Overview
Sudoku Printable is a free online tool that generates unlimited sudoku puzzles in PDF format. It offers 19 variants (Standard, Diagonal, Windoku, etc.), four grid sizes (4×4, 6×6, 9×9, 16×16), six paper formats, and multiple difficulty levels. No registration is required, and answer keys can be included. It's ideal for teachers, puzzle enthusiasts, and anyone who enjoys screen-free brain training.
just f*ing send it** (jfsendit) is a peer-to-peer file transfer service that uses WebRTC to stream files directly between browsers. No uploads to a server, no accounts, no storage. Files are end-to-end encrypted, and transfers can resume if the connection drops. It supports multi-GB files and folders. The service is completely free and requires no registration.
Feature Comparison
| Feature | Sudoku Printable | just f***ing send it |
|---|---|---|
| Primary Function | Generate and print sudoku puzzles | Peer-to-peer file transfer |
| User Interface | Web-based generator with live preview and settings | Minimalist drag-and-drop interface |
| Customization | 19 variants, 4 grid sizes, 6 paper formats, difficulty levels, font size | None – just file selection |
| Output | Printable PDF with optional answer keys | Short code for direct transfer |
| Registration Required | No | No |
| Data Storage | No user data stored | No files stored on server; ephemeral signaling only |
| Encryption | Not applicable (printable puzzles) | End-to-end encrypted WebRTC |
| File Size Limit | N/A | Multi-GB files supported |
| Resume on Drop | N/A | Yes |
| Target Audience | Teachers, puzzle enthusiasts, parents, seniors | Anyone needing quick, secure file sharing |
| Variants/Options | Standard, Diagonal, Windoku, Odd/Even, Knight, Jigsaw, etc. | Single transfer mode |
| Accessibility | Large print option, kid-friendly grids | No specific accessibility features mentioned |
Pricing
Sudoku Printable: Completely free. No registration, no payment, no limits. Generate unlimited puzzles.
just f*ing send it:** Completely free. No registration, no payment, no limits. Transfers are free.
Pros and Cons
Sudoku Printable
Pros:
- Extremely customizable – 19 variants, multiple grid sizes, paper formats
- No registration or account needed
- Instant PDF download or direct print
- Includes answer keys for self-checking
- Kid-friendly options (4x4, 6x6) for educational use
Cons:
- 16x16 grid is still in beta (may not have unique solutions)
- Limited to sudoku puzzles only – no other puzzle types
- No mobile app – web-only
just f***ing send it
Pros:
- True peer-to-peer – no server storage, maximum privacy
- Supports large files and folders
- Resumable transfers if connection drops
- No registration, no account, no limits
- End-to-end encryption by default
Cons:
- Requires both sender and receiver to be online simultaneously
- Short-lived codes – must share quickly
- No file scanning or moderation – user assumes all risk
- Minimal interface – no advanced features like password protection or expiration
Verdict
Choose Sudoku Printable if you need a versatile, free puzzle generator for education or leisure. It's perfect for teachers creating classroom materials, parents looking for screen-free activities, or puzzle enthusiasts who want endless variety. The customization options are unmatched for a free tool.
Choose just f*ing send it** if you need a private, encrypted, no-hassle way to transfer large files directly between devices. It's ideal for sharing sensitive documents, large media files, or folders without relying on cloud storage. The peer-to-peer architecture ensures maximum privacy.
Both products excel in their respective niches with zero cost and no registration. Your choice depends entirely on whether you need puzzles or file transfers.
just f***ing send it
Sudoku Printable