KeptPDF
Smallpdf
iLovePDF
Sejda
Adobe Acrobat DC
CompilaPDF
FoxyUtils Online PDF Tools
OnDevicePDF
a1Apps.co
Authenticator App by 2Stable
Microsoft Authenticator
Google Authenticator
LastPass Authenticator
Authy
KeptPDF is a PDF toolkit that runs entirely in your browser. Nothing uploads: every tool runs on your own device, so the document never touches a server.
What it does:
Who it is for: law firms, accounting practices, clinics, and anyone who shares documents they cannot afford to leak.
The core tools are free with no sign-up. Works offline as an installable app.
Authenticator App – Secure 2FA & MFA for Your Accounts Protect your online accounts with Authenticator App, a privacy-first solution for managing two-factor (2FA) and multi-factor authentication (MFA). Add an extra layer of security and control your digital life with ease.
Secure & Private by Design All data is encrypted locally on your device and in iCloud using end-to-end encryption. Only you can access your 2FA codes, even we can’t see them. No third-party servers, no compromises.
Encrypted Backup & Sync Automatically back up your 2FA codes, secret keys, and metadata to iCloud. Switching devices? Sync effortlessly across iPhone, iPad, and Apple Watch while staying fully encrypted.
Cross-Device Access Your authentication data is securely accessible on multiple Apple devices, ensuring you’re never locked out of your important accounts.
Easy Import from Other Apps Migrate from Google Authenticator, Microsoft Authenticator, or others using one-tap QR scan or CSV file upload. No hassle, no re-authentication needed.
Export Anytime Your data belongs to you. Export all codes securely via QR or CSV when needed — perfect for backup or migration.
Organize with Folders & Icons Group your accounts using folders. Easily assign custom or auto-fetched icons so you can visually identify services at a glance.
Home Screen Widget & Apple Watch Access and copy codes instantly from the Home Screen widget or Apple Watch. No need to open the app every time — authenticate faster.
Biometric & PIN Protection Lock your app using Face ID, Touch ID, or a 4-digit PIN. Auto-lock after inactivity prevents unauthorized access.
Compatible with Major Platforms Supports Google, Facebook, Instagram, Amazon, Twitter, Dropbox, Reddit, PayPal, Zoom, Uber, and many more services using TOTP-based authentication. Privacy Policy: https://sites.google.com/a1apps.co/privacypolicy-aiauthenticator/home
Terms of Use: https://blog.a1apps.co/terms-of-use-authenticator/?amp=1
KeptPDFKeptPDF's answer
The app is plain JavaScript with no front-end framework, which keeps it fast and keeps the code auditable.
PDF work happens in the browser using pdf.js for rendering and pdf-lib for writing. Text recognition uses Tesseract running as WebAssembly. Password and encryption handling uses a WebAssembly build of qpdf. It is a Progressive Web App, so it installs and works offline.
The thin server side is Node on Vercel, with Postgres for accounts, Stripe for billing, and Resend for email. None of those ever see a document.
a1Apps.co's answer:
-React Native
-Node.js
-AWS/Firebase
-End-to-end encryption
-TOTP/HOTP open standards
KeptPDF's answer
A family member got seriously ill. We spent most days at the hospital, and straight answers were hard to come by, so we leaned on AI tools to make sense of the records, notes, and lab results.
But you cannot paste a medical record into an AI chat. You have to strip the names, the ID numbers, the diagnoses first. And almost every tool we found either wanted to upload the whole file to a server, or "auto-redacted" by sending the document text to an online AI. That was the exact thing we were trying to avoid.
Most of this was happening on a phone, at a bedside. So I built the tool I needed: redaction that runs on the device, works on mobile, and never sends the file anywhere. That turned into KeptPDF, which is now a full PDF suite with over 20 tools, all local-first.
a1Apps.co's answer:
-Built to offer a secure, private, and user-friendly alternative to mainstream 2FA apps—without the bloat or data tracking.
KeptPDF's answer
Anyone who has to hand a document to someone else and needs the sensitive parts gone first.
In practice that is solo attorneys and small law firms, accountants and tax preparers, healthcare and records staff handling requests, HR teams, and individuals dealing with their own medical, legal, or financial paperwork.
The common thread is not an industry. It is a person who cannot upload a confidential file to a random website, and who does not have an enterprise IT budget to solve it.
a1Apps.co's answer:
-Privacy-conscious individuals
-IT professionals & developers
-Small businesses & remote teams
-Tech-savvy users managing multiple logins
KeptPDF's answer
KeptPDF runs entirely in your browser. Your file, and the text inside it, never leaves your device. Not to an AI, not even to us. You can open your browser's network tab and watch: the document bytes never go out.
Most online PDF tools upload your file to a server first, and some "AI redaction" services quietly send your document text to a third-party model. That is the exact risk people are trying to avoid when they redact something.
KeptPDF also does true redaction. The text is removed from the file, not covered with a black box you can copy out later. Every redaction produces a verification certificate you can share with the file.
a1Apps.co's answer:
-Works offline with no internet needed
-Encrypted backup & multi-device sync
-Clean, easy-to-use interface
-Fully privacy-focused—no tracking
-Supports multiple accounts with customization
KeptPDF's answer
Three reasons.
Privacy you can verify, not just a promise. Processing happens locally in the browser, so there is no upload step to trust. We do send anonymous usage counts for quota, and we say so plainly, but never your document.
Real redaction with proof. Removed text is permanently gone, and you get a certificate showing the file was checked for leftover extractable text. Automated detection cannot catch everything, so a final human review is still your job, and the tool says that too.
It works on a phone. Most PDF suites assume a desktop. KeptPDF was built and used on a phone first, so redacting a document while you are standing in a hallway actually works.
a1Apps.co's answer:
-Secure cloud backup and restore
-No data tracking or ads
-Cross-platform support
-Simple setup, powerful features
-Trusted by professionals and teams
KeptPDF's answer
KeptPDF is early and independent, and we do not publish customer names. The product is privacy-first by design: we never see your documents, and we do not track who our users are or what they work on. Publishing a client list would sit badly next to that.
The user base today is mostly solo attorneys, small firms, accountants, and individuals handling their own records.
a1Apps.co's answer:
-Currently focused on growing our user base and serving a wide range of individual users and small teams.
Smallpdf - PDF document management and conversion suite
Authenticator App by 2Stable - An extra step of security never hurt anybody. Enable two-factor authentication on your online accounts and let Authenticator App by 2Stable do the rest.
iLovePDF - Premium online PDF tool set
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.
Sejda - Split, merge and other powerful PDF tools.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.