# Flatten PDF: Arthize vs PDFtk

_Updated July 2026 · Arthize · https://arthize.com/vs/pdftk/flatten-pdf_

To flatten a PDF, Arthize offers a free, private flatten pdf with no watermark — a focused alternative to PDFtk. Flattening a PDF merges form fields, annotations and layers into the page, so nobody can change filled-in values and the file renders everywhere.

## Arthize's flatten pdf vs PDFtk

PDFtk is a command-line PDF toolkit. PDFtk is a free command-line tool for scripted PDF operations.

**Arthize's approach:** Flattening a PDF merges form fields, annotations and layers into the page, so nobody can change filled-in values and the file renders everywhere.

- A visual workspace instead of memorising command-line flags.
- 50+ tools live in one workspace, so you don't jump between single-purpose pages.
- Files are processed inside your private Arthize workspace and deleted after the job — never sold or used to train models.
- Handles conversion, OCR, signing and editing that PDFtk doesn't.

## How to flatten a PDF with Arthize

Flattening bakes form fields and annotations into the page so they can't be changed.

It fixes forms that display differently in different viewers.

A flattened PDF is the safe way to share a completed form.

## How to flatten a PDF with Arthize

1. **Open the flatten tool** — Sign in and open the Flatten tool.
2. **Add your PDF** — Upload a form or annotated document.
3. **Flatten** — Arthize bakes fields and annotations into the page content.
4. **Download** — Get a flattened, tamper-resistant PDF.

## FAQ

### Is Arthize a good PDFtk alternative to flatten a PDF?

Yes. Flattening a PDF merges form fields, annotations and layers into the page, so nobody can change filled-in values and the file renders everywhere. Arthize does it free with no watermark and deletes the file after the job. PDFtk is excellent for developers automating simple, repeatable PDF tasks from scripts.

### How do I flatten a PDF form?

Flattening a PDF merges form fields, annotations and layers into the page, so nobody can change filled-in values and the file renders everywhere. On Arthize it's free with no watermark and processed privately.

### Why do my filled form fields disappear in some viewers?

Flattening a PDF merges form fields, annotations and layers into the page, so nobody can change filled-in values and the file renders everywhere. On Arthize it's free with no watermark and processed privately.