Latest Version in 2026｜PDF Editing Tools Completely Free of Charge
Comprehensive Comparison Guide to
Free PDF Editing Tools
A comprehensive comparison of 5 tools based on security, features, usability, and Japanese language support. Find the perfect one for you.
Have you ever wondered, “Do I really have to buy expensive software just to make a few minor edits to a PDF?” Actually, there are now many tools available that allow you to edit PDFs with high quality—completely free of charge.
In this article, we’ve thoroughly compared five leading free PDF editing tools based on the following criteria:
- Security (whether files are sent to a server)
- Feature Set (merge, split, compress, convert, etc.)
- Ease of use (Is it intuitive even for beginners?)
- Japanese language support (Is the UI in Japanese?)
- Compatibility (PC, smartphone, Mac, etc.)
When you upload PDFs containing company contracts or personal information to an online tool, the files are temporarily sent to the server. If you are concerned about the risk of data leaks, choose a tool that supports "in-browser processing (local processing)," as described below.
- Benri-Kit — A Japanese-made tool with fully local processing
- iLovePDF — A versatile tool with top-tier functionality
- Smallpdf — The Industry Standard Used by 1 Billion People Worldwide
- CubePDF Utility — A Japanese-made, completely free desktop version
- PDF24 Tools — A Multi-Functional Tool with No Restrictions
- 5-Tool Comparison Chart
- Recommended Rankings by Use Case
Benri-Kit: No. 1 Recommendation for Local Processing
Benri-Kit is a PDF and image editing tool developed by Japanese engineers that operates entirely within your browser (local processing). Uploaded files are never sent to external servers; everything is processed solely within your browser. This is its greatest strength, one that other online tools lack.
Key Features
Pros
- Files will never be leaked outside
- Completely free—no registration required
- Japanese UI (intuitive operation)
- Safe to use even for confidential documents
- Includes image tools and QR code generation in addition to PDF features
Points to note
- Does not support direct text editing
- No OCR functionality
- Does not support electronic signatures
iLovePDF Online
iLovePDF is an online PDF editing service provided by iLovePDF SL in Spain. Widely used in educational settings and government offices, it combines a wealth of features with simple operation. Even the free plan allows you to use most of the basic features.
Key Features
Pros
- Top-tier feature set
- Intuitive UI (even beginners won’t get lost)
- Can be linked with a Microsoft account
- Available on iOS and Android
Cons
- Files are uploaded to the server
- The free version has a daily processing limit
- Some features (such as OCR conversion) are available only with a paid plan
Smallpdf Online
Smallpdf is a Swiss-based online PDF service with a global reputation for reliability and proven results. It is particularly renowned for the quality of its PDF-to-Word/Excel/PowerPoint conversions and compression. One reason for its popularity is its visual and intuitive UI, which is more user-friendly than Adobe Acrobat.
Key Features
Pros
- Very high conversion quality
- The UI is very simple and intuitive
- Fast processing speed
- Works perfectly with touch devices like the iPad
Cons
- The free version has a strict limit of two tasks per day
- Files are uploaded to the server
- Does not support web page conversion
CubePDF Utility: Fully free local processing
CubePDF Utility is a Windows PDF tool developed by the Japanese company Cube Soft. Since all file processing takes place entirely on your PC, there is zero risk of data leakage, and it can be used completely free of charge with no functional limitations. While it does not support text editing, it offers a compact set of features essential for page management.
Main Features
Pros
- Completely free with no restrictions
- Works offline (no internet connection required)
- Lightweight and runs smoothly
- Japanese UI makes navigation easy
Cons
- Windows only
- Requires installation
- Does not support conversion, OCR, or digital signatures
PDF24 Tools Online: Completely Free
PDF24 Tools is a collection of PDF tools provided by Geek Software GmbH in Germany. There are absolutely no paid plans; all features are available for free forever. In addition to the online version, a Windows desktop version (which can be used offline) is also available, and both are free. With over 45 features, it ranks among the best in the industry.
Main Features
Pros
- Completely free with no restrictions
- Over 45 features
- OCR and digital signatures are also free
- Offline use available in the desktop version
Cons
- Too many features make the UI confusing
- Data is sent to the server in the online version
- Ads are displayed
| Item | Benri-Kit | iLovePDF | Smallpdf | CubePDF | PDF24 |
|---|---|---|---|---|---|
| Completely free | ◎ | △ | △ | ◎ | ◎ |
| Local processing | ◎ | ✕ | ✕ | ◎ | △※ |
| Merge & Split | ○ | ○ | ○ | ○ | ○ |
| PDF Conversion (Word, etc.) | ✕ | ○ | ○ | ✕ | ○ |
| OCR (Optical Character Recognition) | ✕ | △ Paid | ✕ | ✕ | ○ |
| Electronic Signatures | ✕ | ○ | ○ | ✕ | ○ |
| Add Watermark | ○ | ○ | ✕ | ✕ | ○ |
| Password Protection | ✕ | ○ | ○ | ○ | ○ |
| Mobile-friendly | ○ | ○ | ○ | ✕ | ○ |
| Japanese UI | ○ | ○ | ○ | ○ | ○ |
| No installation required | ○ | ○ | ○ | ✕ | ○ |
| Number of features | Medium | Plenty | Many | Few | Most (45+) |
*Note: PDF24 performs local processing in the desktop version and sends files to a server in the online version. ◎ = Best ○ = Supported △ = Partially supported ✕ = Not supported
Security-Focused (For Those Handling Confidential Files)
Benri-Kit
The only online tool where files never leave your device. Ideal for contracts, personal information, and My Number documents.
CubePDF Utility
An installable application that runs entirely on your PC. No internet connection required. Windows only.
Feature-focused (for those who want to do it all)
PDF24 Tools
Unlimited free access to OCR, digital signatures, conversion, watermarking, and compression. Over 45 features.
iLovePDF
High-quality features and user interface. Excellent mobile app.
Focus on ease of use (for beginners)
Smallpdf
A prime example of a simple UI used worldwide. Intuitive and easy to use.
Benri-Kit
Its features are streamlined, so even beginners won’t get lost.
Focus on conversion (for those who want to convert PDF to Word or Excel)
Smallpdf
Industry-leading quality and speed for PDF-to-Office conversions.
iLovePDF
Offers a wide range of conversion features, including OCR conversion for scanned PDFs.
Free PDF editing tools each have their own areas of expertise. While "all-in-one" tools are convenient, they also carry the risk of your files being sent to external servers.
✔ For confidential documents → Benri-Kit (local processing) or CubePDF (desktop app)
✔ For general use → PDF24 Tools (completely free, no restrictions)
✔ For frequent Word conversions → Smallpdf (No. 1 in conversion quality)
✔ If you want a well-rounded tool → iLovePDF (combines features and ease of use)
Start by choosing a tool based on the features you use most often and the sensitivity of the files you handle. Since all of these tools are free to try without registration, the best approach is to actually try out the ones that interest you and compare them.
This article is based on information current as of March 2025. The specifications of each tool are subject to change.