3 min read
Explore more PDF tools
Search 153 productivity tools and get the whole job done in one tab — no installs, no account, no upsell at the finish line.
- ~2s average
- Secure processing
- No sign-up
- Free to start