# Flatten PDF: Arthize vs PDF24

_Updated July 2026 · Arthize · https://arthize.com/vs/pdf24/flatten-pdf_

To flatten a PDF, Arthize offers a free, private flatten pdf with no watermark — a focused alternative to PDF24. 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 PDF24

PDF24 is a free PDF toolset with web and desktop apps. PDF24 is a free, ad-supported toolkit available in the browser and as a Windows desktop app.

**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.

- Files are processed inside your private Arthize workspace and deleted after the job — never sold or used to train models.
- 50+ tools live in one workspace, so you don't jump between single-purpose pages.
- A modern, unified web workspace rather than separate utilities.
- Transparent pricing: free forever, Pro from $6/mo or $48/yr, and a one-time $149 lifetime option.

## 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 PDF24 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. PDF24 is a solid free option, particularly its Windows desktop app for offline use.

### 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.