The five-minute ceiling people hit when they try to send audio in Slack belongs to clips, not to audio files. Record inside Slack and you get five minutes. Upload the same recording as a file and the documented constraint is size — 1GB — with no duration limit stated anywhere in Slack's help center.
Two features, two rule sets — mixing them up is why "Slack won't let me send a 40-minute interview" is such a common complaint. It will. Just not with the record button.
Before you start
Three things worth knowing before you touch anything:
- The audio has to already exist as a file. If the recording only lives inside a phone app, export it first.
- Know whether the destination is a Slack Connect conversation. Slack says so up front: "Uploading and sharing files may be restricted for Slack Connect conversations, and certain file types can't be added at all."
- Know whether the workspace is on the free plan. That does not change whether the upload succeeds, only how long the file survives afterwards.
Clip versus file upload: the difference that matters
Slack's own wording for clips: "Share audio and video clips up to five minutes long in Slack to communicate easily with your team, regardless of their time zone or location." That feature is available to "All members and guests" and "Available on all plans" — it is not a paid perk you can buy your way past.
An ordinary file upload is governed by a different sentence entirely: "You can add files up to 1GB in size."
| Clip recorded in Slack | Audio uploaded as a file | |
|---|---|---|
| Duration limit | "up to five minutes long" | Not stated in Slack's documentation |
| Size limit | Not stated separately | "up to 1GB in size" |
| Who can use it | "All members and guests", "Available on all plans" | Anyone who can post files in that conversation |
| Retention | "Clips follow the same retention policy as other files in Slack" | Same file retention rules |
The two blank cells are honest rather than lazy: Slack publishes no duration cap for uploaded audio files, and no separate size figure for clips.
Note also what the 1GB figure does not come with — there is no table on that help page giving Pro, Business+ or Enterprise+ a higher per-file ceiling; the sentence is unconditional. To find out whether your plan differs, check the official documentation rather than a blog, this one included.
Step 1: check the length, then pick your route
Under five minutes, a clip is fine. Anything longer goes up as a file, and there is no "extended clip" setting to hunt for. Slack's clip documentation lists "Upload an existing video as a clip" as an option, but it does not state what formats, sizes or durations that path accepts — so do not plan a 40-minute recording around it.
Step 2: check the file size, not the app
Slack's help center does not state whether it re-compresses what you upload, or whether the 1GB check is applied before or after any such processing. If a recording is near the line, check the official documentation rather than assuming either behaviour.
If the upload is rejected, size may not even be the reason. Slack's developer documentation defines a distinct file_upload_size_restricted error — "The size of provided file is too large, as the team has restricted uploads of large files" — which means your workspace can be configured stricter than 1GB. The same error table carries storage_limit_reached, described as "File storage limit has been reached. This occurs when free teams have uploaded 5GB of files." That 5GB is a whole-workspace total from developer docs — not a per-file cap, and not a figure the current user-facing help pages repeat.
Step 3: convert it if the format or the size is awkward
Slack's API assigns filetype labels to audio it recognises, including m4a ("MPEG 4 audio"), wav ("Waveform audio") and ogg ("Ogg Vorbis"). Read that for what it is: a labelling enum in developer documentation, not a published list of formats Slack will play inline in a message. Slack's help center does not state which audio formats get an in-message player.
If you want a different format before uploading, convert it first.
Try it right here
Runs in your browser. Your file is not uploaded anywhere.
It runs inside your browser tab: the file is converted locally, with nothing uploaded to a server. WAV to MP3 does the same for recorder output, and if the audio is trapped inside a video file, extract audio from video pulls the track out. All Clapr tools covers the rest.
Step 4: upload it
Slack documents the desktop path: "Drag and drop up to 10 files into the Slack message field, or click the plus icon next to the message field and choose files to add."
One detail there is easy to skim past: the sentence says "up to 10 files" in a single drag, but Slack does not state whether that is a hard cap, and it publishes no total-size ceiling for one message — only the per-file 1GB figure.
Step 5: check it survived the trip
Uploads also fail for reasons unrelated to size. Slack scans what you send: "Files you add to Slack will be scanned for viruses and other malware, and won't be uploaded if any are detected." Free workspaces are also subject to an unquantified throughput rule — Slack says you "may be prevented from sending too many messages or files in a short period of time", and attaches no number to it.
In Slack Connect channels and DMs, check the file went through. Slack publishes a list of extensions that cannot be added there, and .7z, .gz and .tar are on it — so the instinct to archive audio before sending it to an external partner is exactly what gets it blocked. That list applies to Slack Connect specifically, not to every channel in your workspace.
Common mistakes
Trying to stretch a clip instead of uploading a file. Five minutes is a documented, all-plans limit on clips. Upgrading does not move it.
Assuming teammates can save it on their phone. Slack is blunt about this: "On your mobile device, you can only download image files."
Expecting a shareable link on a free workspace. "If your workspace is on a paid plan, you can create links to share files outside of Slack." Even then the permissions differ by channel type: "In a public channel, any member can create an external link for a file. In a private channel, only the person who uploaded the file can create an external link for it."
Treating Slack as the archive. On the free plan you can view and search messages and files from the last 90 days, older content gets hidden to make room, and "Messages and files more than one year old will be permanently deleted." Clips are not exempt — they follow the same retention policy as other files. And the hiding is not always reversible: if a Workspace Owner has set retention to "delete them after 90 days", hidden content is deleted rather than waiting for an upgrade. Keep the master copy somewhere you control. More on that in Slack's free plan storage limit.
FAQ
Can you send audio longer than 5 minutes on Slack? Yes, but not as a clip. The five-minute limit applies to audio and video clips, on all plans. Uploaded as an ordinary file, the documented constraint is the 1GB per-file size limit — Slack states no duration cap.
What is the max audio file size on Slack?
Slack's help center states "You can add files up to 1GB in size", with no plan conditions attached. Your own workspace may be configured stricter: Slack's API has a separate file_upload_size_restricted error for teams that have restricted large uploads.
What audio formats does Slack support?
Slack's developer documentation labels file types including m4a, wav and ogg, but that is a type-labelling list rather than a published playback whitelist, and the help center does not state which formats play inline in a message. Whether a given file gets an in-message player is something to check in your own workspace.
Why can't I download an audio file from Slack on my phone? Because Slack documents that path as image-only: "On your mobile device, you can only download image files." Open the message on a desktop client to save the file.
How long does an audio file stay on Slack? On the free plan, the last 90 days are visible and searchable; content past that starts getting hidden, and anything more than one year old is permanently deleted. Slack is clear that deletion is final: "It will not be possible to restore messages and files once deletion occurs." Slack describes "the remaining 275 days" becoming available should you upgrade — but only if the content still exists. Workspace Owners can "either keep all messages and files for one year, or delete them after 90 days", and on the second setting "this will automatically delete any that become hidden by the message and file limit". Configured that way, upgrading brings nothing back.
Quotes from Slack's help center (adding files, audio and video clips, free-workspace usage limits, restricted file types in Slack Connect) and from the files.getUploadURLExternal reference in Slack's developer documentation, checked 16 September 2026. Slack revises these pages — verify before relying on them. More guides live in the how-to hub, and the numbers behind this one are collected in Slack's file upload limit.
