Cut Audio for Instagram, YouTube, WhatsApp and Telegram

Social platforms and messengers all want audio in a particular shape: short for Reels and Shorts, with timestamps for YouTube, under some size for a chat. This guide collects the four jobs people ask about most, with the steps that work today. Everything runs in your browser.

A clip for Instagram Reels, YouTube Shorts and TikTok

Short-form video lives on the first three seconds, so the clip has to start on the line that matters, not on a breath before it.

1. Open Cut a section and load the episode, song or voice memo.
2. Drag the handles around the moment, or type the times. 15 to 60 seconds suits most clips.
3. Press Trim silence at both ends, then Play selection to check the first and last word.
4. Save, and drop the file into CapCut, Instagram's own editor or any video app as the sound track.

The free download is WAV, which every video editor accepts. With Pro an MP3 or M4A source stays in its own format, frame-exact, which is smaller to send to your phone.

Highlight clips from a podcast episode

A one-hour episode usually holds five to ten moments that stand alone: one question and its answer, one story, one strong opinion. Note their times while you listen, then cut each with Cut a section; ticking also save the parts before and after is handy when two highlights follow each other. To shorten a clip without changing what is said, run it through Remove pauses first: it tightens the gaps and keeps every word. Add captions in your video editor; most people watch with the sound off.

YouTube chapters from timestamps

YouTube builds chapters from timestamps in the video description. Google's rules for them:

• The first timestamp is 0:00.
• There are at least three timestamps, in ascending order.
• Each chapter is at least 10 seconds long.

0:00 Intro
2:15 Why we started
11:40 The first year
24:05 Questions from listeners

To find the times, load the audio in Cut a section and move a handle along the waveform: the start field shows the exact time of each topic change. You do not need to split the file for chapters; YouTube does that in the player.

Long recordings over WhatsApp and Telegram

Voice messages are made for short notes. A lecture, an interview or a rehearsal is better sent as a file: in WhatsApp through the attachment button → Document, in Telegram through the paperclip → File. Both apps then send the recording unchanged instead of compressing it.

If a file is still too big, for the app, for a group's settings or for the recipient's data plan, split it: open the splitter, choose MB per part, enter the size that works, and send the parts in order. Smart split puts each cut in a pause, so nobody hears half a word at the start of part 2. The numbered file names keep the order clear in the chat.

Which format to send

Job	Format	Why
Sound track for a video editor	WAV or the original	Full quality; the editor compresses once at export
Clip sent to a phone	MP3 or M4A	A tenth of the size of WAV
Long recording in a chat	The original MP3 or M4A, split by size if needed	No re-encoding, smallest file

Questions

How long should an audio clip for Reels or Shorts be?

15 to 60 seconds works for most clips. Start on the line that matters; the first three seconds decide whether people keep watching.

How do I add chapters to a YouTube video?

Put timestamps in the video description: the first at 0:00, at least three in ascending order, each chapter at least 10 seconds long.

How do I send a long audio recording on WhatsApp?

Send it as a document through the attachment button, not as a voice message. If it is too large, split it by size first and send the parts in order.

Is my audio uploaded when I cut it?

No. ChunkAudio works inside your browser; the file never leaves your device.