OneSigner 2026.10.11: Free Trial Inside the App, Trusted Timestamps and LTV, Acrobat-Valid Browser Signatures
OneSigner 2026.10.11 is out. It changes how the free trial starts, adds trusted timestamps and long-term validation to PDF signatures, and fixes a problem that made Adobe Acrobat reject signatures made in the browser. It is a free update; the Config app shows an update banner, or download it from Downloads.
1. Start the free trial inside the app
You no longer need a website account to try OneSigner. Download the installer from onesign.sg/portal/trial, install it, and the Config app opens with Start your free 30-day trial:
- enter your work email and name, then click Email me a code;
- type the 6-digit code from the email and click Activate.
The trial key is issued for that computer, applied straight away and emailed to you as well. Each computer and each email address get one trial, and reinstalling on the same computer with the same email gives you the same key back. The same dialog is on the License tab as Get free 30-day trial key; if you bought a licence, paste your key there as before.
2. Trusted timestamp and LTV for PDF signatures
PDF signing profiles get two new settings:
- Timestamp: an RFC 3161 timestamp server. When you pick a certificate the field is filled in with a server that suits its issuer; clear it to sign without one. With a timestamp the signature carries a trusted signing time instead of the clock of the signing PC, and it still validates after the certificate expires.
- LTV (long-term validation): after signing, OneSigner adds the OCSP/CRL revocation data of the whole certificate chain to the document, so the signature can be checked offline and years later. It needs internet access while signing; if the revocation data cannot be fetched, the signature is kept and the event is logged.
We also stopped writing empty Reason, Location and Contact entries into the signature, which Acrobat showed as blank lines, and the signature now names OneSigner as the signing application.
Tested on a real USB token: with a timestamp and LTV enabled, Adobe Acrobat Reader shows "Signed and all signatures are valid". An earlier document signed with the same certificate but without them showed "At least one signature has problems" in the same Acrobat.
3. Browser signatures now validate in Adobe Acrobat
Signatures made in the browser with your own token (the portal's Sign visually page and onesign.sg/sign) were cryptographically correct, but Adobe Acrobat reported "Signed by Unknown. Error during signature verification. Expected a dict object." The cause was the way the signature image was stored: Acrobat treats a signature appearance that contains an image directly as an old-style layered appearance and looks for a layer that was not there. The appearance now uses Acrobat's standard layered structure. We checked a single signature and two signatures added one after the other: Acrobat reads both, and earlier signatures stay valid.
Also new on onesign.sg
- onesign.sg/sign, the free page for signing a PDF with your own USB token, is now available in 15 languages: English, Vietnamese, Simplified and Traditional Chinese, Japanese, Korean, Thai, Indonesian, Malay, Filipino, Khmer, Lao, Burmese, Tamil and Hindi. It opens in English; pick another language at the top of the page.
- OneSignerBridge, the small Windows helper that lets a browser reach your token, is free for everyone and listed under Downloads.
How to update
Download OneSigner 2026.10.11 (signed by One Sign Pte. Ltd.). Existing settings are kept on upgrade. To use timestamps and LTV, open each PDF signing profile, check the Timestamp field and tick LTV, then save.