Is a signature drawn on a phone legally valid?

For many everyday documents a drawn signature is accepted, but some contracts and official forms need a qualified electronic signature or wet ink. Check with the recipient when in doubt.

How do I fill a PDF that has no form fields?

Use a PDF markup tool to write or type directly on the page where the answers go, then zoom in to check alignment.

Should I keep a copy of forms I signed?

Yes. Always keep the final signed version, ideally with the date in the file name, in case questions come up later.

Signing and Filling PDF Forms on Mobile

A school permission slip, a rental agreement, a consent form for the dentist: forms arrive as PDFs at the worst possible moments. Printing, signing, scanning and sending them back is slow, and often there is no printer anyway. Signing and filling PDF forms on mobile is quicker and, with a few good habits, just as tidy as the paper version.

Know what kind of form you have

PDF forms come in two flavours, and they behave differently.

Type	How to recognise it	How to fill it
Fillable form	Tapping a box shows a cursor or a highlight	Tap each field and type
Flat form	It looks like a form, but it is just a picture of one	Write or type on top with a markup tool

Many forms you receive by email are flat: a scan or an export of a printed sheet. That is fine, but it means you place your answers yourself.

Before you start

A minute of preparation avoids rework:

Read the whole form first. Look for sections you need to skip, attachments you must add and where the signature goes.
Gather details. ID numbers, addresses, dates, account numbers. Having them in a note saves you from switching apps repeatedly.
Work on a copy. Keep the blank original in case you make a mess or need to fill it again next year.
Check the deadline. If it is due soon, add a task with a reminder now.

Filling the form neatly

On a small screen, neatness is mostly about zoom.

Zoom in on each section before writing. Small fields are much easier to hit when they fill the screen.
Use typed text where possible for names, numbers and addresses. It is easier to read than finger handwriting.
Keep a consistent size for your text so the form looks tidy.
Mark checkboxes clearly with a tick or cross that stays inside the box.
Write dates in the format the form asks for, for example DD/MM/YYYY.

If you need to write a longer answer and the box is small, write “see attached page” and add a separate page rather than squeezing tiny text in.

Using a stylus or your finger

Handwriting on glass takes practice. A stylus helps a lot, but a finger works if you zoom in far enough and write slowly. If your app lets you undo strokes, use it freely rather than trying to fix a messy letter by drawing over it.

Adding your signature

For most everyday forms, a handwritten signature drawn on the screen is accepted.

Zoom in on the signature line so you have room to sign at a natural size.
Sign a few times on a blank page first to warm up. Phone signatures often look shakier at first.
Keep the size realistic. It should fit the line, not cover the text around it.
Add the date next to it if the form asks.

When a drawn signature might not be enough

Some documents, such as certain legal contracts, property deals or government applications, may require a specific kind of electronic signature or an original ink signature. If the form or the sender mentions a particular method, follow it. When unsure, a short email asking “is a drawn signature acceptable?” saves trouble later.

Check before you send

A quick final review catches most mistakes:

Every required field is filled.
The signature and date are in the right places.
Nothing overlaps printed text.
All pages are included and in order.
Attachments, if requested, are added.

Then save the final version with a clear name, such as 2026-11-04_Dentist-consent_signed.pdf, and send it. If the file is too large to email, compressing it or merging attachments into one file helps; see merge, split and compress PDFs on your phone.

Protect what you sign

Signed forms often contain your signature, ID numbers and personal details together, which is exactly what someone misusing your identity would want. Avoid uploading them to random online tools, delete extra copies from your downloads and chat apps, and store the final signed version somewhere organised and private.

Doing this in Week Notes & Tasks

In Week Notes & Tasks you can import a PDF form, use PDF markup to write your answers and draw your signature with a finger or stylus, then keep the signed file next to related notes. Everything stays on your device with no account needed. PDF Studio can merge the form with required attachments or compress it for email, and a task with an exact reminder makes sure you send it before the deadline. Tag signed forms by topic, such as “school” or “home”, so they are easy to find next year.

Final thoughts

Filling and signing PDF forms on your phone is mostly about preparation and patience: read the form first, zoom in, type where you can, sign at a natural size and check everything before sending. Keep a clean original and a signed copy, and the next form that lands in your inbox will take minutes instead of a trip to a printer.