What MEGA does well
MEGA earns its reputation. It is end-to-end encrypted and zero-knowledge: files are encrypted on your device with keys derived from your password, and MEGA cannot read them — it cannot even send a password reset link, only restore access from your recovery key. That is a serious privacy posture, not a marketing line, and MEGA has shipped it at scale for years.
It is also open and broad. MEGA publishes the full source code for its client apps so anyone can examine them, and it ships native apps across Windows, macOS, Linux, iOS, Android and Huawei, plus browser extensions and a web client. Its free tier is generous — a minimum of around 20 GB, expandable through one-off tasks. If you want a mature, widely supported, zero-knowledge product whose client source you can read, MEGA is a reasonable default.
The rest of this page is about the narrower cases where a different set of tradeoffs fits better.
Why people look for an alternative
People who already use MEGA still come looking for an alternative, usually for one of a few concrete reasons:
- Post-quantum protection on stored files. They want files encrypted today to stay confidential even against a future quantum computer, not only against present-day attackers. MEGA's published materials do not describe any post-quantum encryption.
- A larger symmetric key. MEGA encrypts file content with AES-128. That is practically unbreakable by classical means today, but some buyers' policies specify AES-256-class protection, and the longer key is one input to long-term confidentiality.
- EU data residency, specifically. MEGA lists its data centres as Japan, Canada and/or the EU. If a compliance requirement or client contract says the encrypted data must sit inside the EU, "the EU is one of several possible locations" is not the same as "the EU."
None of these are knocks on MEGA. They are requirements MEGA does not optimize for, and where a different product can.
Where ShieldFive differs
ShieldFive is a storage product that differs from MEGA in a few specific, checkable ways. It does not differ on everything — both are zero-knowledge, and both publish client source — so this section is deliberately narrow.
Post-quantum by default on stored files. ShieldFive defaults every new upload to a post-quantum hybrid suite: ML-KEM-1024 (FIPS 203) combined with a classical cipher, so a break in either component alone does not expose the file. MEGA's current public materials do not describe any post-quantum or quantum-resistant encryption.
This matters because of "harvest now, decrypt later." An adversary can copy encrypted files today and simply wait — storing the ciphertext until a quantum computer capable of breaking classical key exchange exists, then decrypting it retroactively. Files with a long confidentiality lifetime — legal records, medical data, source material, trade secrets — are exposed to that strategy the moment they are uploaded. Post-quantum encryption at upload time is the only point where you can close that window. You cannot retrofit it onto data an adversary already holds.
Symmetric key size. MEGA encrypts file content with AES-128, using a custom chunk-based AES construction. AES-128 is not broken and is not in practical danger from classical attackers — independent reviews say as much. The distinction is narrower: ShieldFive's symmetric layer uses a 256-bit-class key and pairs it with post-quantum key encapsulation, and it is that pairing, not the key size alone, that addresses a future quantum adversary rather than a present-day one. If your concern is the long confidentiality lifetime of the data, that combination is the point.
EU data residency. ShieldFive stores encrypted data in the EU, under EU jurisdiction. MEGA's cloud service is now contracted through a Hungarian entity, so EU law applies to the agreement, but MEGA lists its data centres as Japan, Canada and/or the EU. If your requirement is that the encrypted bytes physically reside in the EU, ShieldFive answers that specific question more directly. If it is not your requirement, it is not an advantage.
An open crypto core — and MEGA publishes its clients too. ShieldFive publishes its encryption core under Apache-2.0, an OSI-approved open-source licence: the same code that runs in your browser, with a public specification and test vectors. This is genuinely a ShieldFive property, but it is not a point against MEGA — MEGA also publishes the source of its client apps for anyone to examine, under its own licence terms rather than a standard OSI one. On "can you read the code that encrypts your files," the honest answer is that both let you, and that is a good thing about both.
No AI training and no scanning. Like MEGA, ShieldFive does not train models on your files and does not scan their contents — not as a policy, but because the server only ever holds ciphertext encrypted on your device. This is a property both zero-knowledge architectures share. We mention it because it is a common question, not because it separates us from MEGA.
Pricing. ShieldFive's free tier is 20 GB with no card required, comparable to MEGA's free storage. Shield+ is 2 TB at €2.75/month billed every three years, €6.67/month billed annually, or €7.99 billed monthly. Compare against MEGA's current plans directly, since both vendors change pricing over time.
Where MEGA is ahead, honestly
A fair comparison has to run both ways, so here is where MEGA is the stronger choice today.
Maturity and scale. MEGA has operated a large zero-knowledge storage service for over a decade, with a very large registered user base. ShieldFive is new. Track record is real, and MEGA has one.
A public, examined codebase. ShieldFive's crypto core is open and readable, but it has not yet completed a third-party audit — that audit is planned, not done. MEGA's client source has been public and examined by outside researchers for years. If independent scrutiny that has already happened is what you need today, that is a real point in MEGA's favour, and worth stating plainly rather than implying a parity that has not been earned.
Breadth of apps. MEGA ships native apps for Windows, macOS, Linux, iOS, Android and Huawei, plus browser extensions and a web client. ShieldFive's client surface is narrower. If you depend on a specific native client on a less common platform, check that MEGA covers it where ShieldFive may not.
If you need a mature, broadly supported, already-scrutinised zero-knowledge service today, MEGA is the stronger pick.
Which one fits you
MEGA fits you if you want a mature, widely supported, zero-knowledge service whose client source is published for inspection, with a generous free tier, and AES-128 with data centres spread across several regions meets your requirements. It is established, broadly available, and its clients are open to inspection.
ShieldFive fits you if your priority is post-quantum protection on stored files by default, a 256-bit-class symmetric layer, and encrypted data that sits specifically in the EU — particularly for files with a long confidentiality lifetime, where "harvest now, decrypt later" is part of your threat model.
Try it
The way to evaluate this is in practice. ShieldFive's free tier is 20 GB with no card, enough to test the workflow with non-critical files first — upload, share with expiry, revoke — before moving anything that matters. Migration is a risk-tiering decision: move the highest-sensitivity files first, the ones where post-quantum protection or EU residency actually changes the exposure, and leave the rest wherever it already works.
This comparison reflects each vendor's public documentation as of 2026-06-17 and will be updated as the products change.