Alternatives

Products that do what LockDoc does

Send encrypted files through GMail and Outlook

1
Send by Firefox▲478
Share large files online, encrypted for free
2017
2
Send/Share Files by Couchdrop▲135
Send encrypted file links instead of email attachments
Oct 2025
3EE
Easy Email Encryption inside Gmail (Alpha, Open-Source)▲170
2013 · streak.com
4
SendSecure.io▲96
Send and share files securely, directly and free
2019
5
Hirosend▲90
Secure File Sharing Made Simple
Nov 2025 · hirosend.com
6
End to End Encryption File Sharing▲90
Securely share sensitive files
2022
7FU
Free Unlimited Private File Sending (Beta)▲120
2012 · wireover.com
8
transferfile.io▲85
Encrypted filesharing through the IPFS network
2021
9
Save Emails to PDF by cloudHQ▲160
Convert Gmail to PDF (locally)
2022
10
LockBridge▲134
Secure and seamless file transfer with zero-trust encryption
2024
11
NordLocker▲87
Store and share your files securely
2020
12
Encrypto▲141
Encrypt the files you send.
2015
13
ShareBox▲104
Effortless secure file sharing
Sep 2025
14
Secure Send for Slack▲75
Send files securely without leaving your Slack channel!
2020
15
ySendit▲73
Send data without limits
2020
16EE
Encrypted end-to-end file transfer▲33
2013 · github.com
17EF
Encrypted Filedrop: Receive files protected by end-to-end encryption▲7
2022 · encryptedfiledrop.com
18EI
EmailPK – Instant encrypted email▲53
2014 · diafygi.github.io
19
Tresorit Send▲74
Ultra-secure, end-to-end encrypted large file sharing.
2018
20ES
Easily send encrypted email from your existing email▲22
2014 · virtru.com
21
SysTools PDF Locker to Lock PDF Files▲6
PDF Locker Tool to Lock PDF With Password and Permission
Oct 2025
22
SecurePDF▲5
Browser-based pdf encryption and password protection
2025
23
UnlockPDFNow▲3
Unlock secured PDFs in your browser—Private & Ad-free.
Feb 2026 · unlockpdfnow.com
24UA
Upload and share files without limits – Secure, anonymous, free▲10
2016 · uploadfiles.io

Ranked by how close each launch is in meaning, then by votes. Refine with a description →