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.

How does the photo signature shadow-removal work?

You can snap a photo of your signature on white paper. FormFlat processes the image locally using an adaptive luminance threshold algorithm, converting dark ink into clean transparent vectors while eliminating ambient paper shadows.

Is my digital signature legally binding?

Yes, electronic signatures placed on commercial agreements, NDAs, and standard contracts are recognized under the US ESIGN Act, UETA, and eIDAS in the European Union.

Will my signature be saved on your database?

No. FormFlat operates without any database or backend user storage. Signatures reside only in your local session and optional browser cache.

Sign PDF Online Free — No Registration, No Watermarks

Draw with smooth Bezier curves, type in executive cursive styles, or snap a photo of your paper signature with automated shadow-cleaning and background transparency extraction.

Step-by-Step Guide

STEP 1

1. Open Your PDF

Select your lease, contract, or NDA. The file loads instantly in high-DPI resolution without leaving your machine.

STEP 2

2. Create Your Signature

Choose Draw for stylus/mouse signing, Type for typography styles, or Upload Photo to automatically strip paper background and shadows.

STEP 3

3. Stamp & Flatten

Place your signature anywhere with pixel precision, then export a finalized, flattened PDF ready for legal submission.

Frequently Asked Questions

How does the photo signature shadow-removal work?: You can snap a photo of your signature on white paper. FormFlat processes the image locally using an adaptive luminance threshold algorithm, converting dark ink into clean transparent vectors while eliminating ambient paper shadows.
Is my digital signature legally binding?: Yes, electronic signatures placed on commercial agreements, NDAs, and standard contracts are recognized under the US ESIGN Act, UETA, and eIDAS in the European Union.
Will my signature be saved on your database?: No. FormFlat operates without any database or backend user storage. Signatures reside only in your local session and optional browser cache.