TL;DR: An original PDF is the PDF file exactly as its issuer created it, and a true PDF is a PDF made directly by software rather than scanned from paper. Neither one proves where it came from: every copy of a PDF is identical to the first, and an unsigned PDF can be edited with ordinary software. A TRUE Original document is issued as a page, which can open on the issuer's own domain, with its fingerprint recorded on a public blockchain, so anyone can check from a link or a QR code that it is the original and unchanged.
An original PDF is the PDF file as its issuer first created it, usually exported from Word, a design program or a business system, before anyone copied, scanned or edited it. Every copy of that file is identical to the first, so nothing inside an original PDF marks it as the original. A file called original.pdf is a file with a name, and anyone can rename any file.
Johannes Gutenberg's printing press in the 1450s made mass distribution of documents possible, a revolution at the time. Paper had a tell. The original was the sheet with the ink signature and the embossed seal, and a photocopy looked like a photocopy. A PDF has no such tell. The copy in a recruiter's inbox, the copy on the graduate's laptop and a copy that someone opened, changed and saved again can look exactly alike on screen.
So when people search for the original PDF of a certificate or a contract, they are usually asking a harder question. Is this file the one the issuer sent, and has anyone changed it since? The file cannot answer that on its own.
A true PDF is a PDF created directly by software, such as Word, Excel or a print-to-PDF function, so the text inside it is real, selectable text rather than a picture of a page. The opposite is a scanned or image-only PDF, made by a scanner or a phone camera. Printers, publishers and archives ask for true PDFs because the text stays sharp, searchable and exact.
ABBYY, the company behind the FineReader PDF software, sorts PDFs into three types by how the file was born. A digitally created PDF, which ABBYY also calls a "true" PDF, comes straight from software and stores every character as text. An image-only PDF holds photographs of pages with no text layer underneath, so it cannot be searched. A searchable PDF is a scan that OCR software has given a hidden text layer, placed under the image.
Publishers use other words for the first type. JSTOR, the journal archive, calls it a "born digital" or "native" PDF and tells journal publishers: "Please only submit native PDFs."
Lawyers know the same file as a text-based PDF. The National Litigation Support Blog, written for US federal defenders, files it under "True PDFs (also known as text-based or digitally created PDFs)". Its example is a pleading drafted in Word and filed in the federal courts' CM/ECF system, which the author calls "the best type of PDF to receive in discovery".
A true PDF is the best kind of PDF to read, search and print. It is also the easiest kind to change. ABBYY's guide says that in a digitally created PDF you can "select, edit or delete text similar to how you would do that in other editable formats such as Microsoft® Word®." The word "true" describes how the file was made. It says nothing about whether the content is genuine.
"True PDF" is a printing and publishing term. It has no connection to TRUE Original, the Swedish company that publishes this article and issues verifiable documents.
| Type | Also called | How it is made | Searchable text | Shows who issued it |
|---|---|---|---|---|
| True PDF | Digitally created, native, born digital or text-based PDF | Exported from Word, Excel or a print-to-PDF function | Yes, every character is text | No |
| Image-only PDF | Scanned PDF | A scanner or a phone camera photographs the pages | No | No |
| Searchable PDF | OCR PDF | A scan that OCR software gives a hidden text layer | Yes, as accurate as the OCR | No |
| TRUE Original document | Verifiable original | Issued through TRUE Original as a web page, with its fingerprint recorded on a public blockchain | Not a PDF file | Yes, in TRUE Verify |
None of the three PDF types shows who issued the file. A TRUE Original document does, and anyone can check one free in TRUE Verify without an account.
No, a PDF is not the same as a document: a document is the content itself, such as a diploma, a contract or a letter, while PDF is one file format for storing and showing that content. The same diploma can exist as a sheet of paper, a Word file, a PDF and a web page. EU law defines an electronic document as "any content stored in electronic form, in particular text or sound, visual or audiovisual recording" (eIDAS Regulation, Article 3).
What sets PDF apart from a Word document is its purpose. Adobe launched PDF in 1993, and the format is now the international standard ISO 32000. The 2020 edition, ISO 32000-2, runs to 986 pages and says the format exists "to enable users to exchange and view electronic documents independent of the environment in which they were created or the environment in which they are viewed or printed." A PDF looks the same on every screen and every printer. That is why organisations send diplomas, invoices and contracts as PDFs.
Fixed layout is not fixed content. The same ISO abstract describes software that reads a PDF and lets the user "possibly modify and save the PDF file". The standard expects PDFs to be edited.
Legally, PDFs are often accepted as copies, not originals. In law the line is looser than it sounds. Under US Federal Rule of Evidence 1001(d), any printout or screen view of electronically stored information counts as an "original" if it accurately reflects the information.
A digital copy of a document is a reproduction made by scanning, photographing or converting it. Rule 1001(e) calls this a duplicate: a counterpart made by "a mechanical, photographic, chemical, electronic, or other equivalent process or technique that accurately reproduces the original." The next rule treats duplicates almost as well as originals.
"A duplicate is admissible to the same extent as the original unless a genuine question is raised about the original’s authenticity or the circumstances make it unfair to admit the duplicate." (US Federal Rules of Evidence, Rule 1003)
European law says the same about format. Article 46 of the eIDAS Regulation reads: "An electronic document shall not be denied legal effect and admissibility as evidence in legal proceedings solely on the grounds that it is in electronic form." TRUE Original is eIDAS compliant.
A PDF is a valid document, then. The weak spot sits in the condition of Rule 1003. Once someone raises a genuine question about authenticity, the person relying on the PDF has to show that it is genuine. With an ordinary PDF, that usually means writing to the issuer and waiting.
Yes, an unsigned PDF can be edited after it is sent, with Adobe Acrobat, other PDF editors or Microsoft Word, and the edited file looks as clean as the first one. PDFs can be edited with free software in under five minutes. The PDF Association wrote in 2018 that PDFs without encryption or a digital signature "are entirely editable; no conversion to Word or programming skills required." A digital signature is the exception: a signed PDF that is changed afterwards fails signature validation.
Microsoft's own instructions for Word describe the route. Open a PDF in Word and, in Microsoft's words, Word will "make a copy of the PDF and convert its contents into a format that Word can display." After the edits, "you save it as a Word doc or a PDF."
Real example: In the indictment of Paul Manafort (former campaign manager for Donald Trump), the Justice Department detailed how Manafort and an associate manipulated a PDF by converting it to Word, changing it, and converting it back, attempting to pass it off as an original document. According to the superseding indictment filed in February 2018, on or about October 21, 2016, Manafort emailed his associate Rick Gates a PDF of his firm's real profit and loss statement, which "showed a loss of more than $600,000." Gates converted the PDF into a Word document. Manafort added more than $3.5 million in income. Gates converted the file back to PDF, and the falsified statement went to a lender. Manafort was convicted and sentenced to prison.
The PDF Association's comment on the case was dry: "Manafort could have readily altered the PDF himself." Edited directly in a PDF editor, it wrote, a change comes out "with little or no loss in fidelity compared to the original document."
Documents are where fraud hides. In the ACFE's Occupational Fraud 2024: A Report to the Nations, based on 1,921 cases, fraudsters created fraudulent electronic documents or files in 31% of cases and altered electronic documents or files in 28%. The same ACFE 2024 report found fraudulent physical documents created in 41% of cases and physical documents altered in 37%.
The alternatives that hold up are checked against a record outside the file: a document anchored on a public blockchain, a W3C Verifiable Credential signed by the issuer, or a PDF sealed with an eIDAS qualified electronic seal. TRUE Original issues certificates as pages on the issuer's own domain, each anchored on a public blockchain, and can add an eIDAS qualified electronic seal to diplomas that need legal standing in the EU. Berghs School of Communication issues its diplomas this way straight from Salesforce, and anyone can check one in TRUE Verify.
Paper, PDF and a TRUE Original document differ most in who can check that the document is genuine. A paper certificate or an unsigned PDF can be confirmed only by asking the issuer. A TRUE Original document can be checked by anyone, from its link or its QR code, against a record on a public blockchain.
| Feature | Paper | TRUE Original document | |
|---|---|---|---|
| What the holder has | A printed sheet, perhaps signed or stamped | A file, identical in every copy | A link to the document on the issuer's domain, plus a PDF download and a printable copy |
| Can the content be changed? | Yes, by altering or reprinting a copy | Yes, with PDF editors or Word, unless it is digitally signed | No, a change no longer matches the blockchain record |
| Who can verify it? | The issuer, by phone or email | The issuer; a digital signature, if there is one, can be validated | Anyone, by link, QR code or TRUE Verify |
| Verification speed | Hours to days | Hours to days | Seconds |
| Can it be lost? | Yes | Yes, with the email or the drive | The document stays online at its link |
| Shareable online? | Only as a scan | Yes, as an attachment | Yes, as a link, including on LinkedIn |
| Analytics for the issuer | No | No | Yes: opens, shares and views |
| Where the brand lives | Letterhead | Letterhead inside the file | The document page, which can sit on the issuer's own domain |
| Environmental impact | Paper, ink, shipping | Digital (low) | Digital (low) |
| Cost per verification | High (staff time) | High (staff time) | Near zero (automated) |
A paper diploma's weakness shows the moment it leaves the room. A scan of a paper diploma is a digital copy, and the seal and the watermark stay behind on the original sheet.
You verify that a document is the original by checking it against something a forger cannot control: the issuer's records, a digital signature or a blockchain record. For a paper certificate or an unsigned PDF, that means contacting the issuer. For a TRUE Original document, it means opening the document's link, scanning its QR code, or pasting the link, the document ID or the PDF into TRUE Verify, which is free and needs no account.
Contact the issuing organisation by phone or email, give the document number or the holder's name, and wait for confirmation (typically 2 to 14 days). The check works only while the issuer exists and keeps its records.
If the PDF carries a digital signature, validate it. TRUE Verify reads the PKCS#7 and CAdES signatures embedded in PDFs and shows the signer, the certificate authority and the signing time. Digital signatures add a layer of security, but they can be stripped, the signing certificate can expire, and many recipients don't know how to verify them. If the PDF has no signature, the file cannot vouch for itself and the issuer is the only check left. PDF metadata does not settle it, because metadata can be stripped or rewritten.
A PDF that already exists, such as a signed agreement, can be made provable from today on. TRUE Vault records the file's fingerprint on a public blockchain, and from that moment anyone can prove that the file has not changed.
Click the verify button next to the document on the web, or scan the QR code on a printed copy with any phone camera. No app is needed. The check compares the document with its record on the blockchain and shows whether it is genuine or has been tampered with. It works forever, even if the issuing organisation ceases to exist. Reliability: Near-absolute. For organisations that need to detect and prevent document fraud, blockchain verification eliminates the guesswork entirely.
A blockchain makes a document tamper-proof by keeping a fingerprint of the document in a public ledger that no single company controls, so any later change to the document no longer matches the record. TRUE Original records these fingerprints on the Ethereum, Avalanche (AVAX), Fantom and Polygon blockchains.
Every document gets a unique digital fingerprint: a 64-character hash generated from its exact contents. Change one comma and the hash changes completely. The fingerprint has the same length whether the file holds one page or five hundred. The hash ties the record to the exact content. The public ledger keeps that record out of reach of the issuer, the holder and TRUE. To tamper with a record, an attacker would need to simultaneously alter copies across thousands of independent nodes: computationally impossible. The verification link lets a stranger run the comparison in seconds.
A digital signature and a blockchain record do different jobs, and one document can carry both. TRUE's article on whether blockchain timestamps are eIDAS qualified timestamps explains where each one fits, and the guide to making a document tamper-proof walks through the options.
Any document that a stranger will rely on should be issued as a verifiable original: diplomas, course certificates, professional licences, memberships and certificates of authenticity for products. Internal memos, meeting notes and drafts work well as paper or PDF, because nobody outside the organisation has to trust them. Blockchain-verified documents are increasingly accepted across legal, regulatory, and employment contexts worldwide. If someone may one day need to prove that the document is real, issue it so that it can prove itself.
Recruiters meet the question when a candidate sends a diploma, and TRUE's guide explains how to check if a certificate is fake or real. Fake credentials are a growing problem; blockchain verification eliminates the risk. Licensing bodies meet it whenever a licence is checked by someone outside the body, which is the subject of why PDFs fail as professional licences. Brands meet it with certificates of authenticity, covered under product certification. Counterfeit certificates are a billion-dollar problem. The organisations issuing documents through TRUE Original include educational institutions, training providers, professional associations, certification bodies and brands.
A TRUE Original document is a diploma, certificate, licence or other document issued with TRUE. It is a true original, published online on the issuer's web page, with its fingerprint recorded on a public blockchain. The recipient gets a link instead of an attachment, and can still download the document as a PDF or print it on paper. Every copy, on screen or on paper, leads back to the original through its link or QR code, where anyone can check it.
Issuers create and send TRUE Original documents from the TRUE dashboard, through a REST API with five endpoints, or from systems they already use, such as Canvas LMS, Moodle, Learnster and Salesforce. Each document carries the issuer's design and lives on the issuer's domain. The issuer sees when documents are opened and shared. Recipients add them to LinkedIn in a few clicks. TRUE tailors the price to each organisation: plans start from €100 a month on a yearly contract, with no large upfront platform fee, and above 8,000 documents a year TRUE can price per document. For most organisations, the cost is comparable to or less than the staff time currently spent on manual verification of paper and PDF credentials.
TRUE Original co-founder Patrik Slettman puts the idea in four sentences: "AI has made it easy to fake a document. So we built documents that cannot be forged. Nobody has to take our word for it. The document proves itself."
TRUE Original has issued over 900,000 documents for more than 200 issuers, with customers in over 15 countries. Organisations that issue diplomas, certificates or licences can book a demo and see their own document as a TRUE Original. Each of those 900,000 documents can be checked by anyone with a phone camera.
A true PDF is a PDF created directly by software, such as Word, Excel or a print-to-PDF function, so its text is real, selectable text rather than a picture of a page. The opposite is a scanned or image-only PDF. A true PDF tells you how the file was made, not whether its content is genuine, and it is easy to edit.
Legally, PDFs are often accepted as copies, not originals. Under US Federal Rule of Evidence 1001(d), a printout or screen view of electronically stored information counts as an original if it accurately reflects the information, and Article 46 of the EU eIDAS Regulation bars rejecting an electronic document as evidence solely because it is electronic. When someone questions its authenticity, an unsigned PDF has to be confirmed by the issuer.
No. A document is the content, such as a diploma or a contract, and PDF is one file format for storing it, standardised as ISO 32000. The same document can exist on paper, as a Word file, as a PDF or as a web page.
Yes. An unsigned PDF can be edited with Adobe Acrobat, other PDF editors or Microsoft Word, and the PDF Association calls PDFs without a digital signature "entirely editable". A signed PDF that is changed afterwards fails signature validation.
A digital signature makes a PDF tamper-evident: validating the signature shows whether the content changed after signing, and TRUE Verify reads signatures embedded in PDFs. The signature does not survive printing or a screenshot. A TRUE Original document adds a blockchain record that anyone can check from its link or QR code.
For paper or an unsigned PDF, contact the issuer. For a TRUE Original document, scan the QR code, open the link, or paste the link, document ID or PDF into TRUE Verify, which is free and needs no account.
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