Is FormFlat free to use without a subscription?

Yes, FormFlat is 100% free with no accounts, no monthly paywalls, and no download watermarks.

Are my confidential files uploaded to any servers?

No. All PDF rendering, form filling, signature baking, and vector flattening happen strictly inside your browser using Web Workers and WebAssembly.

What is PDF flattening and why does it fix the Mobile Blank Bug?

Many mobile viewers (iOS Files, Android, Gmail previews) do not render interactive AcroForm fields properly. FormFlat bakes text and signatures directly into permanent vector content streams, ensuring universal rendering on every device.

Can I fill out a flat, non-interactive PDF that has no form fields?

Yes! Unlike Adobe Reader or Preview which lock non-interactive PDFs, FormFlat allows you to click anywhere on the page to place clean, crisp text and vector checkmarks.

Are my confidential documents uploaded to a cloud server?

Never. FormFlat runs 100% in your local browser using WebAssembly and Web Workers. Your tax returns, leases, and medical records never touch our servers.

Why do filled PDFs from other sites show up blank on iPhone and Android?

Standard converters leave interactive AcroForm widgets behind. Mobile PDF readers in Gmail, WhatsApp, and iOS Files do not render these widgets. FormFlat flattens annotations directly into the PDF vector stream, ensuring 100% visual fidelity everywhere.

Is there a limit on how many PDFs I can fill for free?

No limits, no trial counters, and no credit card requirements. FormFlat is genuinely free and unconstrained.

Fill PDF Forms Online Without Subscription or Cloud Uploads

The honest, private PDF form filler. Click anywhere on flat or interactive PDFs to type text, check boxes, stamp signatures, and export immutable vector PDFs that never fail on mobile.

Step-by-Step Guide

STEP 1

1. Select or Drop Your PDF

Drag your PDF form into the box above. It runs entirely inside your browser WebAssembly sandbox without uploading to any remote server.

STEP 2

2. Type & Fill Out Every Field

Click anywhere to add text, adjust font sizes (10-24pt), select colors, and click checkboxes with true vector checkmarks.

STEP 3

3. Flatten & Download Instantly

Click Flatten & Download. FormFlat burns all annotations into permanent PostScript vectors and strips the AcroForm catalog, preventing the mobile blank-screen bug.

Frequently Asked Questions

Can I fill out a flat, non-interactive PDF that has no form fields?: Yes! Unlike Adobe Reader or Preview which lock non-interactive PDFs, FormFlat allows you to click anywhere on the page to place clean, crisp text and vector checkmarks.
Are my confidential documents uploaded to a cloud server?: Never. FormFlat runs 100% in your local browser using WebAssembly and Web Workers. Your tax returns, leases, and medical records never touch our servers.
Why do filled PDFs from other sites show up blank on iPhone and Android?: Standard converters leave interactive AcroForm widgets behind. Mobile PDF readers in Gmail, WhatsApp, and iOS Files do not render these widgets. FormFlat flattens annotations directly into the PDF vector stream, ensuring 100% visual fidelity everywhere.
Is there a limit on how many PDFs I can fill for free?: No limits, no trial counters, and no credit card requirements. FormFlat is genuinely free and unconstrained.