Construct PDF RU Download for free

A PDF editor with everything you need. Free.

A practical helper for work and study. Edit, sign, merge, and prepare files to send. Recognize text in scans, straighten pages, and compress files in one click — even offline.

Download for WindowsMicrosoft Store — soonVersion 1.5 · 22 MB · Windows 7, 8.1, 10, and 11 · Linux and Android soon
StudyPage numbers

Added from page 3, the way the study guide requires.

StudyFile compressed to 10 MB

The university student portal will accept it the first time.

Edit text and imagesAdd textForm fieldsNotesStampsHide dataFind and replaceScanRecognize text (OCR)Edit scanned textStraighten a scanStamps and signaturesElectronic signatureSign a batchImage signatureCheck signaturesMerge filesExtract and insertSplit PDFPage numbersFit to A4Header and watermarkCheck before sendingSave as .docxTables to .xlsxCompress to sizeSave as imagesPassword protectRemove protectionCompare documentsHot folderPDF printerBookmarksAttachmentsSearch a folder
Who it's for

For study, work, and home

Everyone has PDFs: coursework and study guides, contracts and invoices, bid packs and as-built documents, school forms and receipts. Pick what is closest to you.

Coursework from parts

Put the title page, the main text, and the appendices in one file, and number the pages starting where you need.

Merge · Page numbers

Page photos into a PDF

Photographed lecture notes or a book on your phone? Straighten the pages and recognize the text so search works.

Straighten · Recognize text (OCR)

The site will not take the file

The portal or email will not take a heavy file? Compress it to the size you need, in one click.

Compress to size
Scans

Edit scanned text the way you edit an ordinary document

A typo in a certificate, a wrong date, an extra digit — fix it on the scan. The new letters are taken from the document’s own print, and the rest of the page stays as it is.

  • Recognition of Russian and English text — offline
  • Uncertain words are highlighted — you can check them in a minute
  • A crooked scan is straightened in one click
More about scans
Certificate No. 04210412 of enrollment
issued to a student in group EC-21EC-31
Anna Ivanova
stating that she is enrolled in year 23 part-timefull-time of the program
in the field 38.03.0238.03.01 “Economics”.
Issued: 15 Sep 202515 Sep 20266 edits
Certificate of completion

Client: Cornflower LLC

Contractor: Daisy LLC

The work is complete and on time.

There are no complaints about the quality.

Straightened
Reconciliation statement

as of 30 Nov 2025

between Daisy LLC and Cornflower LLC

Balance in favor of Daisy LLC: 16,200.00 RUB

Balance we confirm.

“balance” — 2 found

Stamps and signatures

A stamp and a signature — as separate objects

Stamps and signatures on a scan are found on their own, even on top of tables and text. You can move them, copy them to another file, or place them under or over the text.

How it works
LLC
DAISY
MOSCOWBackground removed

General director

Daisy LLC ____________ Petr Petrov

Seal

LLC
DAISY
MOSCOWStampSignature

New in 1.4

Fill in forms right in the PDF

You no longer need to print a questionnaire, an application, or a school form and fill it in by hand. Open the file, even a scan: lines, digit boxes, and tick squares become fields. Click and type.

  • Click a line and type; Tab moves to the next one
  • SNILS, tax ID, account number — each digit in its own box
  • The filled-in form opens on any computer and prints evenly
FORM
Last name
First and middle name
Date of birth
Phone
Student Employee
Fields found: 6

GOST · CryptoPro CSP

Electronic signature — right in the PDF

Sign a document with your certificate via CryptoPro CSP: the signature is embedded in the PDF together with a stamp on the page, or saved as a separate .sig file. You can sign a whole batch at once. Someone else’s signature is easy to check: who signed, when, and whether the document changed afterwards.

More about signatures
Invoice No. 181October 2026Signed
Invoice No. 182October 2026Signed
Certificate No. 64October 2026Signed
Certificate No. 65October 2026Signed
Signed 4 of 4, the PIN was entered once
Document signatures
Signed byMaria Orlova
Signature date12 Mar 2026, 14:05
Certificatevalid until 1 May 2027
Documentnot changed after signing
Signature is valid

Check before sending

Documents are accepted the first time — in court, at the tax office, at a university, or in a tender

Choose where you are sending the documents. The files are checked against the portal’s current rules, and the package is ready in one click.

Moi ArbitrGAS PravosudieFNSGosuslugiEISStudent portalEmail
Text in the scans is recognized, so search works
File size is brought down to the portal’s limit
Each document is saved as its own file
The name shows the page count: “Certificate, 3 p.”
.sig signature files are created for every document at once
Merging adds a list of attachments
Before
contract-scan.pdf38 MB
act1.jpg6 MB
Document (3).docx1 MB
After
Supply agreement, 5 p.pdf2.1 MB
Acceptance certificate, 1 p.pdf0.4 MB
Power of attorney, 1 p.pdf0.3 MB
2.8 MB of 10 MB — within the portal limit

And everything else, close at hand

All features

Editing

  • Edit text and images
  • Add text
  • Form fields
  • Notes
  • Stamps
  • Hide data
  • Find and replace

Scans

  • Scan
  • Recognize text (OCR)
  • Edit scanned text
  • Straighten a scan
  • Stamps and signatures

Signature

  • Electronic signature
  • Sign a batch
  • Image signature
  • Check signatures

Pages

  • Merge files
  • Extract and insert
  • Split PDF
  • Page numbers
  • Fit to A4
  • Header and watermark

Save and send

  • Check before sending
  • Save as .docx
  • Tables to .xlsx
  • Compress to size
  • Save as images
  • Password protect
  • Remove protection

More

  • Compare documents
  • Hot folder
  • PDF printer
  • Bookmarks
  • Attachments
  • Search a folder

Documents are not sent to the internet. Recognition, signing, and compression run on your computer.

No sign-up and no accounts. The program does not collect data about you or your files.

System requirements

Windows 7, 8.1, 10, and 11 — 32 and 64-bit · from 2 GB of memory · 50 MB on disk · no internet needed

Details
Coming soon

Construct PDF is coming to Linux and Android

The same program, with the same features — for Russian operating systems and for a phone.

Linux

Astra Linux, RED OS and Alt Workstation. Editing, scans, electronic signature, and check before sending — everything in the Windows version.

In development

Android

For Android phones and tablets: editing, scans from the camera, conversion, compression, and signatures — everything the computer version does. The app will be available on RuStore and Google Play.

After Linux

Questions

Is it really free?+

Yes. Download it and use it with no sign-up, no trial period, and no watermarks.

Will a student find it useful?+

Yes. It is handy for assembling coursework from parts, numbering pages, compressing a file for a university student portal, recognizing text from a photo of a book, and marking up a study guide.

How do I update the program?+

Once a day the program checks whether a new version is out and offers to install it. Documents and settings stay in place when you update. You can turn the check off in settings.

Does the program collect data about my documents?+

No. Documents are opened, recognized, and signed on your computer and are not sent anywhere. Internet is needed only to check for updates (you can turn that off in settings) and to send an error report if you press the button yourself. More is on the “Privacy”.

What do I need to sign documents with an electronic signature?+

CryptoPro CSP installed, and your electronic signature certificate. The GOST signature is created via CryptoPro CSP. Everything else still works without them, including an image signature.

What does the computer need?+

Windows 7 SP1, 8.1, 10, or 11, 32 or 64-bit. One installer for every version. Linux and Android versions are in progress.