Voice messages are convenient in the moment, but they are hard to search later. Transcribing them turns voice messages into a readable, searchable timeline that you can summarize and share.
WhatsApp voice message transcription solves a problem that grows with every group chat. A busy family group, a project team, or a community channel can accumulate dozens of voice messages in a single day. Replaying each one sequentially is slow, and there is no native search across audio. Converting those clips to text changes the medium entirely: spoken words become indexable, quotable, and shareable alongside the typed parts of the conversation.
WhatsApp encodes voice messages differently depending on the device used to record them. On Android, voice messages are stored as .opus files, a format optimised for low-bitrate speech. On iOS, they are stored as .m4a files. Both formats carry the audio data that ThreadRecap needs, but understanding this distinction matters when you are troubleshooting an export or verifying that your audio files are present in the downloaded .zip.
When you export a WhatsApp chat, you must choose between "with media" and "without media." The "without media" option omits all attachments, which means every voice message in the conversation is excluded from the export entirely. To get audio files in the .zip, you must select the "with media" option. This single setting is the most common reason people find that their transcripts contain no voice message content.
How the transcription works
ThreadRecap uses OpenAI's audio transcription API as its transcription engine, asking for segment-level timestamps when the recap needs timings inside a single clip. Accuracy is highest on clear audio recorded in quiet conditions, and holds up across a wide range of accents and speaking styles, though it can drop when there is significant background noise, when the speaker is far from the microphone, or when the message was recorded in a noisy environment such as a moving vehicle or a crowded room.
The API handles the audio formats WhatsApp produces without any manual conversion step on your part. You upload the exported .zip to ThreadRecap, and the pipeline extracts the .opus or .m4a files, passes them through transcription, and returns text aligned to each message. You do not need to install any local software or convert files yourself.
What gets excluded and why
Not every voice message in a chat can be transcribed. WhatsApp's view-once voice messages are designed to disappear after a single playback, and they are excluded from chat exports entirely. Because the audio file is never written to the export package, ThreadRecap has no audio to process. If you notice that a specific voice message from a conversation is missing from your transcript, it was most likely sent as a view-once message. This is a WhatsApp platform constraint, not a limitation of the transcription tool.
Best practices for clean transcripts
Export the chat with media so audio files are included.
Keep the .zip intact to preserve timestamps and ordering.
The export process itself takes only a few taps, but the "with media" option is essential. Inside a WhatsApp chat, tap the three-dot menu on Android or the contact or group name on iOS, then choose "Export Chat." When the prompt appears asking whether to include media, select "Include Media." WhatsApp will package the conversation history and all attached audio files into a single .zip archive. For long group chats, this file can be several hundred megabytes or more, so exporting over Wi-Fi is advisable.
ThreadRecap supports uploads up to 2 GB and can handle chats of 75,000 messages or more. This means even large, long-running group chats with hundreds of voice messages are within scope. You do not need to split the export or remove files before uploading.
Preserving the timeline with an intact .zip
WhatsApp embeds timestamps in the chat export text file, and each audio filename follows a naming convention that encodes the date and time of the original message. Keeping the .zip archive intact rather than extracting and re-zipping it preserves this structure. ThreadRecap reads both the chat log and the audio filenames to align each transcript with the correct point in the conversation timeline. If you rename audio files or reorganise the folder before re-zipping, the alignment can break, and transcripts may be attached to the wrong messages.
Once the alignment is intact, the resulting transcript mirrors the original chat chronology. You can scroll through a conversation and see typed messages and voice message transcripts interleaved in the order they were sent, which makes it straightforward to follow the thread of a discussion that mixed both communication styles.
Recording conditions that improve accuracy
Because transcription accuracy is sensitive to audio quality, a few recording habits make a noticeable difference. Voice messages recorded in quiet rooms with the phone held close to the mouth consistently produce cleaner transcripts than those recorded on speaker in an open office or outdoors on a windy day. If you are using WhatsApp audio transcription for something consequential, such as capturing decisions from a remote team standup or documenting a client briefing, asking participants to record in quieter conditions will improve the output without any changes to the transcription pipeline itself.
WhatsApp voice message transcription also handles multilingual chats better than many people expect. Transcription covers a wide range of languages, so a group chat where some members write and speak in English and others in Spanish or French will generally produce usable transcripts for each language segment, rather than failing silently on non-English audio.
Summaries that include voice context
Once voice messages are converted to text, they become part of the analysis. You can generate a recap that includes spoken ideas, not just typed messages.
How voice transcripts integrate with summaries
ThreadRecap treats transcribed voice messages as first-class text once they have been processed. They are included in the full-text index alongside typed messages, which means a summary generated from the chat will draw on spoken content as well as written content. If a team member sent a three-minute voice message outlining the plan for a project, that plan will appear in the summary rather than being invisible because it was audio rather than text.
This matters practically because important decisions and nuanced ideas often end up in voice messages rather than typed messages. People reach for voice when they want to explain something complex, when they are driving, or when typing would take too long. Treating those messages as unsearchable audio means losing a significant portion of the actual conversation. Bringing them into the text layer makes the summary a complete record rather than a partial one.
Searching across a transcribed chat
Once voice messages are transcribed, the resulting text is searchable within the ThreadRecap interface. You can search for a specific phrase, a person's name, a project term, or a date mentioned in conversation, and results will surface both typed messages and voice message transcripts that contain that term. For group chats where voice messages are common, this can reduce the time needed to locate a specific piece of information from several minutes of audio scrubbing to a few seconds of text search.
The search capability is particularly useful for long-running group chats that have accumulated months or years of history. A chat with 75,000 messages and hundreds of voice messages becomes navigable in a way that the native WhatsApp interface does not support, because WhatsApp's own search does not index audio content.
Generating a voice-aware WhatsApp audio transcript summary
After transcription, you can ask ThreadRecap to produce a summary that covers the full conversation, including the spoken portions. The summary engine considers all text in the timeline, so a voice message that contains a key decision or an action item will be represented in the output. The result is a structured recap that you can share with someone who was not in the group chat, or store as a record of what was discussed and agreed.
For teams that use WhatsApp for project coordination, this workflow effectively turns an informal messaging channel into a documented record. The combination of WhatsApp voice message transcription and summarisation means that even a fast-moving, voice-heavy conversation leaves behind a searchable, readable artefact.
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