Website Review
What is SendBig?
SendBig is a web-based file-transfer service built for sending very large files without installing desktop software. According to its own homepage, it lets you upload files, photos and videos up to 30GB for free, then deliver them by email or a shareable link that can also be posted to a blog or social media. The recipient does not need an account to download; you simply choose a file or folder, add the recipient's email and an optional message, and send.
What it does well
- Large single transfers. A 30GB ceiling covers jobs that ordinary email attachments and many free tiers cannot handle, such as raw video footage, design archives or research datasets.
- Resumable uploads. The site states that logged-in users can start an upload, switch off the computer and resume later from the point where it stopped. Incomplete uploads reappear in the upload card for you to continue. This matters on unstable connections or when a laptop battery runs out mid-transfer.
- Security options. Files are described as encrypted in transit and at rest with AES-256, transfers use SSL/TLS, and servers are said to be ISO 27001 certified. You can add password protection, set an expiry date and cap the number of downloads. Files are automatically deleted once a transfer expires.
- Multilingual interface. The upload page is available in English, French, Arabic, Spanish and Italian.
Trade-offs to weigh
| Consideration | What it means in practice |
|---|---|
| Free tier vs PRO | Resumable uploads are described as a free PRO feature, so check the current plan conditions before relying on them for a critical transfer. |
| Expiry and download limits | Security features double as constraints: a short expiry or low download cap can lock out a recipient who is slow to open the link. |
| Password sharing | End-to-end protection only works if you send the password through a separate channel, such as a phone call or messaging app, never in the same email as the link. |
| No account for recipients | Convenient, but it also means anyone holding the link and password can download, so treat the link itself as sensitive. |
A practical example
A freelance video editor finishing a 12GB project for a client on hotel Wi-Fi can start the upload, lose the connection, and resume the next morning rather than restarting from zero. She sets a seven-day expiry, adds a password, and texts the password separately. The client downloads without signing up.
Next step
Before uploading anything confidential, open the site's FAQ and PRO pages to confirm the current limits, expiry options and whether resumable uploads require a paid plan. For everyday small documents, a simpler transfer tool is usually less effort; SendBig makes sense when size, resumability or access controls are the deciding factors.
How does SendBig's resumable upload feature work?
SendBig's resumable upload feature is designed to let you stop a large upload partway through and continue it later without starting over. According to the site's own FAQ, the process works like this: when you are logged in and begin an upload, any incomplete uploads are retrieved and shown first inside the upload card. For each incomplete upload, you select the corresponding file on your computer and click resume, and the upload continues from where it previously stopped.
The practical benefit is aimed at people on unstable connections or limited time. Instead of needing one uninterrupted session, you can start an upload today, shut down your PC, and finish tomorrow. This matters most for very large files such as videos, where a dropped connection or a laptop running out of battery would otherwise mean re-uploading everything.
A few things to keep in mind:
- The site ties resumable uploads to being logged in and describes it as introduced for free PRO users, so the feature may not apply to anonymous uploads.
- Resuming appears to require you to reselect the local file, so keep the original file in the same place and unmodified; changing or moving it could break the resume.
- The feature addresses upload interruptions, not storage or expiry: files are still deleted from the servers once the transfer expires, per the FAQ.
As a next step, if you regularly send multi-gigabyte videos over a flaky connection, test the resume flow once with a smaller file before relying on it for something time-critical. If your main need is simply a one-off link for a modest file, a simpler transfer service may be less setup than logging in and managing incomplete uploads. Among alternatives, WeTransfer and Dropbox are well-known for file sharing, though their resumable behavior and limits differ from SendBig's described approach.
Is SendBig secure for transferring sensitive files?
Yes, with caveats. SendBig describes several security controls that matter for sensitive transfers, but "secure" depends on how you configure each transfer and what kind of data you're moving.
What the service says it does
- Files are encrypted in transit and at rest using AES-256, with SSL/TLS protecting data transfer.
- Servers are described as ISO 27001 certified, and a dedicated 24/7 security and support team is mentioned.
- Files are automatically deleted from servers once a transfer expires.
- You can add password protection (described as end-to-end encryption) so only the recipient knows the password.
- You can set an expiry date and a maximum number of downloads per transfer.
Where the trade-offs sit
The default free transfer is convenient but relies on SendBig's own encryption and access controls. The stronger protections — password protection, expiry limits, download caps — are optional settings, so a "secure" transfer really means one where you turned those on. Password protection is the single most valuable step for sensitive files, because it means an intercepted link alone isn't enough to open the content.
Resumable uploads are a practical plus: if your connection drops mid-upload, you can log in later and continue where it stopped rather than starting over. That reduces the temptation to fall back on less careful methods when a large transfer fails.
Practical scenario
Suppose you're sending a signed contract or a folder of client videos to someone outside your organisation. Upload the files, set a short expiry (days, not weeks), cap the downloads at one or two, and enable password protection. Send the link by email but pass the password through a separate channel — a phone call or a different messaging app. That way, even if the email is forwarded or the link leaks, the files stay closed.
Decision criteria
- For routine, non-confidential large files: the standard free transfer is fine.
- For anything sensitive: always enable password protection plus a short expiry and a download limit.
- For regulated data (health, financial, legal): check your organisation's policies first; a consumer file-transfer service may not be approved regardless of its encryption claims, and you may need a tool your IT team manages.
Useful next step
Before uploading, decide three things: who should be able to open the file, how long the link should live, and how the recipient will get the password. If you can't answer all three, the transfer isn't ready to send. For an alternative with a strong privacy reputation, you could compare Send Big files with WeTransfer or Proton's file-sharing tools.
What are the differences between SendBig's free and PRO plans?
SendBig's free plan already covers the core job: sending files up to 30GB, with resumable uploads and security features that apply to both tiers. PRO is less about lifting the size limit and more about convenience, branding and control.
Where the two plans differ
| Aspect | Free | PRO |
|---|---|---|
| Max file size | Up to 30GB | Same headline limit of up to 30GB |
| Resumable uploads | Described as available to free PRO users | Included |
| Security | AES-256 encryption at rest and in transit, SSL/TLS, ISO 27001-certified servers, optional password protection, expiry dates and download limits | Same security stack |
| Practical extras | Core sending by email, link, blog or social media | Longer expiry dates and additional features aimed at heavier or more polished use |
SendBig's own description of resumable uploads is the clearest practical difference: you can log in, start an upload, shut down your computer, and resume the same transfer later from where it stopped. Incomplete uploads appear at the top of your upload card when you return. That matters most for people on unstable connections or sending multi-gigabyte video files.
Who should pick which
- Occasional senders — a contract, a batch of photos, a single video — can stay on the free tier. The size ceiling and encryption are the same, so there is no security penalty for not paying.
- Frequent or professional senders who need transfers to stay live longer, or who want the extra control that comes with a paid tier, are the natural PRO audience.
Next step
If you regularly send files near the 30GB mark, test the free tier first with one real transfer and note how long the link stays valid and whether the recipient finds it easy to download. If those limits get in your way, that is your signal to look at PRO. For an alternative with a different free-size ceiling, see WeTransfer.
How do I send large files using SendBig?
You send a large file on SendBig by uploading it through the browser, entering the recipient's email address, and letting the service generate a download notification or shareable link. The site supports transfers up to 30GB, according to the page evidence, and it advertises resumable uploads for logged-in users, which is the feature worth understanding before you start.
The basic workflow
- Open the site and choose "Choose a file" or drag files and folders into the upload card. The page shows a running total, so you can confirm the size before continuing.
- Enter your email and the recipient's email, add an optional message, then proceed. You can also share via a link rather than email if that suits the recipient.
- If you are logged in and the upload is interrupted, the incomplete transfer appears in the upload card when you return. Reselect the same file on your computer and resume; the upload continues from where it stopped.
Why the resumable part matters
The page's own explanation is that logged-in users can start an upload, shut down the computer, and finish the next day. In practice this is the difference between a workable and an unworkable transfer for anyone on a slow or unstable connection. A 15GB video export over home broadband can take hours; without resumability, one dropped connection means starting over. With it, the cost of an interruption is a few minutes, not the whole upload.
The trade-off is that resuming depends on logging in and reselecting the identical file. If you rename or move it between sessions, expect to start again. For very large transfers, keep the file in one place until the upload completes.
Security and expiry choices
The page states files are encrypted in transit and at rest using AES-256, that transfers use SSL/TLS, and that servers are ISO 27001 certified. It also says files are deleted once a transfer expires. You can add password protection for an extra layer, and you can set an expiry date and a maximum number of downloads.
For sensitive material, set both a password and a short expiry, and send the password through a separate channel such as a phone call or messaging app rather than in the same email. Treat the expiry setting as your real cleanup mechanism, since deletion is tied to it.
A concrete scenario
Suppose you are a video editor delivering a 12GB project file to a client. Upload overnight with your account logged in, set a seven-day expiry and a download limit of three, and password-protect it. Email the link, then text the password. If your connection drops at 80%, log back in the next morning, reselect the file, and resume rather than re-uploading.
When to choose something else
SendBig fits one-off large transfers where you want email delivery or a link without installing anything. If you and your recipient need ongoing shared folders, version history and collaborative editing, a cloud storage service is a better fit; Dropbox and Google Drive are the common choices. If your priority is a polished, widely recognised transfer interface, WeTransfer is the best-known alternative. For very large or repeated sends, compare each service's size limit and expiry policy against your actual file sizes before committing.
Next step
Before uploading anything important, sign in first so resumable uploads are available, then set the expiry date and download limit while you are still on the upload screen. That single habit prevents most of the frustration people hit with large transfers.
How long do files remain available on SendBig before they are deleted?
SendBig does not state one fixed retention period for every transfer. According to its FAQ, files are automatically deleted from the servers once the transfer has expired, and you can choose the expiry date when you set up the transfer. So the practical answer is: availability is tied to the expiry you select, not a single universal countdown.
If you need a file to stay available for a specific window, set the expiry date deliberately before uploading rather than relying on a default. If you want tighter control, SendBig also says you can limit the maximum number of downloads per transfer, which can make a link stop being useful sooner than the expiry date.
A concrete scenario: a videographer sending a 20GB rough cut to a client who may not download it for several days should choose an expiry that covers the client's realistic review time. A recruiter sending a portfolio to one hiring manager, by contrast, can use a shorter expiry and a download limit because the file only needs to reach one person.
For comparison, other transfer services often publish their own retention rules, so if a fixed retention window matters more than a configurable one, check the official policy of alternatives such as WeTransfer or Dropbox. The key decision criterion is whether you need a guaranteed minimum availability period or flexible control over when the link dies.
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