Read, edit and sign PDFs
free for Windows
PDF tools, everyday documents and drawing review
— all in one app
Area 16.75 m²
What do you need to do today?
Open the program, pick a task on the start page, then pick your file. No menus to hunt through.
Combine, split or organise
Join several files into one, take some pages out, rotate or reorder them.
Sign documents
Draw with the mouse, type your name or use a picture of your signature, then place it anywhere.
Certified-copy stamp
Stamp a copy of an ID card in one click, with what it is for and the date.
Convert to Word or Excel
Tables stay tables, and numbers in Excel still calculate.
Fill in forms, fix typos
Type into PDF forms, or correct short Thai or English text in the file.
Review drawings
Open .dwg files and measure lengths and areas, without AutoCAD.
Make an e-Tax Invoice
Fill in the items and get a PDF/A-3 with the Thai Revenue Department's XML.
Clean up scans
Straighten tilted pages, trim dark edges and delete blank pages in one go.
Insert pictures, lines and symbols
Place a picture, then move or resize it. Draw lines, arrows or freehand on the page.
See everything else it does
Search text · OCR for scans · Highlights and comments · Create forms · Passwords · Edit, sign and redact password-protected files · Permanent redaction · Split by bookmarks · Convert to PowerPoint · Compress · PDF/A · Compare documents · Watermarks · Page numbers · Many files at once · Digital ID signatures · Rubber stamps · Amounts in words · Several pages a sheet and booklets · Recovery of unsaved work
Install in 3 steps
At step 2 Windows shows a blue screen. That is normal for free programs from small developers.
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Step 1
Click Download
You get YRK.EasyPdf-win-Setup.exe in your Downloads folder.
YRK.EasyPdf-win-Setup.exe
84 MB · double-click to open
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Step 2
If a blue screen appears
Click More info, then Run anyway.
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Step 3
It opens, ready to use
There is an icon on your desktop. Pick a task on the start page.
The blue screen does not mean a virus, but download only from this page · Why it appears · How to check the file
Frequently asked questions
Click a question to see the answer. Can't find what you need? Ask us
General
Is it really free? Any hidden costs?
Every feature is free. There is no paid version, no trial that runs out, no ads, and no credit card or account needed.
Can I use it at work or in a company?
Yes. It is free for personal use, at work and in companies, on any number of computers.
Does it work on a Mac or a phone?
For now it runs only on 64-bit Windows 10 and 11.
Does it need the internet?
No. Everything works offline, except OCR in a language not on your computer yet, which downloads that language once. Otherwise it goes online only to check for updates (if you allow it) and to timestamp a digital signature (if you choose to).
What is the difference between the installer and the zip?
The installer adds icons on the desktop and in the Start menu. The zip needs no installing: unzip it and open the program, and delete the folder when you are done with it. Both update themselves.
Installing and safety
Why does a blue “Windows protected your PC” screen appear?
It comes from Microsoft Defender SmartScreen, which warns about programs without a publisher certificate (code signing). The certificate is a yearly purchase that free programs from small developers often don't have yet, so Windows shows “Unknown publisher”.
The warning does not mean a virus was found. If you downloaded from this page or from github.com/YR-KEN426, click More info, then Run anyway. If the file came from anywhere else, such as a chat, don't open it: download it again from this page.
How do I check the file before installing?
1. Scan it: right-click the file and choose “Scan with Microsoft Defender” (on Windows 11 it is under “Show more options”).
2. Compare its fingerprint (SHA-256): open PowerShell in your Downloads folder, type Get-FileHash .\YRK.EasyPdf-win-Setup.exe and compare the result with the sha256 value on the latest release page. If they match, it is the same file we published.
My antivirus warns about it. What should I do?
Stop installing first. Check that you downloaded it from this page and that the SHA-256 matches, then tell us the antivirus name, the threat name it shows and the file's version. We will look into it and reply.
Why does it install without administrator rights?
It installs only into your own user account (the AppData folder) and doesn't touch system files. The one exception: on a computer without the Microsoft Visual C++ Runtime that OCR needs, the installer asks for permission to install that Microsoft component.
Are my documents sent anywhere?
No. Documents are opened and edited only on your computer, never sent to AI or cloud services (OCR runs on your computer), and no usage statistics are collected. See the details in the program: Settings → Privacy and safety.
Are automatic updates safe? What if someone fakes one?
Every update is signed with the developer's key, and the program installs only updates whose signature matches the key built into it. If someone changes an update file, the signature no longer matches and the program won't install it.
Using it
How do I combine files, or take some pages out?
Open the program, choose “Combine PDF” or “Split PDF” on the start page, then pick your files. The result is saved as a new file; your original stays as it was.
How much text can I edit in a PDF?
You can edit Thai and English text and choose the font and size. It is meant for fixing words or short lines, not for laying out a whole page again.
I converted to Word and got only pictures, no text
That is usually a scanned file, which holds only images. Run OCR first, then convert to Word or Excel. Converting works best on documents with real text.
Where are saved signatures kept? Are they safe?
If you choose to keep a signature for next time, it is encrypted and stored only on this computer.
What is the difference between a signature and a Digital ID signature?
A signature is a picture of your handwriting placed on the document. A Digital ID signature proves who signed and shows if anyone changes the document afterwards.
Can I send e-Tax Invoices from this program for real?
The program makes a PDF/A-3 with the Revenue Department's XML inside, and a sample XML passed the structure check on etax.rd.go.th. Before real use you must register for the e-Tax system with the Revenue Department, and in this version the XML has no separate XAdES signature. Check your own XML and test before sending. The steps are in the guide.
YRK PDF e-Tax status
- Follows ETDA standard ขมธอ. 3-2560, version 2.0
- A sample XML file passed the structure check on the Revenue Department's validation page
- It has never been tested by actually submitting to the e-Tax Invoice system
- It is not certified by the Revenue Department
- YRK PDF is not an e-Tax Invoice service provider. You must check the file and are responsible for submitting it yourself
If I redact something, is my original file lost?
No. The result is saved as a new file, and the redacted content is really removed from that new file. The original doesn't change.
Drawings
Does it really open AutoCAD files? Do I need AutoCAD?
It opens .dwg and .dxf files directly, without AutoCAD, with their layers and scale. Drawings with special fonts or objects may look slightly different from AutoCAD.
What can I measure on a drawing?
Lengths, lengths along a line, and areas at the drawing's scale, and you can count items on the drawing, such as lights and sockets. Drag a corner to correct a measurement, or press Ctrl+Z to undo it.
Can I send a drawing to someone without CAD software?
Yes. Save it as a PDF and send that. Each layout becomes a PDF page at its real scale.
Updates and feedback
How do I update the program?
If you allow update checks, the program downloads a new version by itself and then shows a “Restart to update” button. Nothing is installed until you click it. You can also download the installer from this page again.
In version 1.1.3 and older, the start page covers this button. If you don't see it, open any PDF and wait about half a minute: the button appears at the top.
How do I uninstall it?
Go to Windows Settings → Apps, choose YRK PDF → Uninstall. For the zip, just delete the folder.
How can I support the developer?
YRK PDF is free with every feature and will stay that way; nothing is locked behind sponsorship. If it makes your work easier, support is welcome and entirely voluntary. It pays for a code-signing certificate (fewer warnings when installing), development time and the costs of other platforms.
From abroad: GitHub Sponsors, monthly or once.
In Thailand: scan the PromptPay code with any banking app, any amount.
Thank you!
I'm stuck, or I'd like a new feature. Where do I tell you?
In the program: Help → Suggestions and problems. Or use the feedback form (no sign-in), or email yrken.official@gmail.com.
YRK PDF Privacy Policy
Last updated: 5 November 2026
YRK PDF is a free Windows program that runs on your computer. We wrote this policy to be clear about what the program does with your data.
At a glance
- Your documents stay on your computer. The program does not upload your files anywhere.
- No account or login is required.
- No AI, usage tracking, ads, or error reports sent from your computer.
- YRK LAB receives no data from the program unless you contact us.
When the program uses the internet
The program connects to the internet only in these 5 cases. In every case, your document contents are not sent.
- Check for a new version: The program asks the download page on GitHub whether a new version is available. If so, it downloads it and installs it only when you click Restart. Every update file must pass YRK signature verification first.
- The first time you open the program, it asks whether to check automatically. You can change this later at Settings → Privacy and safety.
- Download OCR language data: Downloads from the Tesseract project on GitHub once per language, after you confirm.
- All text recognition happens on your computer.
- Sign with a timestamp: The program sends the signature hash to the timestamp authority (DigiCert by default), without sending the document.
- Used only when you select this option.
- Sign for long-term validation (LTV): The program downloads the certificate revocation list (CRL) from the certificate authority named in the certificate.
- Used only when you select this option.
- Open a PDF signed with a certificate from an authority trusted by Windows: Windows may ask the certificate authority whether the certificate has been revoked, without sending the document.
In all the cases above, the destination provider (GitHub, the timestamp authority, or the certificate authority) sees your IP address as is normal for an internet connection. Each has its own privacy policy.
Links in the Help menu (manual, FAQ, feedback) open in your browser, not in the program. This privacy policy and the support the developer window open inside the program and use no internet. The GitHub Sponsors button in the support window opens your browser only when you click it.
- The email feedback button fills in the program version, Windows version, and language in the email. You can edit or delete them before sending.
Data stored on your computer
The program stores data at %LOCALAPPDATA%\YRK\EasyPdf. No data is sent from your computer.
| Data | What is stored | Protection |
|---|---|---|
| Settings | Language, update checks, units | Not encrypted |
| Recent files | Names and locations of up to 12 recently opened files; no contents | Not encrypted · Can be cleared with the "Clear recent files list" button |
| Stamps | Text and appearance of stamps you create | Not encrypted |
| Seller details for e-Tax | Name, tax ID, branch, address, phone, email, and latest document number | Not encrypted |
| Digital signing settings | Most recently used Digital ID, reason, location, and timestamp server | Not encrypted; passwords are not stored |
| Saved signature images | Images of signatures | Encrypted using Windows protection tied to your user account |
| Digital IDs | Certificates and keys for digital signing | Protected by the Digital ID password |
| Recovery copies | Copies of unsaved documents, written every 1 minute while editing | Password-protected files retain their original password · Deleted when you save, discard, or close the program normally |
| OCR language data | Downloaded language files | Files are checked for integrity before use |
| Error logs | Program error details, which may include file or folder names | Not sent from your computer · Up to 1 MB per day · Automatically deleted after 14 days |
Temporary files: While running, the program may store temporary copies in the Windows Temp folder, for example for undo or to convert DWG files.
- Password-protected files are not written to unencrypted temporary files.
- Temporary copies are deleted when you close the program, or the next time you open it if it was not closed normally.
Deleting data: Open the data folder from Settings → Privacy and safety → "Open data folder", then delete any files you do not want.
- Uninstalling the program does not delete this folder. To delete everything, delete
%LOCALAPPDATA%\YRK\EasyPdfyourself.
This website
- This website is hosted on GitHub Pages, which may collect visit data under GitHub’s policy.
- The website does not use cookies, trackers, or load resources from other websites.
- The feedback form uses Google Forms. Information you enter is sent to Google under Google’s policy, and YRK LAB uses it only to reply and improve the program.
- The support the developer button takes you to GitHub Sponsors or displays a PromptPay QR code. Payments are subject to the provider’s terms.
Contact
- Email: yrken.official@gmail.com
- Report a security issue: through the project’s GitHub Security Advisory or by emailing us with “Security” in the subject line.
Policy changes
If a new version of the program changes how data is handled, we will update this page and note it in the release notes.
This policy is provided for transparency and is not a legal guarantee.
