Seal Any File Format. Prove Your Ownership.
Swiss Trust Layer applies a qualified electronic timestamp to any digital file: document, video, audio, image, source code, CAD drawing, or binary. One platform covers every creative and technical format.
Supported File Formats
The list below is a guide. If it can be uploaded, it can be sealed.
- DOCX
- XLSX
- PPTX
- ODT
- TXT
- RTF
- ZIP
- RAR
- TAR
- GZ
- 7Z
- DWG
- DXF
- IFC
- RVT
- SKP
- MP3
- WAV
- FLAC
- AAC
- OGG
- MP4
- MOV
- AVI
- MKV
- WebM
- JPG
- PNG
- SVG
- TIFF
- WebP
- JS
- TS
- PY
- JAVA
- Any source
- Any binary file up to 500 MB
If it can be uploaded, it can be sealed.
How It Works: Any File, Same Process
Upload your file
Select any file up to 500 MB. Documents, video, audio, images, source code, archives, CAD files: all accepted.
SHA-256 fingerprint computed
A unique cryptographic hash is calculated from the file's exact binary contents. Your file is never stored or transmitted, only the fingerprint.
Qualified timestamp issued
Swisscom Trust Services, a ZertES-accredited and eIDAS-qualified QTSP, anchors the hash to a certified point in time.
Receive your certificate
A PAdES-compliant certificate is issued: hash, timestamp, issuer chain, and your identity. Self-contained proof of creation.
Verify publicly
Anyone can confirm your seal at /validate. No account, no login, no request to you needed.
Legal Framework
Every seal is backed by two independent legal frameworks, Swiss and EU, via Swisscom Trust Services.
Qualified electronic timestamps carry a legal presumption: the time is accurate and the data is unchanged. The challenger must disprove it.
Same legal presumption under Swiss law. Admissible in Swiss courts and proceedings without further authentication.
Copyright exists at creation. No registration needed. A qualified timestamp proves when that creation occurred.
Who Seals What
Video creators
Seal MP4 and MOV files before uploading to YouTube, TikTok, or Vimeo. Platform upload strips EXIF, but your seal survives.
Guide: sealing video files →Developers & startups
Seal source code or a ZIP of your full repository before investor demos, open-source releases, or contractor handoffs.
Guide: sealing source code →Photographers & designers
Seal JPG, PNG, and SVG files before posting to Behance, Instagram, or client portals. AI scrapers cannot predate a sealed timestamp.
Guide: sealing image files →Architects & engineers
Seal DWG, IFC, and RVT files before external contractor sharing. Every design stage sealed = a court-admissible version chain.
Architecture IP protection →Musicians & producers
Seal WAV, FLAC, and MP3 stems before sending to labels or collaborators. Establishes prior art against AI voice cloning.
Music copyright sealing →Legal & compliance
Seal contract drafts, evidence documents, and compliance records. PAdES-grade certificate accepted in Swiss and EU courts.
ZertES legal framework →Frequently Asked Questions
What file formats can be sealed for copyright?
Any digital file up to 500 MB. Documents, video, audio, images, source code, archives, CAD and BIM files, and any other binary file. The seal operates on the SHA-256 hash of the file, so format is irrelevant.
Does sealing a file prove I own the copyright?
A seal proves that a specific file existed in its exact form at a specific certified time. Under the Berne Convention, copyright attaches at creation, and the seal provides the evidence of when that creation occurred. It does not assert originality, but it establishes your prior art with the strongest available evidentiary standard.
Is my file uploaded or stored when I seal it?
No. Only the SHA-256 hash of the file is processed. Your file never leaves your device and is never stored on Swiss Trust Layer servers. The hash alone is submitted to Swisscom Trust Services for timestamping.
What is the file size limit?
500 MB per seal. For larger files, compress or export at the highest quality that fits the limit, or seal at the project archive level. The hash uniquely identifies whatever file is submitted.
How is this different from a DocuSign or Adobe Sign signature?
DocuSign and Adobe Sign are designed for signing documents, primarily PDFs, in a workflow context. Swiss Trust Layer seals any digital file with a cryptographic timestamp that proves what existed and when, independent of any signing workflow. It is proof of creation, not a signing service. See the [full comparison](/smi-vs-docusign).
Any File. Two Minutes. Legal Proof.
Seal your file before you share it. Pricing starts at CHF 5 per year.