How MEGA Shared-Link Encryption Works: The Meaning of the # and Decryption Key
At first glance, a MEGA public link looks like another long web address. Technically, however, the portion associated with the # plays an important role in separating information used to locate encrypted content from key material handled by the client.
The surprising part is that information placed in a URL fragment—the portion after #—is normally handled locally by the browser rather than being included in the HTTP request sent to the web server.
MEGA has historically used this property as part of its public-link architecture. Its security documentation describes public links containing information sufficient for the client to locate encrypted content and decrypt it, while noting that information after the anchor hash remains local to the browser rather than being sent to MEGA's servers as part of that URL request.
Why Encrypted Files Need Keys
Encryption transforms readable information into data that cannot ordinarily be interpreted without the appropriate cryptographic information.
MEGA's design separates encrypted cloud data from the key material required by an authorized client to make that data readable.
Without both pieces, locating encrypted bytes and turning them back into useful content are different problems.
Anatomy of a MEGA Public Link
A modern plaintext MEGA file link can conceptually be represented as a MEGA file path containing a public handle followed by # and encoded key material.
The important conceptual distinction is between identifying remote encrypted data and possessing the cryptographic material needed to interpret it.
The # Is Called a Fragment Identifier
Web developers commonly encounter fragments in links that jump to a particular section of a page, but client-side applications can use fragments for other purposes.
Suppose a browser receives a URL conceptually resembling site.example/file/ABC#SECRET.
That behavior does not exist specifically for MEGA.
The Browser Removes the Fragment Before the Request
That does not mean every character is transmitted to the web server in the HTTP request.
MEGA's security white paper explicitly describes this property, explaining that the material after the anchor hash in its public-link format is not sent to MEGA's servers and remains locally in the user's browser.
The File Handle and the Decryption Key Have Different Jobs
A public handle can identify which encrypted data is being requested.
Its client can use the handle to obtain the corresponding encrypted file and then use the key information to verify and decrypt the content.
This separation is one of the easiest ways to understand the system: the server can know which encrypted object is being requested without receiving the fragment from the URL request itself.
Why MEGA Needs Client-Side Cryptography
MEGA's architecture is built around client-controlled cryptographic operations.
The documentation describes file-specific cryptographic keys and client-side operations for encryption and decryption.
The Link Itself Can Carry What the Recipient Needs
If the complete link provides both the reference to encrypted content and the information necessary to decrypt it, possession of that link becomes security-sensitive.
This is why an encrypted sharing link should itself be treated as confidential when the underlying material is confidential.
A More Deliberate Way to Share Encrypted Content
MEGA also supports sharing a link without automatically giving the recipient the decryption key in the same message.
Someone possessing only the file reference should not automatically possess the separately communicated key.
Sending both pieces through effectively the same compromised channel may provide little practical separation.
Does This Mean MEGA Can Never Know the Key?
This point deserves careful wording.
The browser or application executing the cryptographic code must itself be trustworthy, and the user's device must remain secure.
The fragment architecture is meaningful, but it is not by itself proof against every possible attack.
The Server Not Receiving a Fragment Does Not Make It Invisible Everywhere
The complete URL may still be visible to the user, browser environment or anyone who gains access to where that link was copied or stored.
Forwarding the complete link forwards the key component as well.
A File Link Without Its Key Is Incomplete for Decryption
The encrypted object may still exist on MEGA's infrastructure, but the recipient needs the appropriate key before the client can interpret it.
The missing key is not simply another account password.
Why a Missing Key Is Not a Normal Password-Recovery Problem
The purpose of high-entropy cryptographic key material is precisely to make unauthorized guessing infeasible.
Searching for a trick that somehow makes encrypted content readable without the appropriate key misunderstands the security model.
How Protected Links Change the Sharing Model
MEGA has also documented password-protected public links.
The effectiveness of that protection still depends in part on the secrecy and quality of the password.
A Small Character Reveals the Architecture
It marks a boundary with real significance under URL semantics.
The result illustrates how browser behavior and cryptography can work together in an encrypted cloud-storage system.
Encryption protects access only while the relevant key information remains under appropriate control.
Article 2
MEGA Transfer Quota Explained: Why There Is No Single Free Download Limit
One of the most confusing parts of using MEGA is discovering that having plenty of available cloud-storage space does not necessarily mean you can continuously download or stream an unlimited amount of data.
Trying to answer “What exactly is the MEGA free download limit?” with one permanent number misses how the current system operates.
That is why two users—or even the same user at different times—can encounter apparently different limits.
What Is MEGA Transfer Quota?
When MEGA refers to transfer quota, it is talking about data movement rather than the amount of information occupying your cloud drive.
This distinction explains a common source of confusion.
Likewise, unused MEGA storage does not automatically provide additional free download capacity.
Watching a Video Is Still Transferring Data
Users sometimes assume transfer quota matters only when clicking a Download button.
The relevant measurement is data transfer, not simply the number of files appearing in a Downloads folder.
The Number Everyone Wants Is the Number MEGA Keeps Dynamic
This is where many explanations become outdated.
Recent MEGA support explanations specifically caution against interpreting familiar figures such as 4 GB as a permanent free-transfer allowance.
A number experienced by one user is not necessarily a contractual or universal free allowance.
The Six-Hour Window Explained
MEGA's recent explanations describe free transfer quota in relation to data transferred from an IP address over the previous six hours.
Available capacity is not necessarily best understood as “receive X GB, wait exactly six hours, receive another identical X GB.”
System Utilization Changes the Experience
A previous download session therefore cannot reliably predict a future one.
Consequently, anecdotes from users in different regions should not automatically be treated as universal limits.
Why the Limit Is Connected to Your IP Address
Multiple people accessing MEGA through the same public IP can affect the transfer activity associated with that IP.
Imagine several devices behind the same shared internet connection.
Free-account identity and free-transfer accounting are not necessarily the same thing.
“I Haven't Downloaded Anything—Why Am I Already Over Quota?”
That can occur on shared networks or other environments where multiple users appear under the same public address.
This can produce a seemingly impossible “quota exceeded” message for someone who believes they have transferred nothing.
Dynamic IP Addresses Make the Experience Less Predictable
That makes IP-based quota behavior inherently less intuitive than a simple account-based counter.
The free-account experience involves infrastructure beyond the account itself.
The File Is Not Necessarily Broken
The transfer may simply have reached the currently available allowance.
MEGA has explained that downloads can resume when the over-quota condition resolves and additional free capacity becomes available.
A Multi-Gigabyte Transfer Makes the Restriction Obvious
Large video archives, backups and other multi-gigabyte files make the system much more visible.
This also explains why users can disagree dramatically about the service.
Storage Quota vs Transfer Quota
Storage quota determines how much data can reside in the account, while transfer quota governs relevant data transferred from MEGA.
The amount stored does not tell you how much free transfer remains.
Why Pro Users Should Check Their Plan Allocation
MEGA's current pricing information distinguishes free accounts with limited transfer capacity from Pro plans carrying higher transfer quota.
Recent MEGA support information also distinguishes free IP-based quota measurement from Pro quota measured per user account.
Your Dashboard Is More Useful Than an Old Blog Post
Dynamic systems are better understood through current account information than historical anecdotes.
What is available now does not establish what every free user will always receive.
Old Rules and User Experiences Become Internet Facts
Some may reflect what particular users experienced at particular times.
Recent MEGA statements make the dynamic nature of free quota much clearer.
Browser Privacy and Network Identity Are Different Things
Browser privacy controls and transfer accounting operate at different layers.
Understanding what is actually being measured prevents a great deal of unnecessary troubleshooting.
The Supported Choices Are Simpler
Those approaches attempt to work around the service's intended Source quota mechanism and can introduce additional privacy, security or terms-related concerns.
The straightforward supported choices are to wait until additional free quota becomes available or use a MEGA plan providing additional transfer capacity.
Does Streaming Count Against MEGA's Transfer Limit?
Yes. MEGA states that streaming consumes transfer quota.
Storage availability and playback transfer remain separate considerations.
The Quota Is More Complicated Than a Kitchen Timer
Users sometimes report that an estimated waiting period changes or that their expected quota does not return in the way they anticipated.
That explains why simplistic “X GB exactly every six hours” explanations can be misleading.
MEGA Transfer Quota FAQs
How Many GB Can I Download From MEGA for Free?
Numbers commonly repeated online should therefore be treated as historical experiences rather than guaranteed current allowances.
Is MEGA's Download Limit a Six-Hour Limit?
MEGA says its free quota considers data transferred from the IP address over the previous six hours.
Is My MEGA File Broken When Transfer Quota Is Exceeded?
A transfer can pause when the currently available quota is exhausted.
Does Watching a Video Count as Downloading on MEGA?
You do not need to save a permanent local copy for data transfer to occur.
Why Does a New Account Still Show Transfer Quota Exceeded?
On shared, dynamic or reused IP addresses, relevant transfer activity may therefore include activity not associated solely with your current account.
Can Clearing Cookies Reset the Download Limit?
Browser state and network identity are separate concepts.
Does 20 GB of Free Storage Mean 20 GB of Free Downloads?
The two quotas measure different resources.
What Can I Do When MEGA Says Transfer Quota Exceeded?
Free users can wait for additional transfer quota to become available, while users who regularly require larger transfer capacity can consider a paid plan with additional quota.
Understanding MEGA Transfer Quota Without the 5 GB Myth
Once that distinction is understood, many apparently contradictory user reports stop being contradictory.
A person downloading several gigabytes today and considerably less—or more—another day is not necessarily seeing a malfunction.
The useful rule is therefore not “MEGA gives exactly X GB.”
And that is precisely why the internet's endlessly repeated 4 GB and 5 GB answers can create more confusion than clarity.