Are Free Proxies Safe?
No, free proxies are not safe for anything you care about, and paid proxies are not automatically safe either. A 30-month study of 640,693 free proxies from 11 public lists (MADWeb 2024) found that only 34.5% ever worked, that only about 2.5% of the working ones handled HTTPS, that 16,923 altered the pages they passed on, and that the proxies' IPs carried 4,452 known vulnerabilities, 1,755 of them allowing remote code execution. A paid proxy is safer only when its operator is accountable: it says what it logs, carries HTTPS without decrypting it, runs an abuse process and answers support. ProxyField sells paid residential proxies from $1.95/GB; start with the Easy Trial: 1 GB for $2.95, with no minimum purchase and no subscription.
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On this page 9 sections
What the largest study of free proxies found
Naif Mehanna, Walter Rudametkin, Pierre Laperdrix and Antoine Vastel collected free proxies from 11 providers of public lists and tested every one of them daily for 30 months (Free Proxies Unmasked, MADWeb workshop at NDSS 2024, doi 10.14722/madweb.2024.23035).
| Finding | Figure |
|---|---|
| Proxies collected and tested daily | 640,693 over 30 months, from 11 list providers |
| Ever active, even once | 34.5% |
| Working on an average day | 3.36% of the list |
| Answered on the HTTPS test page | about 2.5% of those that answered over HTTP |
| Altered the page they passed on | 16,923 proxies; 5.7% of active proxies per daily run |
| Size of the altered content | 36 KB on average, for a test page of 2 bytes |
| Known vulnerabilities on the proxies' IPs | 4,452 distinct CVEs |
| Of those, allow remote code execution | 1,755 |
| Of those, allow privilege escalation | 2,036 |
| Proxies that appear to run on MikroTik routers | 42,206 |
| Where most of them are | the US and China |
The authors' conclusion: the instability, vulnerabilities and potential for malicious actions they found "lead us to strongly caution users against relying on free proxies."
Free proxy vs paid proxy: what changes
| Feature | Free or open proxy | Paid proxy from an accountable provider |
|---|---|---|
| Who runs it | Usually unknown; often a misconfigured or hijacked device | A company you pay, with published policies |
| Works when you need it | 3.36% of a list on an average day (study above) | A gateway that moves traffic to the next node if one slows down |
| HTTPS | Mostly not supported, so you are pushed to plain HTTP | Supported; check that it is tunneled, not decrypted |
| Changes to pages | 16,923 proxies altered content in the study | None should be made; ask the provider |
| Logging | Unknown; can be kept, sold or leaked | A written policy you can hold it to |
| IP reputation | Shared by everyone on the list, often blacklisted | A managed pool |
| Abuse handling and support | None | An abuse process and a support channel |
7 risks of free proxy lists
1. Your traffic can be read and changed
A proxy sees every unencrypted request in full. On plain HTTP pages, a free proxy can read form fields and cookies and change the page on the way back, for example to inject ads or scripts. In the 2024 study, 5.7% of active free proxies returned altered content on an average day, adding 36 KB on average to a 2-byte test page. HTTPS protects the content, because the TLS session runs end to end through the proxy's tunnel (MDN), but only about 2.5% of the free proxies that answered over HTTP also answered over HTTPS, and the operator still sees every host name you visit.
2. Nobody answers for what is logged
A free proxy has no contract with you and no privacy policy you can hold it to. Whatever it records about your IP address, the sites you visit and when, it can keep, sell or lose. The FTC has warned that even companies selling privacy tools must keep the promises they make (FTC, 2024); a free list makes none.
3. Many run on hijacked or vulnerable machines
Open proxies are often devices set up wrongly or taken over by criminals. The 2024 study found 4,452 distinct known vulnerabilities on the free proxies' IP addresses, 1,755 of them allowing remote code execution and 2,036 privilege escalation, and 42,206 proxies that appear to run on MikroTik routers; one router flaw it saw 795 times (CVE-2022-41318) can expose cleartext credentials. The FBI's May 29, 2024 announcement (I-052924-PSA) on a dismantled residential proxy botnet describes "malicious proxy backdoors that were built into VPN applications" and free VPNs "packaged within pirated video games and software", and lists bomb threats, financial fraud and identity theft among the crimes run through the hijacked devices. In March 2026 the FBI warned again that home devices are pulled into proxy networks, often without their owners' knowledge (FBI PSA I-031226-PSA). Routing your traffic through such a host ties it to a crime scene.
4. Logins and sessions can be stolen
Any login sent over plain HTTP through a free proxy is exposed, and session cookies can be captured the same way. A proxy that asks you to install its certificate can read your HTTPS traffic too; never accept that from a free service.
5. Free proxy apps and extensions can carry malware
The 2024 FBI announcement is the clearest example: free VPN apps installed a proxy backdoor that turned the user's own device into an exit for criminals. Browser extensions that offer free proxies need permission to read the sites you visit. Install neither from unknown publishers.
6. The IPs are already blocked
Free proxy IPs are used by many people at once, including spammers and attackers, so sites and blocklists flag them. Your requests fail, you see endless CAPTCHAs, and accounts you log in to through them can be flagged; why your IP gets blocked explains the mechanics.
7. Most of the list is down at any moment
On an average day of the study, 3.36% of the collected proxies worked, and 65.5% never answered once in 30 months. The authors put part of it down to load: free lists are easy to find, so the proxies that do work are often too slow to answer before a timeout. There is no support and no way to pick a city or keep a session, so for scraping or monitoring a free list turns into retries, gaps in data and wasted engineering time.
Are paid proxies always better?
No. Paying moves your trust from an unknown host to a company, and that only helps if the company is accountable. A paid provider can still log your traffic, and a proxy app or extension can still be a backdoor, which is how the botnet in the FBI's 2024 announcement spread. Before you pay, check these points; the third column is how ProxyField answers them, so you can compare.
| Ask the provider | Why it matters | ProxyField |
|---|---|---|
| What do you log, and for how long? | Logs are what can leak or be handed over | We don't record the content of your traffic or the pages you visit. Connection metadata is kept for up to 30 days. |
| Do you decrypt HTTPS? | Decryption means the provider reads everything | HTTPS goes through a CONNECT tunnel and is not decrypted. |
| Do you add headers that reveal my IP? | Via or X-Forwarded-For headers expose the client | The gateway adds no Via, X-Forwarded-For or Forwarded header, and your Proxy-Authorization is removed before the request reaches the site. |
| How do I authenticate? | Open proxies need no login, so anyone can use them | Username and password, or an IP allowlist. |
| What happens with abuse reports? | An abuse process keeps criminals off the IPs you share | A published abuse process; confirmed abuse leads to a warning, limits, suspension or closure (trust center). |
| How do I pay, and what do you ask for? | Card and ID data is more data to lose | Crypto only; ordinary purchases need no ID. As with any blockchain payment, the transaction is public on the chain. |
| Can I test before I commit? | A small purchase limits what you risk | The Easy Trial: 1 GB for $2.95. All purchases are final; the traffic never expires. |
The longer comparison of proxy risks, paid and free, is in are proxies safe.
Are free proxies legal?
Using a proxy is not illegal in itself in the US, the EU or the UK; what you do through it is judged by the usual laws. The catch with free lists is open proxies: many are devices whose owners never meant to run a public proxy, so using one can raise the same unauthorized-access question as using any computer you were not invited into, and your traffic may run through a crime victim's device. What an open proxy is explains the difference, and the full legal picture is in are proxies legal. This is not legal advice.
If you must test a free proxy
- Check the list first: the proxy checker takes up to 100 proxies per check, and your list and results are not stored. Expect most entries to be dead.
- Use the proxy only for HTTPS sites, and never log in to anything.
- Run it in a separate browser profile or a throwaway virtual machine.
- Never install a certificate, an app or an extension that comes with it.
- Do not send company or customer data through it, and do not build anything on it.
Where ProxyField stands
ProxyField is a paid service. The entry is the Easy Trial: 1 GB for $2.95 (mobile $3.45), with no minimum purchase and no subscription. The traffic never expires, and it runs on the same pool and quality as a 1 TB order; residential proxies fall to $1.95/GB from 1,000 GB. Connections run over HTTP, HTTPS and SOCKS5 on gate.proxyfield.io:7000 with a username and password, or allowlist your IP and connect to the port you set up in the dashboard; 24/7 live chat helps with setup. See residential proxies and pricing.
Are Free Proxies Safe? FAQ
Are free proxies safe?
ProxyField, which sells paid proxies from $1.95/GB, does not consider free proxies safe for logins, personal data or business work. In a 30-month study of 640,693 free proxies, 16,923 altered the content they passed on and only about 2.5% of the working ones supported HTTPS. Use one only for throwaway tests over HTTPS.
Are free proxies safe to use, or are paid proxies always better?
Free proxies are not safe for anything sensitive, and paid proxies are not always better: paying helps only if the operator is accountable. Check that the provider says what it logs and for how long, tunnels HTTPS without decrypting it, requires a login or allowlist, and has an abuse process and support. Free proxies are fine only for tests where nothing sensitive is sent.
Are free proxies reliable?
No. In the MADWeb 2024 study, only 34.5% of 640,693 free proxies were active even once in 30 months, and on an average day 3.36% of the list worked. The ones that work are shared by everyone who found the same list, so they are often too slow to answer.
Are free proxies legal?
Using a proxy someone deliberately offers for free is generally legal. Using an open proxy whose owner never meant to offer it can raise unauthorized-access questions, and you cannot tell from a list which is which. Whatever you do through any proxy is judged by the usual laws.
Do you need to pay for a proxy?
Not for a one-off test, but for regular work, yes: free proxies are unstable, often blocked and run by unknown operators. Paid residential proxies are usually priced per GB, so a small test costs little; with ProxyField you can start with 1 GB for $2.95.
Are free SOCKS5 proxies safe?
No more than other free proxies: SOCKS5 adds no encryption, and a free SOCKS5 server sees every host you connect to and everything you send without TLS. In the 2024 study, free SOCKS proxies altered content about as often as HTTP ones, 6% of active proxies per run against 6.6%.
Are free datacenter proxies safe?
No. A free proxy on a server is still run by an unknown operator who can log your requests and alter HTTP pages, and its IP is shared by everyone on the list, so it is often blocked. The risks on this page apply whatever kind of machine the free proxy runs on.
Do free proxies work?
Sometimes, briefly. On an average day of the MADWeb 2024 study, 3.36% of the free proxies collected worked, the IPs are often blacklisted, and there is no support or targeting. They can do for a quick check of how a page looks elsewhere, not for scraping or monitoring.
Why are free proxies slow and unreliable?
Because they are shared by many users at once, run on whatever machine happens to be open, and have no one maintaining them. Free lists are easy to find, so the proxies that work are loaded and often too slow to answer before a timeout; when the owner fixes the misconfiguration or the host goes offline, the proxy disappears.
Is it safe to use free proxy lists from GitHub in my code?
Not for production. Lists on GitHub are scraped from the internet and go stale quickly, the hosts are unknown, and your requests and any credentials or API keys in them pass through those hosts. For code that runs on a schedule, use a paid gateway with credentials kept in environment variables.
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Should I use a free proxy or a free VPN?
Neither for anything sensitive. The FBI's May 2024 announcement describes free VPN apps that carried a proxy backdoor and turned users' devices into exits for criminals. If you need privacy on public Wi-Fi, a reputable paid VPN is the safer choice; if you need IPs in other places for business work, a paid proxy is.
Is there a safe and free proxy server available?
Not one you can trust with logins or private data: without a paying relationship there is no one accountable for what the server does with your traffic. The proxies built into your own company's network, run by your IT team, are the exception.
Sources
Checked on October 27, 2026:
- Mehanna, Rudametkin, Laperdrix and Vastel, Free Proxies Unmasked: A Vulnerability and Longitudinal Analysis of Free Proxy Services, MADWeb 2024 (NDSS Symposium), March 1, 2024
- MDN, proxy servers and tunneling
- FBI/IC3 public service announcement I-052924-PSA (May 29, 2024)
- FBI, I-031226-PSA (March 12, 2026)
- FTC, keeping privacy-enhancing technology promises (2024)
Related pages
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