What is yasync?
A simple way to send large files: choose files, get a link, and share it. Recipients need no account or app.
FAQ
Frequently Asked Questions
Short, direct answers about sending, receiving, privacy, apps, and plans.
Jump to section
The Basics
What yasync is, how big transfers can be, and what recipients need.
How big can a transfer be?
Up to 5 GB without an account, or 50 GB with a Free account. Pro will support single files up to 5 TB and has no total transfer limit. Pro signup is coming soon.
How fast is it, really?
yasync is built to use your available connection and serves downloads through a worldwide network. Your actual speed still depends on your internet connection, device, and files.
Do recipients need an account or an app?
No. They open the link in a browser and download the files. Large transfers may need to be downloaded one file at a time.
Can I send whole folders?
Yes. Drop folders — nested files included — into the send box and the structure comes along.
Links, Expiry & Passwords
How long links live, and how you lock them down.
How long do links last?
Anonymous and Free links work for 24 hours. Pro links have no automatic expiry and stay live while the plan covers their storage.
Can I password-protect a transfer?
Yes, on every tier. Recipients must enter the password before they can see file names or download anything.
What happens when a link expires?
The link stops working. The files are permanently deleted within seven days.
How many times can a link be downloaded?
As many times as you like. Downloads are unlimited and free on every tier.
Can I see whether my files were downloaded?
With a Free or Pro account, yes — your transfer history shows download counts. Transfer notifications can also be sent when you provide delivery addresses.
Speed & Reliability
What makes transfers fast, and how we make sure they arrive intact.
Why is yasync fast?
Files take a short route to storage, and downloads use a worldwide network. Real speed still depends on both people’s connections, devices, and files.
How do I know my files arrived intact?
yasync checks each file before the link is ready. For supported downloads, the desktop app also checks the finished file and warns you if it does not match.
What happens if my connection drops mid-upload?
The web uploader retries while the page stays open. The desktop app can resume compatible transfers after connection changes and restarts.
When should I use the desktop app?
Use the browser for quick sends. Use the desktop app for folders, overnight work, unreliable connections, or transfers you may need to resume.
Apps, CLI, API & MCP
Ways to use yasync beyond the web uploader.
Is there a desktop app?
Yes. It can resume compatible uploads and downloads, send folders, and check supported downloads. Get it from the Apps page.
Which operating systems are supported?
Release targets are macOS 11 or later on Apple Silicon, Windows 10 or later on x86_64, and Linux x86_64 for Ubuntu/Debian and Rocky/RHEL. The PKG adds /usr/local/bin/yasync; NSIS and MSI manage their Windows PATH entries; DEB and RPM install /usr/bin/yasync. DMG and AppImage downloads are GUI-only; Flatpak exposes a sandboxed CLI. Standalone CLI archives include a local installer. The Apps page shows only packages in the current verified release manifest.
Can I script transfers — is there a CLI?
Yes. The yasync CLI can send, receive, list, and remove transfers. It requires Pro; the desktop app remains available on every tier.
Is there an API?
Yes, with Pro. Create an API key in your dashboard and follow the Developers guide.
Can an agent or production tool use MCP?
Yes, with Pro. MCP tools can create and manage transfers. Setup and the full tool list are on the Developers page.
Storage, Privacy & Ads
Who can access your files and how we use your data.
Where are my files stored?
Cloudflare stores and delivers transfer files for yasync. See our Compliance and Privacy pages for provider, location, and legal details.
Who can access my files?
Anyone with the download link can open the transfer. If you add a password, they must enter it before seeing file names. yasync and its listed providers process files only to run the service, meet legal duties, or investigate a specific report.
Will the free tiers show ads?
There are no ads today. Free pages may show consent-based ads later, but never based on file contents. Pro will stay ad-free.
Do you look at the files people send?
We process file content to store and deliver it, but we do not scan transfers for advertising, profiling, or AI training. If somebody reports a specific transfer for abuse or illegality, an authorised person may review that report and the affected transfer.
Do you train AI on my files?
No AI training, period. Your files never train machine-learning models — ours or anyone else’s. This applies to every tier, including Free and Anonymous, with no fine-print exceptions.
Do you sell or share my data?
We never sell personal data. We share only what is needed with the providers that run yasync or when the law requires it. The Privacy and Compliance pages list those providers and purposes.
Pro & Custom Branding
The planned €39.99/month plan. Pro signup is coming soon.
What can I customize?
Your logo, your colors, your background, and your sender identity on the download pages your clients see — yasync branding steps out of the way. It looks like your delivery system, not a file-sharing site.
How does Pro storage billing work?
The planned price is €39.99/month with 1 TB included. Extra storage is €7 per 100 GB/month, charged only for the days you use it. Holding 100 GB extra for one day would cost about €0.23. Checkout is not available yet.
Can I cap my Pro bill?
Yes. Turn off automatic extra storage so uploads stop at your limit. Optional 1 TB packs cost €39.99/month, but the hard limit comes from turning automatic storage off. These controls will be available when Pro launches.
Do Pro links really never expire?
The planned Pro model has no automatic expiry date: links stay live while the plan covers their storage and can be deleted from the dashboard. Public Pro signup is coming soon.
Can I cancel anytime?
The planned flow lets you cancel and keep Pro until the end of the paid month. Checkout is not available yet.
Abuse & Reporting
What is not allowed, and how to report it.
What am I not allowed to send?
Anything illegal or infringing, including malware, content you have no right to share, and material that harms others. See the Terms for the full rules.
How do I report an abusive transfer?
Use the report form with the link and a short explanation. You will get a case ID. Email updates are not available yet.
I received a link I don’t trust. What should I do?
Don’t download it. Files on yasync are user-uploaded, and a link from a stranger deserves the same caution as an email attachment from one. If it looks like phishing or malware, submit the link through the report form.
Something we didn’t cover? The developer docs go deeper. For a suspicious transfer, use the report form and keep the case ID it returns.