Aurora PDF · PDF tool for Windows
Aurora PDF merges, splits, compresses and edits pages; truly removes personal information from the file, adds passwords, recognises text and signs electronically. Everything happens on this computer and your file is never uploaded to a server. The original is never overwritten; the result is saved beside it under a new name.
Three promises
PDFs hold contracts, invoices, IDs and applications. So Aurora PDF first tells you where it runs and what it does not touch.
Every operation, including merging, compressing, redaction, OCR, passwords and e-signing, runs on this computer. The only place the program reaches the internet is licence verification; if you turn on timestamping for e-signatures, only the signature's digest goes to the timestamp server.
The result is always saved under a new name (for example "Name (düzenlendi).pdf"); the program cannot overwrite the original file. In the acceptance run, the SHA-256 of the six sample files stayed the same after the operations.
After redaction the file is reopened, the redacted text is searched for in the file, and the streams are unpacked and the raw bytes scanned; if anything is still found, the file is not saved. Every output is reopened and checked.
How it looks
You pick a tool on the left; on the right come that tool's settings and an Apply and save button. The screens below are example views of the program's real English interface, taken in a rehearsal environment with test documents; the documents, names and numbers are sample data.
What it can do
Features with a Beta badge were coded and tested in a test environment but have not yet been fully tried in real conditions: e-signing with a smart card, live timestamping and Office with a normal installation. Which features are free and which need a licence is in the Free use section.
Opens PDFs, draws pages, and asks for the password on a protected file. Several documents can stay open at once; thumbnails are drawn in groups.
Combines several PDFs into one file; splits by page range or each page into its own file; reorders, rotates and removes pages and adds blank pages. Nested bookmarks are carried to the new page order when merging and splitting; if you like, a top-level bookmark with the file name is added for each file.
Light does lossless compression only. At Balanced (150 dpi) and High (100 dpi) large images are downsampled; masked, CMYK and scanned black-and-white images are left alone. Before and after sizes are shown; if the result did not get smaller, no file is written.
Turns JPG and PNG pictures into PDF (JPEGs are not re-encoded); saves each page as PNG or JPG at 150, 300 or 600 dpi.
Adds page numbers as a footer or a watermark such as "DRAFT"; Turkish characters print correctly and text stays upright on rotated pages.
Adds an invisible text layer to scanned pages with Windows' own OCR; the picture does not change, and the text becomes searchable and selectable. Pages that already have text are skipped; the language is chosen in Settings.
Turkish ID numbers (with their check digits), IBANs, phone numbers and e-mail addresses are found automatically and listed to you first; you can also draw an area by hand. Text in the area is deleted from the file, the pixels in images are painted black, and letters outside the area are rewritten in the original font. A check is done after saving; a file that does not verify is not saved.
Adds a password with AES-256; removing a password works only with the correct password, there is no password cracking. Passwords never appear on a command line and are deleted as soon as the operation ends.
Fills in form fields (text, checkbox, list) and adds a signature image you draw or take from a photo. The signature image is stored encrypted on your computer and is not a legal e-signature.
Compares the text of two PDFs line by line and lists the numbers of additions, deletions and changes and the first 1000 differences.
Checks every signature in an incoming PDF: is it mathematically valid, is the certificate chain trusted, does the signature cover the whole document, did the content change after signing. Certificate revocation is not checked offline. It warns you before you edit a signed document.
Converts Word, Excel and PowerPoint files to PDF; it works if LibreOffice or Microsoft Office is installed on the computer, otherwise it says why the tool is off. LibreOffice is not bundled; it runs with a separate profile and a copied input and does not touch your own profile.
Signs with a certificate from the Windows certificate store or a PFX file; the original bytes stay as they are, the signature is written as an incremental update and earlier signatures are not broken. Windows or the card driver asks for the card PIN. It has not yet been tried with a real e-signature card.
Optional and off by default: if you turn it on, a timestamp (RFC 3161) is requested from a timestamp server for the signature, which needs the internet. It has not yet been tried with a live timestamp server.
The interface is available in 21 languages; Arabic and Urdu are shown right to left. The translations passed automatic checks and a back-translation check; review by native speakers is still under way.
Measured, written down
On 11 October 2026 an acceptance run was done on a real computer with administrator rights; every tool was also tried on realistic PDFs produced with LibreOffice and Edge. The personal information in the documents is made up; your real documents were not used.
| Tested | Result | How it was verified |
|---|---|---|
| Real redaction (8-page contract) | 2 ID numbers, 1 IBAN, 2 phone numbers and 2 e-mail addresses were found and redacted; 82 characters were rewritten in the original font | The file was reopened and the raw bytes scanned with qpdf: 0 findings left |
| Redaction on the acceptance-run document | The text left the file | Reopen and qpdf raw scan: 0 findings left, not found in the raw strings |
| Compression, PDF with photos (Balanced / High) | 7.4 MB → 3.7 MB (50%) / 3.4 MB (54%) | Page rendering difference was measured; where the result did not get smaller, no file was written |
| Add and remove a password | An AES-256 password was added; a wrong password was refused, the right one opened it | qpdf password check; no password files were left after the operation |
| Text recognition (OCR) | The text in a scanned invoice was recognised | Windows OCR; an invisible layer was added, the picture did not change |
| Office document to PDF (LibreOffice 26.8.1, an unpacked portable copy) | Word 8 pages, Excel 2 pages, PowerPoint 2 pages; Turkish text correct | The resulting PDFs were read with PDFium |
| E-signature (with a test certificate) | Signed; both signatures valid; with 1 byte changed the signature showed as broken | qpdf --check clean; independently checked with LibreOffice's own signature verification |
| Original files | None of the six files changed | SHA-256 values identical after the operations |
| A broken PDF and a foreign request | The broken file was refused and the panel stayed up; a foreign Host was refused | Error code and HTTP response |
| Unlicensed user edition | Redaction asked for a licence; a free tool worked | Error code LISANS_GEREKLI |
| Every tool on realistic PDFs | 132 of 132 steps done, 0 problematic | 6 PDFs and 3 Office documents; reopened and checked after every operation |
What we leave out on purpose
We leave out behaviours that are common in document tools but weaken your security.
Many online PDF tools upload your file to a server. Aurora PDF does not: the work happens on this computer, and there is no account or file-size limit.
For e-signing, Windows or the card driver asks for the PIN. Aurora PDF does not see, ask for or store the PIN; a PFX password is held in memory only during signing.
JavaScript embedded in PDFs, opening external links or running file attachments are never run; functions that run JavaScript or actions were never wired into the program.
Limits
Knowing what a document tool cannot do matters as much as knowing what it does. We say these up front:
Even with real redaction, before sharing an important document, open the result in another program and try selecting the text: we verify, but the decision is yours.
Free use and licence
Merging, splitting, page editing, compression, image conversions and signature checking are free; no watermark is added to outputs. A licence is needed for redaction, passwords, OCR, e-signing, Office conversion and other advanced tools. Aurora PDF is not sold separately: it comes with the Aurora One Licence.
For everyone
Free
Most everyday PDF jobs, without watermarks.
All programs, one licence
Unlock the advanced tools. The same licence covers every Aurora One program.
Aurora One Licence This program is covered by the Aurora One Licence: one licence for every Aurora One program.
See pricingSystem requirements
FAQ
No. Everything is done on this computer. The program reaches the internet for licence verification; if you turn on timestamping for e-signatures, only the signature's digest goes to the timestamp server. Nothing from your document is sent.
It deletes it. Text in the area is removed from the file, the pixels in images are painted black, and after saving the file is reopened and scanned at text and raw-byte level. If anything is still found, the file is not saved.
Still, before sharing a very important document we recommend opening the result in another program and trying to select the text.
No. The result is saved beside it under a new name such as "Name (düzenlendi).pdf"; if the name is taken, (2), (3) is added.
Aurora PDF writes the signature in the ETSI PAdES-B-B format, but its legal validity depends on the nature of the certificate; we do not give legal advice. This feature is Beta: we have not yet tried it with a real e-signature card.
The signature image in the form-filling feature is not a legal e-signature.
Aurora PDF sees the card certificate only from the Windows certificate store. You need to install the card's Windows driver (CSP or KSP), and the certificate must be published to the store when the card is inserted. Without a driver, the certificate list stays empty and signing cannot be done.
No; LibreOffice works too. If neither is installed on the computer, the tool is off and says why. Aurora PDF does not bring these programs with it.
Yes. Merging, splitting, page editing, compression, image conversions and signature checking are free, with no watermark on outputs.
Aurora PDF is not sold separately; it is used with the Aurora One Licence, which covers all Aurora One programs. Download and sales are not open yet.
Our other products
All of our products are designed for Windows and are local-first.
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