Dev tools · alternatives · 2026

24 alternatives to PDF Signify

Sign PDFs easily with a digital certificate multiple times

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. PDF Signify launched in 2024; newer entries below may have overtaken it.

1. 1
   open-pdf-sign▲105

   Open-source tool for digitally signing PDFs

   2022 · openpdfsign.org · its alternatives →

2. 2
   DocuSec▲65

   Simplest secure sign documents

   2022 · its alternatives →

3. 3
   Just sign PDF▲82

   Sign your PDF locally without uploading it to any server

   2023 · its alternatives →

4. 4
   Fill▲84

   The smart way to fill, send, sign & store PDF's

   2019 · fill.io · its alternatives →

5. 5PA
   PDF API – Generate, convert, and modify PDF documents▲204

   Hi HN, Arek here. We’re super excited to officially launch PSPDFKit API [1]. PSPDFKit API is a collection of HTTP APIs that enable you to convert, generate, and edit documents without running any service on your infrastructure. What differentiates our API from others is that you can chain together multiple “actions” as part of a single API request. For example, you can convert, OCR, watermark, edit, and flatten a document — all in one call. Available actions [2]: - PDF Generator - PDF Converter - Image Converter - OCR - Watermark - Merge - Split - Duplicate - Delete - Flatten Our…

   2022 · its alternatives →

6. 6
   PDF Sign & Fill▲7

   Best app for signing, editing pdf documents

   2025 · apps.apple.com · its alternatives →

7. 7
   PDF merge API▲98

   Create PDF documents from data and templates

   2024 · its alternatives →

8. 8
   Pdf Sign by Doctual▲5

   Electronically sign documents for free.

   2018 · its alternatives →

9. 9
   Autosign▲64

   Sign PDF documents online automatically

   2022 · its alternatives →

10. 10
    OpenSign™: Open Source DocuSign & more▲109

    Enterprise-Level Document Signing Goes Open-Source

    2023 · opensignlabs.com · its alternatives →

11. 11
    Sign and Return▲119

    Free PDF filling and signing over email.

    2016 · signandreturn.com · its alternatives →

12. 12
    UsignDoc▲92

    Simplify e-signing, secure your docs

    2024 · its alternatives →

13. 13
    Easy Signature: Sign Documents▲8

    android, googleplayapp, toolapp, digitalsign, documentsign

    2025 · play.google.com · its alternatives →

14. 14
    PDFlastica▲9

    Sign PDFs offline with typed and drawn signatures

    Jul 2026 · garmahis.com · its alternatives →

15. 15
    Sign PDF. Add real handwritten signature▲6

    The only PDF signing tool for adding real signature to PDF

    Jul 2026 · sign-pdf.online · its alternatives →

16. 16FP
    Free PDF signing over email▲16

    2016 · signandreturn.com · its alternatives →

17. 17
    Sign.net▲62

    Verifiable digital signatures with 24x7 support

    2021 · sign.net · its alternatives →

18. 18
    SignPDF.fit▲5

    Sign a PDF in seconds — no account needed

    Jan 2026 · pdf.fit · its alternatives →

19. 19
    AcceptSignature.com▲7

    Digital PDF signature software

    2022 · acceptsignature.com · its alternatives →

20. 20
    Sign PDF - Digital signature▲6

    Sign PDF documents with realistic hand-drawn signatures

    Mar 2026 · play.google.com · its alternatives →

21. 21
    EasyPDFSign▲1

    Free PDF tools for signing, editing, and managing documents

    Sep 2026 · easypdfsign.com · its alternatives →

22. 22
    MyPDFSign▲7

    Free, fast, and private online PDF signature tool

    2025 · its alternatives →

23. 23
    Sign PDF

    Sign PDF online with ONEPDF at ease

    2023 · onepdf.online · its alternatives →

24. 24
    Add Your Signature▲3

    Drop a PDF, sign it, done. All in your browser.

    May 2026 · addyoursignature.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →