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Who would have thought that the same link, when placed in a Telegram channel, becomes just plain text, like a bowl of plain noodles without any seasoning, but when placed in Google Chrome, it opens as an image instantly? 🤯 The difference is simply outrageous!
Telegram preview image ≠ the image seen in the browser
First, let's clarify one thing: the preview images you see in Telegram channels are not "images on the webpage," but rather images that the Telegram bot secretly crawls from the webpage's Open Graph (OG) tags.
If your page says:
<meta property="og:image" content="https ://example .com/xxx.jpg">
Telegram will display this picture obediently.
But - if the web page does not haveog:image, or the image is blocked by anti-hotlink blocking, the robot will be confused and will only give you a bare link.
Chrome is a person walking in, Telegram is a robot looking through the fence
Chrome is like you going to a store in person, where the merchant will of course serve you tea and water and present you with pictures.
Telegram bots are more like peeking through a window, sometimes blocked by the reflection of the glass, and you can't see anything. 🙈
That's why one can show and the other is blind.
Several common pitfalls
1. Hotlink Protection
Some websites have enabled anti-hotlinking strategies: as long as the Referer is not their own domain name, all will be 403!
There is no problem with Chrome access because you open it directly.
Telegram's Referer comes fromt.me, and was stopped directly.
2. Jump logic has pitfalls
Many people use CDN or subdomains, which results in 301 redirects. Browsers are smart and will automatically complete the URL to HTTPS.
The Telegram robot foolishly requested HTTP → was blocked by security policy → the image disappeared.
3. CloudflareRule interception
Websites using Cloudflare are frequently affected. Even without Hotlink enabled, Cloudflare's WAF, Bot Fight Mode , and even Rate Limiting will misidentify TelegramBot as a "malicious crawler," resulting in all preview images being lost.
4. No OG tags
Some site owners don't bother adding Open Graph. The result? Telegram doesn't even know which image is the cover.
It's like a book without a cover. No one can understand it when it's on the bookshelf.
Do-it-yourself universal testing method
Want to know if your link will include an image in Telegram? Here are three steps!
Step One: Check the OG Tags
Open the source code of the web page and search <meta property="og:image".
Is there one? If not, try adding one.
Step 2: Simulate Telegram request
Test with the command line:
curl -I -A "TelegramBot (like TwitterBot)" https://www.chenweiliang.com/
Check the status code returned. 200 = Safe ✅ 403 = Blocked ❌ 301/302 = Redirect issue 🤔
Step 3: Send yourself a private message
The most direct way is to send the link to "Saved Messages". If the thumbnail can be displayed, there is probably no problem in the channel.
Several ways to solve the problem
1. Add OG tags to the header of the web page
<meta property="og:image" content="https ://media .example.com/cover.jpg">
2. Cloudflare Adjustment
- Turn off Hotlink Protection.
- Allow in firewall rules
TelegramBot. - Enable "Always Use HTTPS" to avoid the embarrassment of 301 redirection to HTTP.
3. Image size must be compliant
Minimum requirements for Telegram preview images:
- Width ≥ 300px, Height ≥ 200px
- Use JPG/PNG format, don’t use WebP.
Why does the browser work but Telegram doesn’t?
In short: Chrome automatically "fills in the gaps" and fixes a bunch of minor bugs, while the Telegram bot is completely unreliable; it only follows the most rigid logic.
Therefore, just because the browser can see the image does not mean that Telegram can see it.
Conclusion
In my opinion, preview images are no longer just minor details to be tweaked; they're the primary frontier of content distribution. OG tags are the face of social media. If this link fails, traffic to your site will be halved.
When we discuss the differences between Telegram and Chrome, we are essentially exploring the differences in how machines and humans perceive information.
Chrome is a personified smart tour guide, while the Telegram robot is more like a cold law enforcement officer, strictly adhering to the HTTP protocol and not giving you any more help.
Therefore, preview image issues are not minor bugs, but a fundamental question concerning your website's content ecosystem . The true content powerhouse is the one who can ensure perfect display in all environments.
👉 So, next time before you send a link, check it carefully to avoid sending a bare, lonely link in the group, which looks even more deserted than an emoticon.
Hopefully, the article "No Preview Image for Telegram Channel Sharing? How to Solve Cloudflare, 301 Redirect, and og:image Issues" shared on Chen Weiliang's blog ( https://www.chenweiliang.com/ ) will be helpful to you.
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