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Understanding rejection on WeChat (Weixin)

(Quick links: cache cleanup, audio, pictures and video. See also URL encoder for mobile chat.)

Many Chinese people now prefer to manage their contacts using a proprietary mobile messaging and social networking application called WeChat (微信)Wēixìn. If you frequently meet them, you might be tempted to set up your own WeChat ID for their convenience. This can however lead to some quite ephemeral contact sharing (e.g. someone you met on a bus adds you but later deletes you). Since I found very little English documentation about how this manifests itself, I experimentally confirmed the following in 2015:

Other party's actionResult on your side
Delete conversationNo immediate effect. If you send further messages, a new conversation is started on the other device, but it still looks like one continuous conversation on yours.
Clear chat historySimilar to "Delete conversation" above
Delete and Leave (in a group chat)Deletes their copy of the chat history and removes them from the group. The group continues to exist, and is not notified of their departure unless other members actively re-read the membership list. (To really shut down a group, an administrator can remove each member from it. Even then, each member continues to keep a copy of the group chat history for the time they were a member, until they delete it themselves or reinstall etc. For larger groups there is also a limit to the number of members displayed in "Chat info", leading to some members being 'invisible' unless you tap the words "All members" below the list, the Chinese version of which is 查看全部群成员 which is more obviously a 'command' than the English version.)
Block (加入jiārù 黑名单)hēimíngdānNo immediate effect unless you check their Album (Moments), which behaves as if they'd selected "Delete contact" (below). But if you send further messages, you are told "The message is successfully sent but rejected by the receiver" and the other party is told nothing. (The word "receiver" here evidently means the receiving account, not the receiving device---the "rejected" text still appears even if the other party's phone is powered off at the time.) They can still send you messages. Note also that if you send a "broadcast message" (群發, located under Me / Settings / General / Features for some reason), you are not told which recipients reject it; you must send individual messages to be told.
Delete contact (删除)shānchúNo immediate effect unless you check their Album (Moments), which will be blank if they've turned off "Public Moments" in the privacy settings (but this could also mean they've seleted "Don't share my moments" with you, or simply haven't ever posted anything for non-Tagged contacts); if they have "Public Moments" turned on then you will see the message "Only 10 posts of this user are visible" (the Chinese version of this message begins "non good-friend" which was lost in translation prior to 2019---the English version has since been updated to "Only the last 10 Moments are shown because you aren't friends on WeChat"), and the options to Like or comment on the posts are not displayed (but some versions of WeChat still let you "Like" the album "cover"). Not to be confused with the message "Only 3 days of Moments are viewable" (which happens if they set Settings / Privacy / Set a time limit for Moments viewable by others)---that one applies whether or not you've been deleted, and still lets you comment if not.

If they deleted you and you try to send further messages outside the Album, you are automatically put back through the process of adding yourself to their contacts: if they've turned on "friend confirmation", you'll see "(Person) has requested friend verification. Please send a friend request to chat" with a link to do it; otherwise your message goes through immediately and they are given the message along with the option to add you. Previous conversations are deleted from their side but not from yours. "Broadcast messages" are silently dropped as above.

If you attempt to create a group chat via "+" / "New chat" (which lets you select up to 39 people) and select 2 or more: if none of the people you select have you in their contacts (or if all the ones who do are blocking you), you get the message "Unable to start group chat" with "hasn't added you as a friend yet" (you can then press Cancel and review the selection); if some have you in their contacts (and are not blocking you) then the group chat will be created but you'll get a message at the top saying which ones were not added. Do not do this just to test though, as anyone who has their account set not to be automatically added to groups will be sent an immediate invitation (some websites claim nobody is notified about a group until you send the first message, but that's inaccurate). The invitation is automatically declined by anyone who has you as a blocked contact, and you get told about this action, but those who have not blocked you might see an invitation.

Block and delete contactBehaves exactly like Delete contact alone, since deleted contacts are also removed from the Blocked List
拉黑Lā hēi (拉进lājìn 黑名单)hēimíngdānAs far as I can tell, these are not actual WeChat options but are colloquial terms for the above 'block' or 'delete' operations, probably carried over from other software. However I have not tried every version on all platforms---there might be variation in terminology between WeChat versions.
Report (投诉)tóusùIn 2021 I submitted a real one as a contact's account was taken over by someone who used it to send me dirty pictures. I was asked to choose messages to send as evidence; WeChat responded with "Violation confirmed" and "User handled with Temporary Block" and the person was no longer listed on my Chats or Contacts view but was still findable on Search and on Me / Settings / Privacy / Blocked List (so, blocked for me, but also prevented from logging in to WeChat).
Uninstall the WeChat applicationNo effect. They're just offline until they reinstall. I don't know how long it takes for an unused account to expire.
Delete accountContact is greyed out and marked "Account deleted"; selecting it says "account deleted by other user" and presents a Delete button which, if pressed, also deletes the conversations; otherwise any attempt to send more messages is met with "The other user cannot receive message"
Spontaneous "Delete contact" is also possible. This is when WeChat deletes one of your contacts, resulting in the person and all previous chats disappearing without trace, as if you'd deleted it yourself. Since "Delete contact" takes 5 screen taps, it cannot easily be blamed on an overly-sensitive touch-screen, and since I was unable to reproduce it, I can only conclude it's either a race-condition bug or else a user action available only in the China version of the software and/or to an administrator. (Please don't 'gaslight' me: I know that contact existed before it disappeared! On 7th August 2015 a Shanghai Daily reporter used the sentence "The woman vanished from Wang's WeChat contacts afterward", which might imply a "completely disappear from the other party's contacts" function somehow being available in China, unless the word "vanish" was here used metaphorically.)

Error message when adding people

In early 2021 WeChat started to display the Chinese-only error message 请先设置朋友权限 when you try to add a contact. This message was displayed too fast for me to read and it could not be copied: I had to screen-shot it and use OCR to find out what it said---it's basically "please set friend permissions first" and refers to a new setting at the bottom of the Add screen (you might have to scroll down if you're in large print on a small device) that lets you choose whether or not to also share your "Moments" with this person. It might have been better if the developers had set it to focus those controls when this happens, but at least we now know. (In particular, this message doesn't say the person is refusing your Add request.)

Emoji warning

In 2020 it was pointed out to me that the standard WeChat "smile" emoji (the one that can be produced by typing [Smile] or [微笑] in your text, or selecting the closed-mouth smile from the menu) is seen by some as mocking rather than happiness, and it is now safer to use [Chuckle] ([偷笑]), [Grin], [Joyful], [Laugh] or the Unicode emojis U+1F600, U+1F601 or U+1F604 (I'm not sure where the older U+263A fits into this).

A related issue is "stickers" (called "emoji packs" in the Chinese version)---some youngsters have sticker-packs with seizure-inducing strobic flashes. I have contacted Tencent urging them to implement a "disable animations" option and I suggest you do the same (they might notice if more people ask); meanwhile if you have photosensitive epilepsy you'd better stay out of any chat that might include young people, in case in their innocence they post one of those or (even worse) a whole series of them and accidentally give you a seizure.

Don't bother with "red packets"

If someone tries to send you a "red packet", the funds they deposited will be returned to them if you don't open it within 24 hours.

WeChat used to allow non-Chinese accounts to open "red packets" and later forward the balance to other Chinese friends (it could not be spent outside China), but in 2019 they began to require a China bank card for any transaction---and the app takes you through a lengthy "real-name confirmation" process before it even tells you this requirement.

Image and video limits

If pasting a scanned document into a WeChat conversation as an image, the size limit is 300KiB, after which the image is shown only as a blurred preview unless the recipient presses a small button they might not notice. So it's best to stay below 300KiB.

I have a separate page for technical information on creating narrow-column screenshots.

For inline videos:

  • The time limit is just under 5 minutes (4:59 is accepted but 5:00 is "Video length too long"),
  • the file size limit is just under 14MiB (so if using the full 4:59, the bitrate limit is about 384k, e.g. 256k video + 128k audio), and the mobile application should be used to introduce these into the WeChat network (i.e. by 'Share' or 'Send' from another mobile application)---at least some versions of the desktop application send videos as "files" that need extra action to view. Attempts to send videos larger than 14MiB on the mobile application get the error "unable to import", although the "say something" caption (if any) is sent anyway. The error "Unable to share this video due to unspported format" (e.g. if trying to post a short video to Moments) probably means you need to recode to h264.

    By comparison, WhatsApp usually compresses inline images to around 250k (with no option to see full size) and limits video to 16MiB (as of 2017; best sent from the mobile application), and Telegram Messenger scales down to max 1280 pixels per dimension and sends the result as an 87%-quality JPEG (unless uploaded as a file) but has a much more generous video limit.

    Audio recordings

    MP3 files are sent as "files" no matter what, so the desktop application can be used ("drag and drop"); if using the mobile application, shared files (unlike videos) need to be added to "WeChat Favourites" before they can reliably be sent to a chat. Once in Favourites, the option to "forward" from the "Favourites" screen is unreliable; it seems better to go into the chat itself and press the + button, scroll to the Favourites option, and find the MP3 that way. Ensure it is uploaded before deleting from Favourites. After you delete it from Favourites, you will get the message "This file is no longer available" when you try to open it in the chat, but the other party should still be able to access it for a few days.

    Cache bloat and hardware requirements

    The Android version of WeChat can build up multiple gigabytes in a directory with a 32 hex-digit name under /sdcard/tencent/MicroMsg. These files are not the chat logs---they're just cache (and I haven't found an option to clear it; Android's built-in cache-clearing option does not affect this).

    If a Chinese friend asks you to "fix" their WeChat on an older phone with internal storage measured in megabytes (such as the ChinaMobile-branded ZTE U809, which runs a version of Android 4.2 with only 177M of usable internal storage), beware this might no longer be possible because WeChat tends to insist on updating to its latest version, which now requires Android 5+ (partly because Tencent's own back-end servers now use HTTPS certificates not recognised by Android 4) and hundreds of megabytes of internal storage. Installing a very old smaller version of the APK will not work. The quickest solution could be to ask if they have a tablet or something to run it on instead: in one case I wasted 2½ hours trying 'hacks' only to find the person had already installed it on a tablet and didn't want it on their old phone that badly.

    Length limits

    If you rename your contacts, the new names are limited to 29 Unicode characters, and you are given a "too long" message if you try to set anything longer---so if your Chinese character skills are limited you can't write yourself too much of a reminder of how you met a person etc (unless you develop a terse shorthand code). Before the limit of 29 characters was implemented, there used to be a limit of 50 characters and the name would be truncated without warning; before that truncation was implemented, there used to be no practical limit. LINE's limit is only 20 characters, but at least there's a count (LINE also has other problems).

    Comments on WeChat "official account" posts are limited to 600 characters---there is no warning until you try to post, and there is no character-count indicator, so if you run into problems there you may have to use a different editor with character count and paste in the result (unless you want to go back to 1960s/70s programming where you had to manually count out the number of characters you typed into a Hollerith constant!)

    Chinese programmers might assume "one character" carries as much information as a Chinese character, so they may not realise how easy it is for English users to reach their limits. But the American developers of WhatsApp inexplicably limited group-chat titles to a mere 25 characters! (At least that limit is made obvious as you type.)

    Network effect

    WeChat's dominance in China was perhaps assisted by the company's good relationship with that country's network police, with its mobile operators (SIM cards with WeChat-specific data allowances are not unheard of), and with integrated shopping and payment services and "portals" to local facilities. Outside China, WeChat tends to lack these advantages, but many mainland Chinese visitors and immigrants keep using it anyway due to their existing network of contacts, and due to the convenience of WeChat's automatic contact-exchange facilities. Scanning a QR Code seems to have become the most popular method (this wasn't introduced to WhatsApp until mid-2020). A WeChat update in mid-2017 prevented the generation of QR codes while offline: if you expect patchy signal coverage, you now have to prepare by taking a screenshot of your QR code while connected. For most of 2017 it seemed these codes needed re-generating every 4 weeks, but in 2018 one of mine still worked after 28 weeks.

    The network effect does not appear to be very much diminished by the need for their data to be sent through Chinese servers (which, apart from anything else, can be slow when you're outside China), nor with the "vanishing contacts" issue or WeChat's limited functionality on the desktop. At least its sound compression ratio is reasonable, and Version 7 made a dark mode available (although not on the desktop version) and improved the range of font sizes under Settings / General (although if you turn this up to maximum on a phone then you might find some non-essential controls like 'comment on a channel video' are placed off-screen and you have to restart WeChat at a smaller size if you ever want to use them).

    Sometimes they'll accept an alternative installed alongside WeChat for use while they're in the UK. My current recommendation is Telegram Messenger, which is run by a non-profit, can be set to larger fonts, has a good range of desktop clients, etc. But not everyone even understands what it means to install a different application. Some of the older generation I met evidently had it installed by the manufacturer, a shop, or a friend or relative, and don't know what I mean by "install something else". Additionally, some older devices (e.g. iOS 4.x) cannot run recent versions of many applications, so it would be necessary to find an old version and somehow 'side-load' it, or risk an OS replacement.


    As with any form of messaging, it's probably best not to accept an `add' if you don't know who it is, especially if you actually visit an Asian country: con artists have reportedly tricked victims into going to a particular location for a "first meeting in person", only to be held to ransom by gangsters on arrival (this crime is easier to commit in small countries like Singapore). In June 2016 my WeChat ID (which I had given only to selected Chinese people I met in Cambridge) suddenly received an `add' request claiming to be from Malaysia and not giving me any clue who it was; to give them the benefit of the doubt I wrote "Apa khabar?" but received no reply and the next day eight other anonymous "Malaysians" had tried to add me. I find this highly suspicious. My ID could have been found via brute-force search, most likely of QQ numbers: I had my old QQ number linked to the account, but disabled "find by QQ ID" after this incident because I believe none of my genuine earlier contacts who had my QQ number are still likely to use it to find me. (I later discovered that QQ number was stolen so I unlinked it from the WeChat account completely.)


    On iOS, a pre-6.2.6 version of WeChat was infected by malware due to its developers having accidentally downloaded "XcodeGhost" instead of Xcode. Additionally, we don't know what Tencent itself does with the information WeChat can read, so it's probably best to avoid storing things like company-confidential documents on the same device, just in case.

    Disclaimer: The notes on this page are provided in the hope that they are useful, but they are not official instructions and may contain mistakes. Your use of them is at your own risk.

    All material © Silas S. Brown unless otherwise stated.