How to Sign and Send Documents When You Only Have a Phone

First, the honest limit: PaperKit has no e-signature tool

PaperKit has NO e-signature tool. Nothing on the site draws, types or applies a legally binding signature to a PDF, and this guide will not pretend otherwise. If a form, contract or employer asks for a legally binding signature, you need a dedicated signing app for that step. Use PaperKit for everything around the signature — preparing, merging and marking the file — and use the signing app for the signature itself.

What you can do entirely on a phone with PaperKit

Three jobs work fully on a phone in your browser, with no account and no upload. First, photograph each page flat and in order, then rebuild the photos into one PDF with JPG to PDF, which accepts JPG and PNG images and offers A4 or fit-to-page with a zero-margin option. Second, merge that file with other documents, such as a cover letter or ID copy, using Merge PDF. Third, mark the file before sharing with a text watermark, as explained below.

A text watermark is a marking, not a signature

Watermark PDF adds diagonal text, up to 50 characters, at one of three opacity levels. That is useful for marking a copy, for example with your name and the date, so a shared draft is clearly identified. It is text only: there is no logo or image watermark.

Do not present a text watermark as a signature. A watermark does not prove who signed, does not bind anyone to the document, and will not satisfy a recipient who asked for a signed original. If the instructions say signed, use a dedicated signing app and follow its steps, then send the signed file. For marking drafts in general, see How to Mark a PDF as Draft or Confidential with a Watermark.

A phone workflow, step by step

1. Photograph every page flat, in reading order, with the whole page in frame.
2. Rebuild the photos into one PDF with JPG to PDF, choosing A4 or fit-to-page.
3. Merge in any extra documents, such as a cover page or ID copy, in the order the recipient expects.
4. If a real signature is required, sign with a dedicated signing app. Otherwise, add a text watermark with your name and date as a marking only.
5. Check the size and send the file. Remember the common email limits: Gmail 25MB, Outlook.com 25MB, Yahoo 25MB and iCloud 20MB. If the file is too big, see How to Send a Large PDF File That Is Too Big for Email.

Before you send

Open the finished file on your phone and check it page by page: every page present, every page upright, and the watermark, if any, readable but not covering important text. Remember that merge joins whole files only, with no reorder feature, so fix the order before merging rather than after. Password-protected PDFs must be unlocked in the application that created them first; no PaperKit tool bypasses a password.

For the bigger picture of work, school and official documents, see the pillar guide PDFs for Jobs, School and Government Forms: A Practical Playbook.